KCSE BIOLOGY 2014
Biology Paper 1 (231/1) Answer all the questions. 1 State the importance of each of the following in living organisms: (a) nutrition(1 mark) (b) excretion.(1 mark) 2 (a) What is meant by the term seed dormancy?(1 mark) (b) State three causes of seed dormancy.(3 marks) 3 State two functions of the placenta in mammals.(2 marks) 4 The diagram below illustrates a growing pollen tube. (a) Name the part labelled B.(1 mark) (b) Explain the role of the pans labelled A .(2 marks) 5 The diagram below shows a set up for an experiment to demonstrate a certain physiological process. (a) What nature of solution is represented by 20% sugar solution? (1 mark) (b) Explain the observation made on the set up after one hour. (2 marks) 6 State three roles of auxins in a plant stem. (3 marks) 7 A student drew a 6cm long diagram of a plant flower. If the actual length of the flower was 12 cm. calculate the magnification of the drawing made by the student. Show your