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Nandi North Biology Paper 1 Question Paper

Nandi North Biology Paper 1

Course:Secondary Level

Exam Year:2006

Answer all questions in the spaces provided
1. In a family, all off springs have blood group AB. What are the possible blood groups of
the parents? 1mk*NDI*
2. What type of cell division occurs in gamete cells. 1mk*NDI*
3. State two functions of gibberellins. 2mks*NDI*
4. What characteristics of Arthropoda makes them most successful of invertebrates. Explain. 2mks*NDI*
5. The viability of seeds is a necessary internal condition for germination. State two factors
that may lead to loss of viability 2mks*NDI*
6. Give a reason for each of the following:-
a) a mature plant does not lose its shape even after losing water. 1mk*NDI*
b) Xylem vessels do not collapse even when they do not contain water. 1mk*NDI*
7. (i) Name the products of the dark reaction in photosynthesis. 1mk*NDI*
(ii) Why do plants in low altitude grow faster than plants in high altitude. 2mks*NDI*
8. In what two ways is self-pollination not possible in some plants. 2mks*NDI*
9. Name the diseases caused by deficiency of:-
a) Phosphorus 1mk*NDI*
b) Vitamin B2 1mk*NDI*
c) Protein 1mk*NDI*
10. State three processes that maintain the movement of water in plants from roots to the leaves. 3mks*NDI*
11. The diagram below shows a specialized cell.

a) Identify the cell …………………………………………………………. 1mk*NDI*
b) State any two structural adaptations of the cell shown in the diagram above that
accelerate the rate of nerve impulse transmission. 2mks*NDI*
12. Give an example of incomplete dominance in animals. 1mk*NDI*
13. a) A man has non-pigmented skin, pink eye-iris , very poor eye sight and very light white hair. Name the type of hereditary disorder the man has. 1mk*NDI*
b) The man in 16(a) above marries a woman carrier of the trait for disorder. What’s the probability of their children inheriting the trait. 1mk*NDI*
14.

The figure above shows a half jaw of an animal, use it to answer the questions that follow.
a) State the number of teeth found in the lower jaw. 1mk*NDI*
b) (i) State the mode of feeding 1mk*NDI*
(ii) Give a reason for your answer in b(i) above 1mk*NDI*
c) State one function of enamel in mammalian tooth. 1mk*NDI*
15. a) When the pancreatic duct is blocked in a mammal blood sugar regulation remain the same. Explain. 2mks*NDI*
b) Differentiate between assimilation and egestion as used in animal digestion.2mks*NDI*
16. The figure below shows a part of female reproductive structure of a plant. Label the marked parts. 3mks*NDI*

17. The table below shows the estimated number of organisms in a lake.
Type of organisms Weight in gram
Mosquito larvae
Aquatic plants
Bacteria
Fishes 800g
5000g
40g
1200g
Use the table to answer the questions below
a) Construct a possible food chain. 1mk*NDI*
b) Construct a pyramid of Biomass for the given data. 2mks*NDI*
18. A form one student, trying to estimate the size of onion cells observed the following on microscope’s field of view

He counted 20 cells across the field of view. Calculate the size of one cell in micrometres. 2mks
b) State the function of a diaphragm in a microscope. 1mk*NDI*
19. In what ways is a spermatozoan adapted to its function? 2mks*NDI*
20.

The set up above shows an experiment to investigate photosynthesis.
a) What gas was collected in the test tube? 1mk*NDI*
b) What two environmental conditions are necessary for the experiment . 2mks*NDI*
c) What was the role of sodium hydrogen carbonate in the experiment? 1mk*NDI*
21. a) State two common features possessed by perennating organs that adapt them to
their functions. 2mks*NDI*
b) State the uses of the following plant products. 2mks*NDI*
(i) Tannins *NDI*
(ii) Papain*NDI*
22. The diagrams below shows stages in mitotic cell division.

(i) Name the stages A and B. 2mks*NDI*
(ii) What is the significance of mitosis in living organisms 2mks*NDI*
23. How are mesophyll parenchyma cells suited to performing their functions. 2mks*NDI*
24. What are the functions of the following hormones in human menstrual cycle.
a) Follicle stimulating hormone (FSH) 1mk*NDI*
b) LH (Luteinising hormone) 1mk*NDI*
25. a) What is seed dormancy. 1mk*NDI*
b) State two factors that cause seed dormancy. 2mks*NDI*
c)

What type of seed germination is represented in the diagram above. 1mk*NDI*
26. a) Define geotropism. 2mks*NDI*
b) Which parts of a plant are positively geotropic? 1mk*NDI*
27. Explain how plant roots take up oxygen and eliminate carbon (IV) oxide into the soil 2mks*NDI*
28.

a) Name the organelle shown in the diagram above. 1mk*NDI*
b) State functions of the following cell structures.
(i) Vacuoles 1mk*NDI*
(ii) Nucleolus 1mk*NDI*
29. a) What is meant by vestigial structures. 1mk*NDI*
b) Name two vestigial structures present in man. 2mks*NDI*
30. What’s active transport? 1mk*NDI*
31. The diagram below shows a gill obtained from fish. Study it and answer the questions below it

a) Label A ………………………………………………………. 1mk*NDI*
b) What is the function of gills to fish? 1mk*

Nandi North Biology Paper 1 Question Paper

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