cameroon gce O level June 2023 biology 2

cameroon gce O level June 2023 biology 2

cameroon gce O level June 2023 biology 2

SECTION A
Answer ALL 3 questions
1. (a) Draw a Spirogyra cell to show its features. (5 marks)
(b) Give the functions of any four parts labelled. (4 marks)
(c) How is Spirogyra different from an Amoeba? (6 marks)
(d) What will happen if a marine amoeba is put in a fresh water environment? (5 marks)
(Total = 20 marks)
2. (a) Describe an experiment to measure the rate of water uptake by,a leafy shoot. (9 marks)
(b) Explain how three (3) environmental factors affect the rate of transpiration. (6 marks)
(c) Tabulate the differences between a dicotyledonous stem and a monocotyledonous stem? (5 marks)
(Total = 20 marks)
3. (a) Define the following terms as used in ecology:
(i) Pollutant.
(ii) Afforestation. (2,2 marks)
(b) State the harmful effects of bush burning. (5 marks)
(c) Describe the flow of energy in nature. (6 marks)
(d) During a bush burning exercise, the quantity of carbon dioxide released was estimated and measured at regular intervals as shown in the table below.
Time/minutes 0 5 15 25 30 35
COz/litres 0 10 30 80 70 50

Draw a graph to represent this information. From the graph, determine the amount of carbon dioxide that will be released during the 10th minute. (5 marks)
(Total =20 marks)
SECTION B
Answer any 2 questions
4. (a) Draw a neatly labelled diagram to show the position of endocrine glands in a male mammal. (6 marks)
(b) State the functions of the mammalian skeleton. (8 marks)
(c) Describe what happens when the hand touches a hot object? (6 marks)
(Total =20 marks)
5. (a) Draw a large labelled diagram of the longitudinal section through the mammalian heart,
showing the direction of blood flow. (13 marks)
(b) Describe the functions of the major components of blood. (7 marks)
(Total =20 marks)
6. (a) Make a large labelled diagram of the male reproductive system of a mammal. (8 marks)
(b) What is meant by:
(i) Ovulation,
(ii) Fertilization,
(iii) Pollination? (2,3,3 marks)
(c) Bring out four (4) differences between an insect pollinated flower and a wind pollinated
flower. (4 marks)
(Total =20 marks)

7. (a) What is holozoic nutrition?
(b) How is the ileum adapted for absorption of soluble food?
(c)

(10 marks) (Total =20 marks)

GO BACK AND CHECK YOUR WORK