Grade 8 biology first term 2013

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First term test 2013 grade 8 biology GAAtoll School Kolamafushi

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Section A

Choose the correct answer from the questions and underline.

1. A plant is grown in bright sunshine. After a few hours, a leaf is stained with iodine solution. The diagram shows what is seen when the leaf is placed under a

microscope.which structure will be stained blue black?

2 .Identical pieces of potato are placed in sucrose solutions of different concentrations. After three hours, the mass of each potato piece is measured.

Which graph shows the results of this experiment?

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3.The diagram shows a section through a leaf.

4. Which substances are transported in xylem and in phloem?

5. Which signs show that a plant has been grown in a culture solution deficient in

magnesium?

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6 .The photomicrograph shows onion epidermis.

7. Diagram 1 shows an onion cell that has been placed in pure water.

The cell is now placed in a concentrated sugar solution. It changes to appear as in

diagram 2.

Diagram 2

Which statement explains the change?

A. Sugar has moved into the cell.

B. Sugar has moved out of the cell.

C. Water has moved into the cell.

D. Water has moved out of the cell.

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8. According to the lock and key hypothesis, which is the lock and which is the key for

the enzyme lipase?

9. Which graph shows the effect of temperature on the rate of photosynthesis?

10. The water weed shown in the apparatus is illuminated and is photosynthesising.

The rate is measured by bubbles of gas released.

. After a few minutes the bubbles cease.

Which factor in the water might be limiting the rate of photosynthesis?

A. carbon dioxide B. magnesium C. nitrate D. oxygen

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11. A plant has leaves that are partly green and partly white. The plant is destarched

and a leaf is partly covered by black paper.

The plant is placed in bright light for several hours. Four discs are then cut from the leaf

in the positions shown and are tested for starch.

12. Crop plants are grown in well-watered soils. Their root hair cells have higher

concentrations of mineral ions than in the soil surrounding them. What processes

are used by these plants to absorb water and mineral ions?

13. A plant is grown in bright sunshine. After a few hours, a leaf is stained with iodine

solution. The diagram shows what is seen when the leaf is placed under a microscope. Which structure will be stained blue / black?

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14. The small intestine contains a low concentration of glucose produced from the

digestion of starch. Glucose is taken up by the cells of the villi. How does the

glucose move?

15. A human red blood cell is placed in a strong salt solution.

In which direction does water move and what is the effect on the cell?

16 . What is the function of chlorophyll

17. The graph shows the results of an experiment measuring the rate of photosynthesis in a pond plant at differing light intensities.

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18. The diagram shows the arrangement of cells inside the leaf of a green plant.

(No cell contents are shown.).

Where we can see the chloroplasts?

A. 1 only B. 2and 3 C. 2,4 and 1 D. 2and 4 19. The diagram shows a root hair, surrounded by a dilute solution of mineral ions.

20. Which shows the increasing level of complexity in plants.?

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21. Which processes can take place in a root hair cell when oxygen is not available?

22. The graph shows the effect of temperature on a chemical reaction which is

controlled by enzymes. At which point are most product molecules being released?

23. Starch is digested to maltose by the enzyme amylase. According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

24.Which is the deficiency disease of magnesium?

A. Chlorosis B.Stunded growth C. Scurvy D.Aneamia

25. Protease enzyme breaks down protein to amino acids.

In the ‘lock and key’ hypothesis, what is the lock and what is the key?

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26. Starch is digested to maltose by the enzyme amylase.

According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

27. The diagram shows a plant cell.

Which features are not found in animal cells?

A. 1 and 2 B. 1 and 3 C. 2 and 4 D. 2 and 5

28. The concentration of nitrate ions in a root cell is higher than in the surrounding soil

solution. How do the nitrate ions move into the root cell?

A. active transport B. diffusion C. Osmosis D. transpiration

29. . Similar shaped pieces of potato are placed in sucrose solutions of different concentrations.

After three hours, the mass of each potato piece is measured.

Which graph shows the results of this experiment?

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30. .The diagram shows a cell.

Which numbers show the parts named?

Section B

Answer the following questions.

1.which are the types of carbohydrates?

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2.which are the adptations of red blood cell?

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3.Define diffusion with example.

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4. Define osmosis.

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5. Define active transport with example.

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6. Name different types of cells in your body.

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7.Explain the difference between cell wall and cell membrane?

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8.Which are the major and minor elements?

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9. Which are the raw materials of photosynthesis?

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SECTION C

1,Fig. 1.1 shows, in order, four stages in which an enzyme-controlled chemical reaction may

Occur.

Fig 1.1

(a) Identify M, N, O and P.

M .........................................................................

N ..........................................................................

O ..........................................................................

P .......................................................................... [4]

(b) By referring to Fig. 1.1, explain why only a small amount of enzyme is needed to

catalyse a reaction involving many molecules.

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(c) (i) Explain how a rise in temperature may increase the rate of an enzyme-controlled

reaction.

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(ii) At high temperatures, enzymes are denatured and can no longer act as catalysts.

By using the letters M and N from Fig. 2.1, suggest what happens when an enzyme is

denatured.

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[Total:10]

2. Fig. 2.1 shows a section through a leaf with only some of the cells drawn.

Fig 2.1

(a) On Fig. 2.1, draw and label in their correct positions:

(i) a palisade mesophyll cell; (ii) a spongy mesophyll cell;

(iii) a pair of guard cells; (iv) a cuticle. [4]

(b) On Fig. 3.1, label and name the tissue bringing water into the leaf.

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(c) Explain how plants are absorbing carbondioxide and water.

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(d) Suggest one reason why epidermal cells are important to a leaf.

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[Total:10]

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3. Fig. 3.1 shows a cell from an organism.

Fig 3.1

(a) (i) In which type of living organism are cells similar to the one shown in Fig. 3.1

normally found?

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(ii) State two reasons for your choice of living organism in (i).

1. ...............................................................................................................................

2. .............................................................................................. .............................[2

Fig. 3.2(a) shows the same cell after it had been placed in solution A for ten minutes. The cell was then transferred to solution B and Fig. 3.2(b) shows how it appeared after

a further ten minutes.

3.2(a) 3.2(b)

(b) Explain what has occurred to cause the cell to appear as it does in Fig. 3.2(a).

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(c) Compared with the water potential of the cell, what can be deduced about solutions

Aand B?

solution A .........................................................................................................................

solution B .....................................................................................................................[2]

(d) What will be found in region C in Fig. 1.2(b) at the end of the experiment?

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Explain your answer.

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[Total:10]

4.Fig. 4.1 shows the cell membrane of an animal and a plant cell.

Fig 4.1

(a) On Fig. 4.1, draw and label

(i) one other structural feature that is found in both cells,

(ii) two features found in a plant cell but not in an animal cell. [5]

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b) Write down the difference between plant cell and animal cell?

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[Total:10]

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5. Define a cell? Write down the different type of cells of plants and animals?

List down the importance of chlorophyll and root hair cell to plants?

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Grade 8 biology first term 2013

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