cameroon gce O level June 2024 biology 2
cameroon gce O level June 2024 biology 2
Define the following terms.
:i) Excretion,
ii) Homeostasis.. (4,5 marks)
(b) Describe the role of the kidney in osmoregulation.
(c) Explain how the human body regulates the amount of sugar level in blood.
*> (a) Draw a large labelled diagram or describe the structure of:
i) A mould fungus. ;
ii) An Amoeba.
(b) How does a mould fungus carry out asexual reproduction?
(c) Account for the various ways by which Fungi are beneficial to man.
(5, 4marks)
(6 marks)
(5 marks)
(Total = 20 marks)
(a) State the biological importance of:t
i) Nitrogen to plants,
ii) Nitrogen fixation in nature.
(b) Describe the role of the following processes in the circulation of carbon in nature;
i) Photosynthesis.
ii) Respiration.
(c) How does deforestation affect the carbon cycle?
j.
SECTION B
Answer any 2 questions
(a) State the differences between aerobic and anaerobic respiration.
(b) Describe an experiment to show that carbon dioxide is produced by a potted plant during respiration.
(c) What is the disadvantage of putting a potted plant inside a living room at night?
(a) Draw a large labelled diagram of the mammalian skin.
(b) What are the differences between the epidermis of the mammalian skin and that of a leaf?
(c) How is temperature regulation carried out in the mammalian skin during over heating?
5. (9 marks)
(6 marks)
(5 marks)
(Total=20 marks)
Define the following terms as used in genetics,
i) Homozygous.
ii) Heterozygous,
iii) Recessive.
6 (a)
iv) Dominance. (2,2,2,1 marks)
A farmer grows plants with rose flowers that are either red in colour or white. He realized that there was a quest
for pink coloured roses. In an attempt to get the pink coloured roses, he crossed the pure breed rose flowered
plant with the pure breed white flowered plant.
Using genetic symbols and diagrams explain the results of this cross.
What would be the outcome of a cross between the pink flowers and the red parent?
(a) Define the following terms:
i) Stimulus.
ii) Tropism.
iii) Reflex action.
iv) Effector.
(b) Draw a well labelled diagram of the mammalian brain.
