G.C.E O/L BIOLOGY 2016 PAPER 2

Two and a half hours

Two Hours
Answer FOUR questions, Two from Section A and TWO from Section B. All questions carry equal marks.
Marks allocated to parts of questions are indicated in brackets.
If more than TWO questions are answered in Section A or B, only the FIRST TWO shall be marked.
Give labelled diagrams where these will make the answers clearer.
Begin each question on a new page.
You are reminded of the necessity for good English and orderly presentation in your answers..

SECTION A

(1) (a)List the characteristics common to insects. (7 marks)
(b)the cycle of a Housefly, (11 marks)
(c)insects beneficial in nature? (7 marks)
(Total = 25 marks)


2. (a) Give a balanced equation that summarizes aerobic respiration. (5 marks)
(b) Describe an experiment to demonstrate that germinating seeds produce heat. (13 marks)
(c) Give the differences between aerobic and anaerobic respiration. (7 marks)
(Total = 25 marks)


3. (a) Give an account of the circulation of water in nature. (15 marks)
(b) Describe an experiment to demonstrate Osmosis in living tissue. (10 marks)
(Total = 25 marks)


4. (a) What is genetic engineering? (3 marks)
(b) Give an account of the importance of genetic engineering to man. (10 marks)
(c) How is light important to
(i) Plants,
(ii) Animals? (12 marks)
(Total = 25 marks)


SECTION B

5. (a) How is the leaf of a plant suited for photosynthesis?. (15marks)
(b) How would you demonstrate that light is necessary for photosynthesis? (10 marks)
(Total = 25 marks)


6. (a) Define the term Excretion. (4 marks)
(b) List the excretory products of plants and their methods of elimination (8 marks)
(c) List the excretory organs in man and state what each eliminates. (8 marks)
(d) How is osmoregulation carried out in a fresh water amoeba? (5 marks)
(Total = 25 marks)


7. (a) Define the following terms:
(i) Genetics.
(ii) Genotype.
(iii) Heterozygous.
(iv) Fertilization (8 marks)
(b) A Gardener crossed a white flowered plant and a red flowered plant and the resulting F1 plants had pink flowers. When he crossed the pink flowered plants among themselves, the next generation of
plants (F2) had 22 red, 80 pink and 20 white flowers.
Using suitable genetic symbols and diagrams, describe the genetics of the above crosses as fully as
possible. (17 marks)
(Total = 25 marks)


8. (a) Define the following terms:
(i) Stimulus.
(ii) Tropism.
(iii) Reflex action. (11 marks)
(b) Describe what happens when the hand accidentally touches a hot object. (10 marks)
(c) How are tropisms important to plants? (4 marks)
(Total= 25 marks)
Ga /0510/2/A

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