(x) Which of the following is a unicellular organism? A. Hydra B. Amoeba C. Earthworm D. Mushroom E. Fern

The following statements are either TRUE or FALSE. In the spaces provided write TRUE if the statement is correct and FALSE if the statement is not correct.

1. All bacteria are harmful to humans. (1 mk)
2. The liver produces bile for fat digestion. (1 mk)
3. Sponges belong to the Kingdom Plantae. (1 mk)
4. The heart is an organ made up of muscle tissue. (1 mk)
5. Photosynthesis produces glucose and carbon dioxide. (1 mk)
6. Blood group O is a universal donor. (1 mk)
7. The trachea is lined with cilia to trap dust particles. (1 mk)
8. All animals have a closed circulatory system. (1 mk)
9. Cholera is caused by a virus. (1 mk)
10. The cell wall in plants is made of cellulose. (1 mk)

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The following are matching items. Match the phrase or term in List A with that in List B by writing its letter in the spaces provided in the table at the end of the question.

1. Protects the leaf from water loss (1 mk)
2. Disease transmitted through contaminated water (1 mk)
3. Organelle for photosynthesis (1 mk)
4. Carries oxygenated blood to the body (1 mk)
5. Organisms that produce their own food (1 mk)
6. Deficiency disease due to lack of vitamin A (1 mk)
7. Enzyme that digests starch in the mouth (1 mk)

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Define the term "tissue".

1. Define the term "tissue". (10 mk)
2. Name three types of animal tissues and their functions. (0 mk)
3. State one difference between a tissue and an organ. (0 mk)

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What is meant by the term "gaseous exchange"?

1. What is meant by the term "gaseous exchange"? (10 mk)
2. Draw a labelled diagram of a leaf cross-section showing the structures involved in gaseous exchange. (5 mk)
3. List two factors that affect the rate of gaseous exchange in plants. (0 mk)

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Define the term "circulatory system".

1. Define the term "circulatory system". (10 mk)
2. Complete the table below showing the components of blood and their functions. (0 mk)
3. Name one disease that affects the circulatory system. (0 mk)

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What is a "pathogen"?

1. What is a "pathogen"? (10 mk)
2. List three ways pathogens can enter the human body. (0 mk)
3. Name two diseases caused by bacteria. (0 mk)

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Define the term "food chain".

1. Define the term "food chain". (10 mk)
2. Construct a food chain with four trophic levels starting with a green plant. (0 mk)
3. Explain two roles of decomposers in an ecosystem. (0 mk)

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Write an essay on tuberculosis using the following guidelines: • Causative agent • Modes of transmission • Symptoms • Effects on the body • Prevention and control measures

1. Causative agent (4 mk)
2. Modes of transmission (4 mk)
3. Symptoms (4 mk)
4. Effects on the body (4 mk)
5. Prevention and control measures (4 mk)

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Write an essay on the importance of water in living organisms using the following guidelines: • Role of water in cells • Importance in digestion • Role in transport systems • Regulation of body temperature

1. Role of water in cells (5 mk)
2. Importance in digestion (5 mk)
3. Role in transport systems (5 mk)
4. Regulation of body temperature (5 mk)

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