KCSE PIVOT BIOLOGY

SECTION A: ANSWER ALL QUESTIONS 1. Bile and pancreatic juice are important secretions in animal nutrition a) In which part of the digestive system do they exert their influence? (1 mark) ……………………………………………………………………………………………………… b) i). For efficient digestion, which of the two secretions should be mixed with chyme first? ……………………………………………………………………………………………………… ii). Explain your answer above (2 marks) ……………………………………………………………………………………………………………………………………………………………………………………………………………… c) Explain why: i). It is not necessary to eat too much protein in the diet (2 marks) ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ii). Liver is recommended in the diet of anaemic persons (2 marks) ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… 2. Below is a representation of an independent unit of the biosphere. Use i...

1. (a) In sheep, the number of chromosomes in mature egg cells is 28. How many chromosomes are found in the somatic cell of sheep? (1 mark) ………………………………………………………………………………………………….. (b) Which cells are haploid and triploid in the life cycle of a typical flowering plant? (2mark)2 ………………………………………………………………………………………………………… 2. A mammoth has become extinct with time. Give two reasons why it became extinct. (2 marks)5 …………………………………………………………………………………………………………………………………………………………………………………………………………………… 3. Differentiate between dormancy and hibernation. (1 mark)6 …………………………………………………………………………………………………. 4. What is the importance of genetic variations in evolution? (3 marks)9 …………………………………………………………………………………………………………………………………………………………………………………………………………………… 5. Blood transfusion of Rh+ve blood was given to a patient with Rh- blood. After one week, a similar transfusion was given to the same patient. What was likely to hap...