Assertion(A): As a plant photosynthesises, many factors will simultaneously affect its rate.
Reason(R): Usually one factor is the major cause or is the one that limits the rate.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Factors Affecting Photosynthesis |
 61%
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Assertion(A): When several factors affect any [bio] chemical process, Blackman’s (1905) Law of Limiting Factors comes into effect.
Reason(R): At any point of photosynthesis, the rate will be determined by the factor available at sub-optimal levels.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Factors Affecting Photosynthesis |
From NCERT
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Assertion(A): The effect of water as a factor is more through its effect on the plant, rather than directly on photosynthesis.
Reason(R): Water stress also makes leaves wilt and increases metabolic activity as well.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Factors Affecting Photosynthesis |
 60%
From NCERT
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Assertion(A): Except for plants in shade or in dense forests, light is rarely a limiting factor in nature.
Reason(R): Plants show light saturation at 10 percent of the full sunlight.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Factors Affecting Photosynthesis |
 70%
From NCERT
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Assertion(A): Green plants are called autotrophs.
Reason(R): The green plants synthesise the food they need through photosynthesis.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Factors Affecting Photosynthesis |
 94%
From NCERT
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