Formative Practice 2.4 (Form 5 Biology Textbook Exercise and Answer)


Question 1:
State three main factors affecting the rate of photosynthesis.

Answer:
Light intensity, temperature and carbon dioxide concentration


Question 2:
State the effects of different light intensities on the rate of photosynthesis.

Answer:
At low light intensities, the stomata will close and lower the rate of photosynthesis. At high light intensities, the stomata will open and until it reaches a point. After the point, the rate of photosynthesis does not increase because other factors become limiting factors.


Question 3:
Mr. Kumar has succeeded in planting a grape plant in a greenhouse in Cameron Highlands. List the equipment needed.

Answer:
Supply of water, bulb with appropriate light intensity, adjustable heater at 25 oC, optimum temperature for enzyme reaction in photosynthesis and carbon dioxide source.


Question 4:

Light-independent reaction depends on the light-dependent reaction.
Do you agree with this statement? Explain.

Answer:
Agree. A light-independent reaction requires NADPH and ATP which is produced in a light-dependent reaction.

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