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Question
In tropical rain forests, the canopy is thick and plants growing below receive filtered light. How are they able to carry out photosynthesis?
Solution
Light is rarely a limiting factor for photosynthesis because just 10% of the full sunlight is sufficient to ensure light saturation. In plants that thrive under a large canopy in forests; a less percentage of light may slow down the rate of photosynthesis but it cannot halt photosynthesis during daytime. Hence, these plants are able to carry on photosynthesis.
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RELATED QUESTIONS
Short answer question.
Which four of the following are needed for photosynthesis in a leaf:
(i) Carbon dioxide:
(ii) Oxygen:
(iii) Nitrates :
(iv) Water:
(v) Chlorophyll:
(vi) Soil:
(vii) Light:
Short answer question.
Which gas is taken in and which one is given out by the leaf in bright sunlight?
(i) Taken in :
(ii) Given out:
Suppose we compare the leaf with a factory, match the items in Column A with those in Column B.
| Column A | Column B | ||
| Left | Factory | ||
| 1 | Cells in the leaf | a | Raw materials |
| 2 | Chloroplast | b | Power |
| 3 | Sunlight | c | Machinery |
| 4 | Oxygen and water | d | End product |
| 5 | Carbon dioxide and water | e | By product |
| 6 | Glucose | f | Workroom |
State whether the following statement is True or False:
Green plants prepare their food by using two raw materials, oxygen and water.
State whether the following statement is True or False:
Photosynthesis occurs only in chlorophyll-containing parts of the plant.
Are the following statement true or false? Give a reason in support of your answer.
The outside atmospheric temperature has no effect on the rate of photosynthesis.
When there is plenty of light and a higher concentration of O2, what kind of pathway does the plant undergo? Analyse the reasons.
Process of photosynthesis is ______.
Photorespiration is favoured by :
The optimum temperature for the process of photosynthesis is ______.
