Biology Form 5 C2

Diagram 1 shows the cross section of a leaf. This plant is exposed to dust from a nearby housing area construction site.

• The release of oxygen to the environment increases.

• The release of

  carbon dioxide to the surroundings decreases.

• The production of starch increases.

• The production of glucose decreases.

Which of the following properties help the lamina to carry out photosynthesis more efficiently?

• I and II

• I and III

• II and IV

• III and IV

Diagram 2 shows the condition of a stoma.

• I and II

• II and IV

• I and III

• III and IV

Which environmental conditions cause the stomata of a plant to close up?

• A

• B

• C

• D

Which plant has more stomata on the upper surface of the leaf?

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• 
• 
• 

Which combination of environmental conditions lowers the rate of transpiration in plants?

• A

• B

• C

• D

Which plant organ carries out about 90% of transpiration in plants?

• Root

• Stem

• Leaf

• Flower

The graph in Diagram 3 shows the effects of light intensity on the rate of transpiration in a plant.

Which line, A, B, C or D, shows the correct rate of transpiration?

• A

• B

• C

• D

A student carries out an investigation to determine the rate of transpiration in plants by using the potometer in Diagram 4.

• 1.2 cm per minute

• 0.012 cm per minute

• 12 cm per minute

• 0.12 cm per minute

Diagram 5 shows the cell component of a plant cell.

Which equation represents the reaction that occurs in R?

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• 
• 
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