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FIRST ASSESMENT TEST 2012

Structured question. Answer all questions ( 30 marks)

1 Diagram 1 shows a typical cell structure as seen under an electron

microscope. OrganelleXis rod-shaped and 1 mm to 2 mm in length.

(a) LabelP, Q, R and Sin Diagram 1.

(b) -State the function ofP, Q, R and S.

P : ___________________________________________ R :_______________________________________

Q : ___________________________________________ S. : __________________________________

[4 marks](c) (i) What is organelle X?

______________________________________________________________________________________

[1 mark]

(ii) Explain why the number of organelleXin somatic cells are less compared with the male

gametes?

______________________________________________________________________

____________________________________________________________________

[1 mark]

(d) (i) Name the granules called organelle Y and state its location.

___________________________________________________________________________________

(1mark]

(ii) State its function.

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__________________________________________________________________________________

[1 mark]

(e) State the difference between Q that is present in animal cells and in plant cells.

________________________________________________________________________________

(1 mark]

(f) what will happen to an animal cell without organel X?

___________________________________________________________________________________________

(1 mark)

2. Diagram 2 shows a plant cell.

Diagram 2

(a) State one difference of this cell compared with an animal cell._______________________________________________________________________________

(1 mark]

(b) What is organelle M?

________________________________________________________________________________

[1 mark]

(ii) Why is organelle M important?

__________________________________________________________________________________

[1 mark]

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(c) (i) What are the strand-like structures found in organelle N?

_________________________________________________________________________________

[1 mark]

(ii) What is organelle N?

_______________________________________________________________________________

[1 mark]

(iii) Besides controlling the cell activities, what is the function of organelle N?

________________________________________________________________________________

[1 mark]

(d) State one characteristic of Q.

__________________________________________________________________________

(1 mark]

(e) State one difference between Q and O.

__________________________________________________________________________

[1 mark]

(f) Organelle P, which contains ribosomes, performs a function related to the function of organelR.

Explain how these functions are related.

___________________________________________________________________________

____________________________________________________________________________

___________________________________________________________________________

[2 marks]

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3 A st ude nt found that the numbe r of Amoeb a sp. doubl es every 20 minutes. Table 3 shows the

results of a two-hour observation.

a) (i) Name the type of reproduction shown in Table 3.

______________________________________________________________________________________

[1 mark]

(ii) Using a diagram, explain the reproduction principles of an Amoeba sp.

[2 marks]

(b) What is osmoregulation? Explain this process in an Amoeba sp.

___________________________________________________________________________________________

_

____________________________________________________________________________________________

_

_____________________________________________________________________________________________

( 2 marks)

(c) (i) What is the food of Amoeba sp.?

__________________________________________________________________________________

____

[1 mark]

(ii) Using a diagram, explain how the Amoeba sp. consumes its food.

(4 marks)

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