Assertion(A):
In C4 plants, photorespiration does not occur.
Reason(R):
They have a mechanism that increases the concentration of CO2 at the enzyme site.
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: Question on C4 Pathway |
92%
Level 1: 80%+
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| 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 |
64%
Level 2: 60%+
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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 |
Level 3: 35%-60%
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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 |
62%
Level 2: 60%+
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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%
Level 1: 80%+
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| Assertion(A): | Oxygen evolved from green plants actually comes from the water molecule. |
| Reason(R): | This was proved using radioisotope techniques. |
| 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: Historical View: Experiments |
50%
Level 3: 35%-60%
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| Assertion (A): | Photorespiration decreases the rate of photosynthesis. |
| Reason (R): | RUBISCO can also behave as an oxygenase |
| 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. | Both (A) and (R) are false. |
Subtopic: Photorespiration | Factors Affecting Photosynthesis |
Level 3: 35%-60%
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Consider the given two statements:
| Assertion (A): | Chief photosynthetic pigment is chlorophyll a but plants evolved some other pigments also. |
| Reason (R): | Photosynthetic efficiency is increased due to absorptions of variety of wavelengths. |
| 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 Correct. |
Subtopic: Pigments |
68%
Level 2: 60%+
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Match the name of the scientist in Column I with his contribution in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A. | Julius von Sachs | P. | O2 evolved by the green plant comes from H2O |
| B. | T.W. Engelmann | Q. | Glucose is usually stored as starch by plants |
| C. | Cornelius van Niel | R. | Sunlight is essential for photosynthesis |
| D. | Jan Ingenhousz | S. | First action spectrum of photosynthesis |
| A | B | C | D | |
| 1. | Q | S | P | R |
| 2. | Q | R | P | S |
| 3. | P | Q | R | S |
| 4. | P | S | R | Q |
Subtopic: Historical View: Experiments |
89%
Level 1: 80%+
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At low light conditions, which of the following groups of plants responds to high CO2 conditions?
| 1. | C3 | 2. | C4 |
| 3. | Both C3 and C4 | 4. | Neither C3 nor C4 |
Subtopic: Factors Affecting Photosynthesis |
56%
Level 3: 35%-60%
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