Which of the following parts of the heart is responsible for preventing the backflow of blood into the left atrium during ventricular systole?

The process by which organisms maintain a stable internal environment is called:

The following are matching items. Match the phrase or term in List A with that in List B by writing its letter in the space provided in the table at the end of the question. LIST A LIST B (i) Storage of genetic material A. Nucleus (ii) Disease caused by deficiency of iodine B. Goitre (iii) Structure for gaseous exchange in insects C. Tracheae (iv) Transports water in plants D. Xylem (v) Hormone that regulates blood sugar E. Insulin (vi) Caused by lack of vitamin B3 F. Pellagra (vii) Blood cells that carry oxygen G. Erythrocytes (viii) Process of cell division in body cells H. Mitosis (ix) Organism that lives on or in another organism I. Parasite (x) Enzyme that digests proteins in the stomach J. Pepsin Answers: LIST A i ii iii iv v vi vii viii ix x LIST B

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(a) Define the term "enzyme". (b) Name three digestive enzymes and their functions. (i) Function: (ii) Function: (iii) Function:

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What is meant by the term "excretion"?

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Define the term "food web".

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What is meant by the term "microorganism"?

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Define the term "respiration".

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

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Write an essay on the importance of personal hygiene using the following guidelines: • Definition of personal hygiene • Practices of personal hygiene • Importance of personal hygiene • Consequences of poor hygiene

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