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UUNDAJI WA MANENO- MASWALI YA UMAHIRI PAMOJA NA MAJIBU YAKE | KIDATO CHA NNE

Uundaji wa Maneno – Kiswahili Kidato cha Nne

Haya ni maswali 15 ya umahiri (Competence-Based Questions) pamoja na majibu yake.

1. Eleza maana ya uundaji wa maneno na taja njia nne zinazotumika kuunda maneno katika Kiswahili.

Jibu: Uundaji wa maneno ni mchakato wa kupata maneno mapya katika lugha kwa kutumia mbinu mbalimbali. Njia hizo ni: i. Unyambulishaji
ii. Uambishaji
iii. Urudufishaji
iv. Ukopaji

2. Mwanafunzi alikutana na maneno “mchezaji, mpishi na mwandishi”. Eleza jinsi maneno hayo yalivyoundwa.

Jibu: Maneno hayo yameundwa kwa unyambulishaji ambapo mzizi wa neno huongezewa viambishi ili kupata neno lenye maana mpya. “Mchezaji” limetokana na cheza, “mpishi” limetokana na pika, na “mwandishi” limetokana na andika.

3. Tofautisha kati ya unyambulishaji na uambishaji kwa kutoa mifano miwili kwa kila moja.

Jibu: Unyambulishaji ni mchakato wa kuongeza viambishi kwenye mzizi ili kubadili maana au aina ya neno, kwa mfano soma → msomaji na cheza → mchezaji. Uambishaji ni kuongeza viambishi kwenye neno ili kuonyesha mambo kama nafsi, wakati, hali au ukanushi, kwa mfano anasoma na hatusomi.

4. Chunguza sentensi ifuatayo: “Wakulima walilima mashambani kwa bidii.” Eleza maneno mawili yaliyoundwa kwa kuongeza viambishi.

Jibu: Neno wakulima limeundwa kutokana na kulima kwa kuongeza kiambishi wa- kinachoonyesha wingi wa watu. Neno walilima limeundwa kwa kuongeza viambishi wa- na -li- kwenye mzizi lim, ambapo wa- huonyesha nafsi ya tatu wingi na -li- huonyesha wakati uliopita.

5. Eleza jinsi urudufishaji unavyoweza kutumika katika uundaji wa maneno. Toa mifano mitatu.

Jibu: Urudufishaji ni kurudia neno au sehemu ya neno ili kuunda neno lenye maana maalumu. Mifano ni polepole, harakaharaka na kidogokidogo.

6. Maneno yafuatayo yametokana na lugha nyingine: “shule, meza, safari na kitabu”. Eleza njia iliyotumika kuyaingiza katika Kiswahili.

Jibu: Maneno hayo yamepatikana kwa njia ya ukopaji. Kiswahili hukopa maneno kutoka lugha nyingine kutokana na mwingiliano wa jamii, biashara, elimu, dini na shughuli nyingine. Maneno hayo yamebadilishwa au kutumika kulingana na mfumo wa Kiswahili.

7. Jamii imeanza kutumia neno “kompyuta” kutokana na maendeleo ya teknolojia. Eleza umuhimu wa ukopaji katika kukuza msamiati wa Kiswahili.

Jibu: Ukopaji huwezesha Kiswahili kupata maneno mapya yanayohusiana na teknolojia, sayansi, biashara na nyanja nyingine. Pia husaidia lugha kukabiliana na maendeleo ya jamii na kuongeza msamiati unaohitajika katika mawasiliano.

8. Unda maneno mawili mapya kutokana na kila mzizi ufuatao: “som”, “chez” na “andik”.

Jibu: Kutokana na mzizi som tunapata msomaji na somesha. Kutokana na chez tunapata mchezaji na mchezo. Kutokana na andik tunapata mwandishi na andika.

9. Eleza maana ya kutohoa maneno na toa mifano mitatu ya maneno yaliyotoholewa katika Kiswahili.

Jibu: Kutohoa ni kubadilisha neno kutoka lugha nyingine ili liendane na matamshi na mfumo wa Kiswahili. Mifano ni shule, meza na kompyuta.

10. Mwalimu aliwaambia wanafunzi watengeneze maneno kutokana na neno “soma”. Taja maneno manne yanayoweza kupatikana.

Jibu: Maneno yanayoweza kupatikana ni msomaji, usomaji, somesha na kusoma.

11. Eleza namna ambavyo viambishi vinaweza kusaidia kubadili maana ya neno.

Jibu: Viambishi vinapoongezwa kwenye mzizi vinaweza kubadili maana au matumizi ya neno. Kwa mfano, mzizi lim unaweza kutoa kulima, mkulima, kilimo, limisha na limwa. Hivyo, viambishi husaidia kuunda maneno yenye maana na matumizi tofauti.

12. Tunga sentensi zinazoonyesha matumizi ya maneno yaliyoundwa kutokana na mzizi “chez”.

Jibu:
i. Mchezaji wetu alifunga bao la ushindi.
ii. Watoto walifanya mchezo uwanjani.
iii. Mwalimu aliwaambia watoto kucheza kwa utaratibu.

13. Kwa nini lugha huhitaji kuendelea kuunda maneno mapya?

Jibu: Lugha huhitaji kuunda maneno mapya ili kukidhi mahitaji mapya ya jamii. Maendeleo katika sayansi, teknolojia, elimu, uchumi na utamaduni huleta dhana mpya zinazohitaji majina. Uundaji wa maneno pia husaidia lugha kukua na kuwa na uwezo wa kueleza mambo mbalimbali.

14. Mwanafunzi amesema kuwa neno “mwalimu” limetokana na mzizi “lim”. Je, kauli hii ni sahihi? Eleza.

Jibu: Kauli hiyo si sahihi. Neno mwalimu linahusiana na mzizi alim kutoka katika kitenzi alima, na limeundwa kwa mchakato wa unyambulishaji. Hivyo, si sahihi kulichanganua moja kwa moja kama lim → mwalimu bila kuzingatia muundo wake.

15. Shule yako imeanzisha somo la teknolojia na wanafunzi wameanza kutumia maneno mengi mapya. Eleza njia tatu ambazo Kiswahili kinaweza kutumia kupata msamiati wa teknolojia.

Jibu: Kiswahili kinaweza kupata msamiati wa teknolojia kwa ukopaji, ambapo maneno kutoka lugha nyingine huchukuliwa na kutoholewa; kwa unyambulishaji, ambapo maneno mapya huundwa kwa kutumia mizizi na viambishi vya Kiswahili; na kwa utohoaji/ubunifu wa istilahi, ambapo wataalamu huunda maneno yanayoeleza dhana mpya kwa kutumia rasilimali za Kiswahili.

SOIL CHEMISTRY- COMPETENCE BASED ESSAY QUESTIONS WITH ANSWERS

 

SOIL CHEMISTRY – FORM FOUR

Competence-Based Questions with Answers

Question 1

A farmer notices that crops growing in one part of the farm are not growing well because the soil is too acidic. Explain five ways in which soil acidity can be reduced.

Answer:
i. Apply lime such as calcium carbonate (CaCO₃) to neutralize excess acidity.
ii. Apply wood ash, which contains basic substances that can reduce soil acidity.
iii. Add organic manure to improve soil properties and help buffer soil pH.
iv. Avoid excessive use of fertilizers that increase soil acidity.
v. Test the soil regularly and apply suitable materials according to the soil-test results.

Question 2

A farmer wants to determine whether the soil in his farm is acidic, neutral or alkaline. Describe three methods that can be used to determine soil pH.

Answer:
i. Use a pH meter to measure the hydrogen ion concentration and obtain the pH value.
ii. Use universal indicator and compare the colour produced with a standard pH colour chart.
iii. Use pH indicator paper and compare its colour change with the given pH scale.

Question 3

Explain six importance of soil pH in agricultural production.

Answer:
i. It determines the availability of essential mineral nutrients to plants.
ii. It influences the activities of microorganisms responsible for decomposition and nutrient cycling.
iii. It affects the solubility of different minerals and chemical compounds in the soil.
iv. It influences the growth and development of crops.
v. It affects the efficiency and effectiveness of some fertilizers.
vi. It helps farmers to select crops that are suitable for particular soil conditions.

Question 4

A farmer applies ammonium fertilizer continuously and notices that the soil becomes more acidic. Explain how excessive use of some fertilizers can cause soil acidity.

Answer:
i. Some ammonium fertilizers undergo nitrification in the soil.
ii. During nitrification, hydrogen ions (H⁺) are released.
iii. The increase in hydrogen ions lowers the soil pH.
iv. Continuous application of such fertilizers can therefore make the soil increasingly acidic.

Question 5

Different soil samples have pH values of 4, 7 and 9. Classify each soil sample and explain the meaning of each value.

Answer:
i. pH 4: The soil is acidic because it has a relatively high concentration of hydrogen ions (H⁺).
ii. pH 7: The soil is neutral because the concentrations of H⁺ and OH⁻ ions are approximately equal.
iii. pH 9: The soil is alkaline because it has a relatively higher concentration of hydroxide ions (OH⁻).

Question 6

Explain five effects of highly acidic soils on crop production.

Answer:
i. Essential nutrients such as phosphorus may become less available to plants.
ii. Toxic concentrations of aluminium and manganese may develop in the soil.
iii. Root growth may be restricted.
iv. The activities of beneficial soil microorganisms may be reduced.
v. Poor nutrient availability and toxicity may lead to reduced crop growth and yield.

Question 7

A farmer adds calcium carbonate to acidic soil. Explain the chemical importance of this practice.

Answer:
i. Calcium carbonate reacts with hydrogen ions present in acidic soil.
ii. The reaction reduces the concentration of hydrogen ions.
iii. The soil pH therefore increases towards neutrality.
iv. A simplified reaction is CaCO₃ + 2H⁺ → Ca²⁺ + CO₂ + H₂O.
v. Liming can therefore create more favourable chemical conditions for crop growth.

Question 8

Explain five ways organic matter improves the chemical properties of soil.

Answer:
i. It supplies nutrients to plants when organic matter decomposes.
ii. It increases the soil's ability to retain nutrient ions.
iii. It improves the availability of some mineral nutrients.
iv. It helps to buffer sudden changes in soil pH.
v. It provides favourable conditions for microorganisms involved in nutrient cycling.

Question 9

A farmer uses large amounts of chemical fertilizers without following recommended application rates. Explain five possible chemical effects on the soil.

Answer:
i. The soil may become excessively acidic.
ii. Soluble salts may accumulate in the soil.
iii. An imbalance of nutrients may develop.
iv. Some nutrients may become chemically unavailable to plants.
v. Excess nutrients may be leached into groundwater and other water sources.

Question 10

Explain the importance of nitrogen, phosphorus and potassium (NPK) in soil fertility.

Answer:
i. Nitrogen: It promotes vegetative growth and is essential for the formation of proteins and chlorophyll.
ii. Phosphorus: It promotes root development and plays an important role in energy transfer in plants.
iii. Potassium: It helps regulate water balance, improves plant strength and supports resistance to some stresses.

Question 11

A soil sample contains very little nitrogen. Predict five effects this may have on plants.

Answer:
i. Plants may show stunted or poor growth.
ii. Older leaves may become pale or yellow.
iii. Protein formation may decrease.
iv. Plants may develop small leaves and weak stems.
v. Crop production and yield may decrease.

Question 12

Explain five causes of soil alkalinity in agricultural areas.

Answer:
i. Accumulation of basic salts in the soil can increase alkalinity.
ii. Irrigation with water containing high concentrations of dissolved salts can contribute to alkalinity.
iii. Poor drainage can cause salts to accumulate near the soil surface.
iv. Weathering of alkaline parent rocks can release basic minerals into the soil.
v. Excessive application of certain alkaline materials can increase soil pH.

Question 13

A student adds a small amount of soil to distilled water, shakes the mixture and filters it before testing the filtrate with universal indicator. Explain why these steps are performed.

Answer:
i. Distilled water is used to avoid adding ions that could interfere with the pH test.
ii. Shaking allows soluble substances in the soil to dissolve into the water.
iii. Filtration removes insoluble soil particles from the mixture.
iv. Testing the filtrate allows the pH of the soil solution to be determined.

Question 14

Explain five methods of maintaining soil fertility using knowledge of soil chemistry.

Answer:
i. Apply appropriate fertilizers to replace nutrients removed by crops.
ii. Use organic manure to add nutrients and organic matter to the soil.
iii. Apply lime to acidic soils when soil testing indicates that liming is necessary.
iv. Practice crop rotation to reduce continuous depletion of particular nutrients.
v. Conduct soil testing before applying fertilizers and soil amendments.

Question 15

A farmer discovers that phosphorus fertilizer applied to his acidic soil is not giving the expected results. Explain why soil pH can affect phosphorus availability.

Answer:
i. In strongly acidic soils, phosphorus can react with iron and aluminium compounds.
ii. These reactions may produce compounds that are less soluble.
iii. The phosphorus becomes less available for absorption by plant roots.
iv. Correcting excessive soil acidity can improve phosphorus availability.
v. Soil testing helps determine the appropriate treatment before applying fertilizers.

Human Population- Competence-Based Essay Questions with Answers | Form 4

 

HUMAN POPULATION – FORM FOUR GEOGRAPHY

Competence-Based Essay Questions with Answers

Questions 1–15

Question 1

A country has experienced a rapid increase in population during the last twenty years. Explain five factors that may have contributed to this population increase. Answer: i. High birth rate due to early marriages and preference for large families. ii. Decline in death rate due to improved medical services. iii. Improvement in food production, leading to better nutrition. iv. Improvement in sanitation and availability of clean water. v. Immigration of people from other countries or regions.

Question 2

The government of a developing country is concerned about the effects of rapid population growth. Explain six problems that may result from rapid population growth. Answer: i. Unemployment increases because job opportunities may not increase at the same rate as population. ii. Pressure on land may lead to land fragmentation and overuse. iii. Shortage of social services such as schools, hospitals and housing. iv. Food shortages may occur when food production cannot meet demand. v. Environmental degradation may increase through deforestation and overcultivation. vi. Poverty may increase because available resources are shared among many people.

Question 3

A district has a population of 240,000 people and an area of 6,000 km². Calculate its population density and explain what the result means. Answer: Population density = Population ÷ Area = 240,000 ÷ 6,000 = 40 people per km² This means that, on average, there are 40 people living in every square kilometre of the district.

Question 4

Many young people are moving from rural areas to towns in search of better living conditions. Explain six factors that encourage rural–urban migration. Answer: i. Availability of employment opportunities in urban areas. ii. Better educational facilities in towns. iii. Availability of better medical services. iv. Higher wages and income opportunities. v. Better transport and communication facilities. vi. Availability of modern social and recreational facilities.

Question 5

A rapidly growing town is experiencing overcrowding, unemployment and pressure on social services. Suggest six measures that the government can take to control these problems. Answer: i. Develop industries and businesses in rural areas. ii. Improve rural social services such as schools and hospitals. iii. Create employment opportunities in rural areas. iv. Improve transport and communication networks in rural areas. v. Promote family planning and population education. vi. Establish proper urban planning and affordable housing programmes.

Question 6

Population distribution in Tanzania is uneven. Explain six factors responsible for differences in population distribution. Answer: i. Availability of fertile soils attracts people for agriculture. ii. Reliable rainfall encourages settlement and farming. iii. Availability of water attracts people for domestic and economic activities. iv. Areas with mineral resources attract workers and investors. v. Availability of employment opportunities attracts people. vi. Good transport networks encourage settlement and economic activities.

Question 7

A region has a large proportion of children and young people compared with adults. Explain five possible effects of such a population structure on development. Answer: i. High dependency burden because many children depend on the working population. ii. Increased demand for schools and teachers. iii. Increased demand for health services. iv. The government may spend more money providing basic services for children. v. If properly educated and employed, the young population can provide a large future labour force.

Question 8

A country wants to reduce its high population growth rate without violating people's rights. Explain six appropriate measures it can use. Answer: i. Provide family planning education and services. ii. Encourage girls' and women's education. iii. Promote delayed marriages. iv. Improve access to reproductive health information. v. Encourage families to adopt responsible family sizes. vi. Improve economic opportunities for women to reduce excessive dependence on large families.

Question 9

Explain six positive contributions of a large population to the economic development of a country. Answer: i. Provides a large labour force for economic activities. ii. Creates a large market for goods and services. iii. Encourages expansion of industries to meet increased demand. iv. Provides a larger tax base when people are employed. v. Encourages development of infrastructure and social services. vi. Increases the potential number of skilled workers and professionals.

Question 10

A country has a very low population growth rate and an increasing number of elderly people. Explain five challenges that the country may face. Answer: i. Shortage of labour force in some economic sectors. ii. Increased expenditure on pensions and elderly care. iii. Increased demand for health services for older people. iv. Reduced working population may lower government revenue. v. Economic growth may slow down because of a smaller active labour force.

Question 11

A population census is conducted in a country every ten years. Explain six reasons why population census is important for national development. Answer: i. Helps the government to know the total population of the country. ii. Provides information about population distribution. iii. Helps in planning schools, hospitals and other social services. iv. Helps the government to allocate resources to different areas. v. Provides information about the size and characteristics of the labour force. vi. Helps in planning development projects and policies.

Question 12

A region has a high death rate compared with other regions. Explain six factors that may contribute to the high death rate. Answer: i. Poor medical and health services. ii. Frequent outbreaks of diseases. iii. Poor sanitation and unsafe drinking water. iv. Food shortages and malnutrition. v. High levels of poverty. vi. Natural disasters, conflicts or accidents that cause loss of life.

Question 13

A developing country is experiencing rapid population growth and limited resources. Explain six ways population growth can affect the environment. Answer: i. Deforestation may increase due to demand for farmland and settlement. ii. Overcultivation may lead to soil exhaustion. iii. Overgrazing may cause land degradation. iv. Increased waste production may cause pollution. v. Wetlands and other natural habitats may be destroyed. vi. Increased demand for water may cause water shortages and degradation of water sources.

Question 14

A government wants to improve the quality of life of its population. Explain six measures it can take to improve population welfare. Answer: i. Improve access to quality education. ii. Provide accessible and affordable health services. iii. Create employment opportunities. iv. Improve access to clean and safe water. v. Provide adequate and affordable housing. vi. Improve transport, communication and other basic infrastructure.

Question 15

A country has experienced a large number of people entering from neighbouring countries. Explain five possible effects of immigration on the receiving country. Answer: i. Immigration can increase the available labour force. ii. It can increase demand for land, housing and social services. iii. It can increase the market for goods and services. iv. It may increase government expenditure on public services. v. It can promote cultural exchange and the sharing of skills and knowledge.

Non Metals And Their Compounds | Competence Based Questions With Answers | Form Four

 

FORM FOUR CHEMISTRY: NON-METALS AND THEIR COMPOUNDS

15 Competence-Based Questions with Answers

1. Chlorine is widely used in the treatment of drinking water.

(a) Explain why chlorine is added to drinking water.
(b) Mention one disadvantage of using excess chlorine in water.

Answer:
(a) Chlorine is added to kill harmful microorganisms such as bacteria and viruses.
(b) Excess chlorine can give water an unpleasant taste and may form harmful compounds.

2. A student passes chlorine gas through moist blue litmus paper.

What observations would you expect?

Answer:
The blue litmus paper first turns red and then becomes bleached/white.

3. Hydrogen chloride gas is prepared in the laboratory by reacting sodium chloride with concentrated sulphuric acid.

(a) Write the balanced chemical equation.
(b) Why is the gas not collected over water?

Answer:
(a)
NaCl + H₂SO₄ → NaHSO₄ + HCl

(b) Hydrogen chloride is highly soluble in water, so it cannot be collected over water.

4. Carbon dioxide is produced when calcium carbonate reacts with dilute hydrochloric acid.

(a) Write the balanced equation.
(b) State one test for carbon dioxide.

Answer:
(a)
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

(b) Bubble the gas through limewater. Limewater turns milky.

5. A farmer discovers that the soil on his farm is too acidic. Explain how a compound of a non-metal can be used to help solve this problem.

Answer:
Calcium carbonate can be added to the soil. It reacts with acids and neutralizes the acidity, raising the soil pH.

6. Sulphur dioxide is released into the atmosphere from industries and burning fuels.

(a) State the environmental problem associated with sulphur dioxide.
(b) Explain how it occurs.

Answer:
(a) It contributes to acid rain.
(b) Sulphur dioxide reacts with oxygen and water in the atmosphere to form acidic substances such as sulphuric acid.

7. A student burns sulphur in air and collects the gas produced.

(a) Name the gas formed.
(b) Give one physical property of the gas.

Answer:
(a) Sulphur dioxide (SO₂).
(b) It is a colourless gas with a choking/pungent smell.

8. Ammonia is an important compound of nitrogen used in agriculture.

(a) Why is ammonia important to farmers?
(b) Give one fertilizer made from ammonia.

Answer:
(a) It is used to manufacture nitrogen fertilizers that supply nitrogen needed for plant growth.
(b) Ammonium nitrate / ammonium sulphate.

9. A student accidentally smells ammonia directly from a reagent bottle.

What is the correct laboratory practice that should have been followed?

Answer:
The student should not smell the gas directly. If instructed to identify the smell, the gas should be gently wafted towards the nose.

10. Nitrogen gas makes up a large proportion of air, but it does not readily support burning.

Explain why nitrogen is useful in food packaging.

Answer:
Nitrogen is relatively unreactive and does not readily react with food. It reduces oxidation and helps preserve food.

11. A candle is placed inside a container containing carbon dioxide. The flame goes out.

(a) Explain the observation.
(b) Give one use of this property of carbon dioxide.

Answer:
(a) Carbon dioxide does not support combustion and displaces oxygen around the flame.
(b) It is used in fire extinguishers.

12. During photosynthesis, green plants use carbon dioxide.

(a) Write the word equation for photosynthesis.
(b) Explain why carbon dioxide is important to plants.

Answer:
(a)
Carbon dioxide + Water → Glucose + Oxygen
(in the presence of light and chlorophyll)

(b) Carbon dioxide provides carbon used by plants to manufacture glucose.

13. A student adds dilute hydrochloric acid to a solution containing silver nitrate and observes a white precipitate.

(a) Name the precipitate formed.
(b) Write the ionic equation.

Answer:
(a) Silver chloride.
(b)
Ag⁺(aq) + Cl⁻(aq) → AgCl(s)

14. Hydrogen is considered a useful fuel because it produces water when it burns.

(a) Write the balanced equation for the combustion of hydrogen.
(b) State one advantage of hydrogen as a fuel.

Answer:
(a)
2H₂ + O₂ → 2H₂O

(b) Its combustion produces water and does not directly produce carbon dioxide.

15. A school laboratory has bottles labelled CO₂, H₂, O₂ and Cl₂, but the labels have fallen off. Suggest suitable tests that can be used to identify the gases.

Answer:

• CO₂: Turns limewater milky.
• H₂: Burns with a characteristic “pop” sound when tested carefully with a lighted splint.
• O₂: Relights a glowing splint.
• Cl₂: Bleaches moist litmus paper.

Growth - Competence Based Questions With Answers | Form Four

 

15 Competence-Based Questions with Answers

1. What is growth in living organisms?

Answer: Growth is the permanent and irreversible increase in the size, mass, and number of cells of an organism.

2. A farmer notices that a young plant becomes taller and develops more leaves after several weeks. Explain the biological processes responsible for these changes.

Answer: The increase in height and development of new leaves are results of growth. Growth occurs through cell division, followed by cell enlargement and differentiation. Cell division produces new cells, while enlargement increases their size and differentiation allows them to become specialized tissues.

3. Why is cell division important in the growth of organisms?

Answer: Cell division, particularly mitosis, produces new cells. The increase in the number of cells contributes to an increase in the size and mass of an organism. It also replaces old and damaged cells.

4. Two identical seedlings are planted under the same conditions. One is supplied with enough water while the other receives very little water. After two weeks, the first seedling has grown better. Explain why.

Answer: Water is essential for metabolic activities and maintaining cell turgidity. Adequate water allows normal cell expansion and metabolic processes, while water deficiency reduces these processes and therefore slows growth.

5. Explain why nutrients are important for plant growth.

Answer: Plants require mineral nutrients to manufacture proteins, enzymes, chlorophyll and other substances needed for growth. Nutrients also support cell division and the formation of new tissues.

6. Why does a plant growing in darkness usually have weak and elongated shoots?

Answer: In darkness, the plant cannot carry out photosynthesis effectively, so it produces insufficient food for normal growth. The shoot becomes unusually elongated, thin and weak as it grows towards a possible source of light.

7. Mention four factors that affect growth in human beings.

Answer:

i. Genetic factors
ii. Nutrition
iii. Hormones
iv. Diseases

8. Differentiate between growth and development.

Answer: Growth refers to a permanent and irreversible increase in the size, mass or number of cells of an organism. Development refers to progressive changes in the structure, function and abilities of an organism as it becomes mature.

9. A student wants to investigate the effect of water on the growth of seedlings. Describe how the experiment can be carried out.

Answer: The student should use two similar seedlings planted in similar containers containing equal amounts of soil. One seedling should receive adequate water while the other receives a limited amount. Other factors such as light, temperature and soil type should be kept constant. The height of each seedling should be measured regularly and the results compared.

10. Explain how temperature affects growth.

Answer: Temperature affects the activity of enzymes that control metabolic reactions. At very low temperatures, metabolic reactions become slow, reducing growth. At very high temperatures, enzymes may be denatured, also interfering with growth. Therefore, organisms grow best within a suitable temperature range.

11. Why is a balanced diet important for growth in human beings?

Answer: A balanced diet provides the nutrients required for building new tissues, repairing damaged tissues and supplying energy for metabolic activities. Proteins are particularly important for tissue formation and repair, while vitamins and minerals support normal body functions.

12. A child suffers from severe protein deficiency for a long period. Explain how this condition may affect the child's growth.

Answer: Protein deficiency reduces the body's ability to build and repair tissues. As a result, the child may experience stunted growth, poor muscle development and delayed physical development.

13. Mention four hormones that are associated with growth and development in humans.

Answer: i. Growth hormone
ii. Thyroxine
iii. Oestrogen
iv. Testosterone

14. A farmer removes the shoot tip of a young plant, and the plant later stops increasing in height. Explain this observation.

Answer: The shoot tip contains the apical meristem, which consists of actively dividing cells. These cells produce new cells that contribute to the increase in length of the shoot. Removing the shoot tip therefore reduces primary growth in length.

15. “All organisms grow throughout their entire lives.” Do you agree with this statement? Give reasons for your answer.

Answer: No, I do not completely agree. Growth patterns differ among organisms. Many animals reach a maximum size after attaining maturity, whereas plants can continue growing throughout their lives because they possess meristematic tissues capable of continuous cell division.

CYBER SECURITY- Competence-Based Questions with Answers | Form 2

15 Competence-Based Questions on Cyber Security with Answers For Form Two

1. A student receives an email asking him to click a link and enter his password. The email comes from an unknown person. What should the student do?
Answer: He should not click the link or provide his password. He should delete or report the email because it may be a phishing attack.

2. A student uses the password “123456” for all his online accounts. Explain why this is dangerous and suggest a better solution.
Answer: The password is very easy to guess. He should use a strong, unique password containing letters, numbers, and special characters, and use different passwords for different accounts.

3. A school computer suddenly becomes slow and displays unusual pop-up messages. What could be the problem, and what should be done?
Answer: The computer may be infected with malware. The user should disconnect it from the network, run updated antivirus/security software, and report the problem to the responsible technician.

4. Your friend wants to share your personal information, such as your phone number and home address, on social media. What advice would you give him?
Answer: I would advise him not to share personal information publicly because criminals can use it for identity theft, scams, or other attacks.

5. A student connects his phone to a free public Wi-Fi network at an airport. What security precautions should he take?
Answer: He should avoid accessing sensitive accounts such as banking services, use secure websites, disable automatic Wi-Fi connections, and use a trusted VPN where appropriate.

6. An employee leaves his computer unlocked when he goes for lunch. What cyber-security risk does this create?
Answer: Another person could access confidential information, modify files, install malicious software, or misuse the employee's account. The employee should always lock the computer when leaving it unattended.

7. A company stores important customer information on computers. Mention three measures the company can use to protect the information.
Answer: The company can use strong passwords and access controls, antivirus and firewall protection, regular data backups, encryption, and security updates.

8. A student downloads a free game from an unknown website, and after installing it, some files disappear. What might have happened?
Answer: The downloaded program may have contained malware, such as a virus or ransomware. The student should stop using the affected computer, disconnect it from the network, and report the incident.

9. Someone creates a social media account using your name and photographs without your permission. What type of cybercrime may this represent, and what should you do?
Answer: It may involve identity impersonation or identity theft. You should report the fake account, secure your real account, keep evidence such as screenshots, and report serious cases to the appropriate authorities.

10. A school wants to improve its cyber security. As a student, suggest five practices that can help protect the school's computers and information.
Answer: The school should use strong passwords, regularly update software, install antivirus and firewalls, back up important data, train students and staff about phishing and other cyber threats, and restrict access to sensitive information.

11. A student receives a message saying, “You have won 5,000,000 TZS! Send your bank details and password to claim your prize.” What should the student do?
Answer: The student should not provide any information or send money. The message is likely a scam/phishing attempt. He should delete it and report the sender.

12. A company employee notices that someone is repeatedly trying to log into his account using different passwords. What should he do?
Answer: He should immediately change his password to a strong one, enable two-factor authentication (2FA), inform the system administrator, and check whether the account has been compromised.

13. A student receives a USB flash drive from an unknown person and wants to connect it to a school computer. What should the student do before opening the files?
Answer: He should avoid using an unknown USB drive unless it has been verified. If it must be used, it should first be scanned with updated antivirus software to prevent malware infection.

14. Why is it important to regularly update the operating system and applications on a computer?
Answer: Updates often fix security weaknesses and vulnerabilities that attackers can exploit. Keeping software updated helps protect the computer from cyber attacks and malware.

15. A school computer contains examination results. Only authorized teachers should access the results. Suggest three security measures the school should use.
Answer: The school should use strong passwords, user access permissions, and encryption. It should also keep regular backups and ensure that only authorized users can access the examination results.