Biology Past Paper
01207030/JANUARY/F 2006 SECTION A Answer ONE question from this section.
1.
(a) (i) Describe the processes involved in photosynthesis. (6 marks) (ii) Identify TWO characteristics of the leaf that make it an effective photosynthetic organ and state how EACH characteristic mentioned facilitates photosynthesis. (4 marks) (iii) How is it possible for a plant to survive after losing all of its leaves? (2 marks) (b) The phenomenon of swarming occasionally occurs in some insect species, such as locusts. At such times locusts occur in very large numbers and they attack vegetation including crops. (i) Explain TWO consequences to a farmer if his crop is attacked by a swarm of locusts. (2 marks) (ii) Suggest why spraying with insecticide would be an ineffective method of controlling swarming locusts. (2 marks) (iii) Explain TWO methods that could be used in controlling insect pests. (4 marks)
Total 20 marks 2. (a) (i) Describe mitosis and explain why this process is important in living organisms.
(6 marks) (ii) Identify TWO parts of a plant where mitosis takes place. (2 marks)
(b) Explain to a farmer TWO advantages of having a field of cloned sugarcane. 4 marks)
(c) (i) In the process of cloning in an animal, the nucleus from the egg is replaced by a nucleus from a body or somatic cell of the same organism. What is the significance of this process? (4 marks) (ii) One of the goals of modern medicine is to replace the malfunctioning organ of a patient with an organ cloned from the patient’s own tissues. Suggest TWO reasons why this might be better than using donor organs. (4 marks) Total 20 marks
Section B. Answer ONE question from this section. 3. (a) Describe FOUR features of the human lungs which make them efficient gaseous exchange surfaces. (8 marks) (b) (1) Show how TWO features of phloem enable it to function efficiently. (2 marks) (ii) Suggest how the functioning of phloem might change during fruit formation and development. (2 marks) (c) (i) Fruits
1.
(a) (i) Describe the processes involved in photosynthesis. (6 marks) (ii) Identify TWO characteristics of the leaf that make it an effective photosynthetic organ and state how EACH characteristic mentioned facilitates photosynthesis. (4 marks) (iii) How is it possible for a plant to survive after losing all of its leaves? (2 marks) (b) The phenomenon of swarming occasionally occurs in some insect species, such as locusts. At such times locusts occur in very large numbers and they attack vegetation including crops. (i) Explain TWO consequences to a farmer if his crop is attacked by a swarm of locusts. (2 marks) (ii) Suggest why spraying with insecticide would be an ineffective method of controlling swarming locusts. (2 marks) (iii) Explain TWO methods that could be used in controlling insect pests. (4 marks)
Total 20 marks 2. (a) (i) Describe mitosis and explain why this process is important in living organisms.
(6 marks) (ii) Identify TWO parts of a plant where mitosis takes place. (2 marks)
(b) Explain to a farmer TWO advantages of having a field of cloned sugarcane. 4 marks)
(c) (i) In the process of cloning in an animal, the nucleus from the egg is replaced by a nucleus from a body or somatic cell of the same organism. What is the significance of this process? (4 marks) (ii) One of the goals of modern medicine is to replace the malfunctioning organ of a patient with an organ cloned from the patient’s own tissues. Suggest TWO reasons why this might be better than using donor organs. (4 marks) Total 20 marks
Section B. Answer ONE question from this section. 3. (a) Describe FOUR features of the human lungs which make them efficient gaseous exchange surfaces. (8 marks) (b) (1) Show how TWO features of phloem enable it to function efficiently. (2 marks) (ii) Suggest how the functioning of phloem might change during fruit formation and development. (2 marks) (c) (i) Fruits