BIOLOGY PAPER 1. 231/1. BIOLOGY. THEORY. Paper 1. March/April 2012 ...
Sign and write date of examination in the spaces provided above. ..... A Form 3
student drew the diagrams below to summarise the five kingdoms into which.
Name………………………………………………………. Index No…………………/……. School……………………………………………………… Candidates Signature……….… Date …………………………….. 231/1 BIOLOGY THEORY Paper 1 March/April 2012 2 Hours
LAINAKU JOINT ASSESSMENT KENYA CERTIFICATE OF SECONDARY EXAMINATION BIOLOGY PAPER 1 231/1 BIOLOGY THEORY Paper 1 March/April 2012 2 Hours
INSTRUCTIONS TO CANDIDATES
• • • •
Write your name and Index Number in the spaces provided above. Sign and write date of examination in the spaces provided above. Answer ALL questions in the spaces provided. All workings MUST be clearly shown where necessary.
For Examiners use only. Question
Maximum Score
1 – 29
80
Candidates Score
This paper consists of 8 Printed pages. Candidates should check the question paper to ensure that all the Papers are printed as indicated and no questions are missing
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Biology 231/1
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1. Name two types of cells in phloem tissue
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 2. Observe the diagram of the circulatory system below and answer the questions that follow.
(i) Name the type of circulation represented by the diagram. (1 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (ii) Identify parts M and N. M_________________________________________________________ N_________________________________________________________ 3. Name the organelles that would be found in large numbers in a cell of a: (a) Secretory gland
(2 marks)
(1 mark)
………………………………………………………………………………………………………… (b)
Rapidly respiring tissue
(1 mark)
………………………………………………………………………………………………………… 4. Identify types of gene mutations represented by analogies below: Intended message 1. This is my team
Actual message This is my mate
(2 marks) Gene mutations ______________
2. Aunt is staying
Aunt is straying
______________
5. In an investigation the pancreatic duct of a rat was blocked by tying it with a string. Explain how this affected the following processes: (a)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 6. Explain how the following antibodies protect the body from infection. (3 marks) (i) Antitoxins ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (ii) Agglutinins ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (iii)Lysins ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 7. A man of blood group A marries a woman of blood group B. One of their children has blood group O. Using genetic cross, show how this happens. (3 marks)
8. (a) Name the causative agent for tuberculosis in humans.
(1 mark)
………………………………………………………………………………………………………… (c)
Asthmatic attacks are characterized by difficulty in breathing. Explain.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 9. List the main characteristics used to sub-divide arthropods into classes.
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 10. In an attempt to estimate the number of weaverbirds in a small woodland435 were captured, marked and released. Three days later 620 were capture 75 of which were marked. Calculated the approximate population of weaverbirds in the woodland. (3 marks)
11. The table below shows the concentration of some important plant nutrients, in pond water, and in cell sap of a pond weed growing in a certain pond: Ion I Potassium Chloride
Concentration in pond water ppm 200 0.5
Concentration in cell sap. Ppm 50 20
Name the process by which the above ions could have been taken up by the plants (i) Potassium
(1 mark)
…………………………………………………………………………………………………………. (ii) Chloride
(1 mark)
………………………………………………………………………………………………………… 12. Distinguish between biomass and carrying capacity in an ecosystem.
Below are two set-ups of apparatus by a group of students to investigate a certain physiological process. The apparatus were put in bright light for three hours, some air bubbles were observed to evolve in set-up I but not in set-up
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Biology 231/1
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II.
(a) Explain why air bubbles were forming in set up I.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (b) Account for the observations obtained in set up II of the experiment.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 14. The formular below represents the chemical reaction during the aerobic Respiration of an organic compound. Y + 2602 18 Co2 + 18H2O +````````` 3.17 x 104 joules. (a) Calculate the respiratory quotient
(2 marks)
15. A biologist found a new organism. Using light microscope state two structures that can be used to distinguish whether the organism was of plant or animal origin. (2 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 16. The diagram below represents a palisade mesophyll cell. 17.
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Biology 231/1
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(a) What is the significance of the vertically elongated shape of the cells?
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (c) Suggest why the structures labeled A would be more on one side of leaf than the other (1 mark) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 18. A Form 3 student drew the diagrams below to summarise the five kingdoms into which organisms are divided. Study the diagram and answer the questions that follow. (3 marks)
(a) Which kingdoms are represented by x and y.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (b) State one characteristic that members of x may share with prokaryotes. www.kcse-online.info
Biology 231/1
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………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 19. Explain why insulin is not administered orally.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 20. State two economic importances of colchicines as a plant excretory product.
(2 marks)
………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 21. Give the advantages of excreting nitrogenous waste products mainly in form of uric acid as compared to urea. (2 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 22. Study the organism shown below and answer the questions that follow.
(b) State the kingdom to which the organism belongs and give a reason for your answer. (2 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. ………………………………………………………………………………………………………… 23. The diagram below represents human dentition. (a) The letters represent 1- incisors, C canines, PM- premolars, M- molars.
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Biology 231/1
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Write the dental formula and use it to calculate the total number of teeth. (3 marks)
24. Name three gaseous exchange structures in plants. (3 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. …………………………………………………………………………………………………………. 25. What is meant by the following terms? (a) Ecological niche (1 marks) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. (b) Habitat (1 mark) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 26. Name the hormones in insects responsible for (i) Formation of larval cuticle (1 mark) ………………………………………………………………………………………………………… (ii) Metamorphosis (1 mark) ………………………………………………………………………………………………………… 27. Expectant women are adviced to have a balanced diet with plenty of protein, calcium and iron. What role is played by each in the life cycle of an embryo. (3mks) (i) Protein …………………………………………………………………………………………………………. (ii) Calcium …………………………………………………………………………………………………………. (iii) iron …………………………………………………………………………………………………………. (i) Define the term primary growth in plants. (1 mark) ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. www.kcse-online.info
Biology 231/1
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(ii). Name the hormone responsible for apical dominance in plants.
(1 mark)
…………………………………………………………………………………………………………. 28. State three conditions that favoured chemical evolution. (3 marks) …………………………………………………………………………………………………………. ………………………………………………………………………………………………………… …………………………………………………………………………………………………………. 29. (i) Which nucleus in a pollen grain undergoes mitosis to form 2 nuclei gametes? (1 mark) ………………………………………………………………………………………………………… (ii). Name the nuclei labeled K in the embryo sac below (1 mark) …………………………………………………………………………………………………………
