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CSEE

Biology · Paper 1 · 2020

17 questions 🇹🇿 NECTA ✓ Official NECTA answers

CSEE 🇹🇿 NECTA ✓ Official NECTA answers

Biology · Paper 1 · 2020

17 questions

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Questions (17)

Section A

1. 15 marks

For each of the items (i) - (x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided.

A. Uric acid

B. Lactic acid

C. Water

D. Alcohol

E. Pyruvic acid

2. 5 marks

Match the functions of the parts of microscope in List A with their corresponding parts of microscope in List B by writing the letter of the correct response beside the item number in the answer booklet provided.

(i) Allows light to pass from the objective lens to the eye piece lens. 1 mk

(ii) Supports the eye piece and revolving nose piece. 1 mk

(iii) Raises or lowers the body tube in order to bring the image into sharp focus. 1 mk

(iv) Raises or lowers the body tube in order to bring the image into focus. 1 mk

(v) Raises and lowers the stage to keep the specimen in right position for observation. 1 mk

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Section B

3. 6 marks

Answer all questions in this section.

(a) How can fire accidents be avoided in the school laboratory? Give three points. 3 mk

(b) Suggest three causes of cut accidents at home. 3 mk

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4. 8 marks

Explain the structure of tilapia fish by considering the following features:

(a) Nature of skeleton. 2 mk

(b) Types of scales. 2 mk

(d) Tail fin. 2 mk

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5. 8 marks

Suppose you had a study tour visit to Serengeti National park and you find the following organisms; lions, buffalo, wildebeest, hyena, shrubs, grasses and bacteria.

(a) Construct a food web that accommodates all the organisms. 5 mk

(b) What will happen into the ecosystem if bacteria are eliminated? 3 mk

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6. 4 marks

While performing surgery on a mammal, two blood vessels were cut by mistake. In one of the vessels blood flow out with high pressure while in the other vessel blood flow out with low pressure.

(a) What are the names of the two blood vessels? 2 mk

(b) Why one blood vessel had high pressure and the other low pressure? Briefly explain. 2 mk

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7. 6 marks

Briefly explain three significances of mitosis in living organisms.

(none) Briefly explain three significances of mitosis in living organisms. 6 mk

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8. 8 marks

How is the mammalian eye adapted to its function? Give four points.

(none) How is the mammalian eye adapted to its function? Give four points. 8 mk

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9. 6 marks

How do plants get rid of excretory products? Briefly explain three ways.

(none) How do plants get rid of excretory products? Briefly explain three ways. 6 mk

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10. 6 marks

Water and salts are needed in constant amount for effective functioning of the body. Briefly explain three factors which affect the content of salts and water in human body.

(none) Briefly explain three factors which affect the content of salts and water in human body. 6 mk

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11. 8 marks

Give four differences that exist between insect pollinated flowers and wind pollinated flowers.

(none) Give four differences that exist between insect pollinated flowers and wind pollinated flowers. 8 mk

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12. 10 marks

In an experiment, bean seeds having a smooth seed coat were crossed with beans having wrinkled seed coat. All the seeds obtained in the first filial generation (F ) had a smooth seed coat. Use genetic cross to find out the formation of (F ) individuals. 1 2

(none) Use genetic cross to find out the formation of F2 individuals. 10 mk

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Section C

13. 15 marks

Tuberculosis (TB) is among the threatening diseases in the country.

(a) Give four points on how you will educate the people on its symptoms. 1 mk

(a) Give four points on how you will educate the people on its symptoms. 8 mk

(b) Give five preventative measures to be taken in order to minimize the spread of the disease. 1 mk

(b) Give five preventative measures to be taken in order to minimize the spread of the disease. 7 mk

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14. 10 marks

Members of Matatu village are hunters, farmers and fishermen. They obtain a variety of foods from their activities but do not have food processing industries.

(none) With one example in each case, explain four methods which will help villagers to preserve their food. 10 mk

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15. 10 marks

Human skeleton serves several functions in the body.

(none) With one example in each case, explain four functions of human skeleton. 10 mk

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