Answer any three questions only.
1. (a) List four floral whorls of Hibiscus flower.
(b) Explain the processes involved in digestion of protein in man.
(c) In a tabular form, give two differences between mitosis and meiosis.
2. (a) Draw a well labelled diagram (8-10 cm long) of the mammalian skin.
(b) List four types of placentation in flowering plants.
(c) State four methods of birth control in human.
3. (a) Describe the mechanism of opening and closing of stomata in a leaf.
(b) Name two pollutants each of air and water.
(c) Name three abiotic factors that affect organisms in an ecosystem.
4. (a) Name three supporting tissues in plants.
(b) List three characteristics of enzymes.
(c) Give three excretory organs in mammals.
5. (a) List four examples of reflex action.
(b) Why are chromosomes regarded as the basis of heredity?
Answer (2)
The Hibiscus flower has four floral whorls: sepals, petals, stamens, and carpels. Mitosis and meiosis differ in the number of daughter cells produced and the processes involved. Enzymes are specific catalysts affected by temperature and pH. ;
The Hibiscus flower has four main floral whorls: sepals, petals, stamens, and carpels. Mitosis produces two identical diploid cells, while meiosis results in four genetically diverse haploid cells, with the processes differing mainly in division and crossing over. In mammals, key excretory organs include the kidneys, ureters, and bladder, all functioning to eliminate waste from the body.
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