Q. No.Consider the given two statements:
| Statement I: | Water molecules appear on both side of the equation for photosynthesis in higher plants. |
| Statement II: | The water molecules that enter the reaction are not the same molecules that emerge from the reaction. |
| 1. | Both Statement I and Statement II are correct and Statement II explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not explain Statement I |
| 3. | Statement I is correct and Statement II is incorrect |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Introduction |
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Joseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants. Priestley observed that a candle burning in a closed space – a bell jar, soon gets extinguished (Figure a, b, c, d). Similarly, a mouse would soon suffocate in a closed space. He concluded that a burning candle or an animal that breathe the air, both somehow, damage the air. But when he placed a mint plant in the same bell jar, he found that the mouse stayed alive and the candle continued to burn.
The conclusions that can be drawn from these experiments will be:
The conclusions that can be drawn from these experiments will be:
| I: | Plants restore to the air whatever breathing animals and burning candles remove. |
| II: | Sunlight is essential to the plant process that somehow purifies the air fouled by burning candles or breathing animals. |
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
Subtopic: Historical View: Experiments |
68%
From NCERT
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What conclusions can be drawn from the Moll’s half leaf experiment [the given diagram shows the schematic representation of the experiment]?
What can be said after observing the results of the experiment?
| I: | Negative starch test by the leaf portion present inside the bottle indicates CO 2 is necessary for this process. |
| II: | Negative test of starch, which is also shown by the portion of the leaf present in between the split of the split cork is due to the lack of CO 2 and light, thus indicating that both of them are essential requirements. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | None |
Subtopic: Historical View: Experiments |
65%
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The Engelmann experiment shown in the given diagram helped to understand the relationship between:
| 1. | bacteria and the alga used in the experiment. |
| 2. | the rate of respiration in aerobic bacteria and wavelengths of light. |
| 3. | wavelengths of light and the oxygen released during photosynthesis. |
| 4. | rates of oxygen liberation by alga and carbon dioxide liberated by the bacteria. |
Subtopic: Pigments |
68%
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When do you think the chloroplasts will be aligned with their flat surfaces parallel to the walls of the mesophyll cells?
| 1. | In dark |
| 2. | When light intensity is low |
| 3. | When light intensity is high |
| 4. | They are always aligned parallel to the walls |
Subtopic: Chloroplast Structure |
55%
From NCERT
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Study the given diagram where ‘X’ represents the absorption spectrum of chlorophyll a and ‘Y’ represents the action spectrum of photosynthesis. The conclusions that can be drawn include:
| I: | Chlorophyll a is the main pigment in photosynthesis. |
| II: | Violet-Blue and Red wavelengths are very effective for photosynthesis. |
| III: | Chlorophyll a is the only pigment capable of absorbing light. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Pigments |
80%
From NCERT
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The relationship between photosynthesis and respiration can be best described as:
| 1. | Photosynthesis and respiration are reversal of each other in biochemical pathways. |
| 2. | Photosynthesis stores energy in complex organic molecules, while respiration releases it. |
| 3. | Respiration occurs only in animals and photosynthesis occurs only in plants. |
| 4. | Respiration results in formation of ATP but photosynthesis can only use them. |
Subtopic: Introduction |
69%
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The correct statements about photosynthesis include:
| I: | the light-dependent reactions can occur only in the light, the light-independent reactions only in the dark |
| II: | photorespiration is more efficient at producing glucose than is photosynthesis |
| III: | the light-dependent reactions produce the energy-rich compounds that are used to run the light-independent reactions |
| 1. | I only | 2. | III only |
| 3. | I and III only | 4. | II and III only |
Subtopic: Light Reaction: Electron Transport | Dark Reaction: Biosynthetic Phase | Light Reactions |
80%
From NCERT
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The splitting of water during oxygenic photosynthesis in higher plants:
| I: | is associated with PS II |
| II: | releases one molecule of oxygen on splitting of two water molecules |
| III: | releases protons and oxygen in the thylakoid lumen |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Light Reactions |
75%
From NCERT
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Consider the following two statements and choose the correct response from the options given below:
| I: | Protons and oxygen formed by splitting of water are released in the lumen of thylakoid. |
| II: | PS II is physically located on the inner side of the membrane of the thylakoid. |
| 1. | Both I and II are true and II explains I |
| 2. | Both I and II are true but II does not explain I |
| 3. | I is true and II is false |
| 4. | I is false and II is true |
Subtopic: Light Reaction: Electron Transport |
54%
From NCERT
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