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

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

Light intensity, temperature and carbon dioxide concentration

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

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.

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.

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

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