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:
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 |
67%
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What would be true for the sequence of events shown in the given diagram:
| I: | The whole scheme of transfer of electrons, starting from the PS II, uphill to the acceptor, down the electron transport chain to PS I, excitation of electrons, transfer to another acceptor, and finally down-hill to NADP+ reducing it to NADPH + H+ is called the Z scheme. |
| II: | The electrons that are moved from photosystem II get replaced by electrons available due to splitting of water. |
| 1. Only I | 2. Only II |
| 3. Both I and II | 4. Neither I nor II |
Subtopic: Photosystems | Light Reaction: Electron Transport |
89%
From NCERT
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What would be true for the events shown in the given diagram?
| I: | A possible location where this could be happening is in the stroma lamellae. |
| II: | While the membrane or lamellae of the grana have both PS I and PS II, the stroma lamellae membranes lack PS II as well as NADP reductase enzyme. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Light Reaction: Photophosphorylation |
85%
From NCERT
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Identify A, B, C and D:
| Characteristics | C3 Plants | C4 Plants |
| Cell type in which the Calvin cycle takes place | A | B |
| Cell type in which the initial carboxylation reaction occurs | C | D |
| A | B | C | D | |
| 1. | Mesophyll | Bundle sheath | Mesophyll | Bundle sheath |
| 2. | Bundle sheath | Bundle sheath | Mesophyll | Mesophyll |
| 3. | Bundle sheath | Mesophyll | Mesophyll | Mesophyll |
| 4. | Mesophyll | Bundle sheath | Mesophyll | Mesophyll |
Subtopic: Dark Reaction : Calvin Cycle | C4 Cycle (Hatch & Slack Pathway) |
68%
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Following crops have been extensively cultivated in CO2 rich atmosphere for higher yield:
| 1. | Sugar beet and Cabbage | 2. | Carrots and Tomatoes |
| 3. | Wheat and Sugar beet | 4. | Tomatoes and Bell pepper |
Subtopic: Factors Affecting Photosynthesis |
83%
From NCERT
NEET - 2022
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Assertion: Cyclic pathway of photosynthesis first appeared in some eubacterial species
Reason: Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Reason: Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Subtopic: Historical View: Experiments |
57%
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Assertion: The efficiency of C4 - plants is more than those of C3 - plants
Reason: C4 - plants are more efficient in picking \(CO_2\)
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Reason: C4 - plants are more efficient in picking \(CO_2\)
1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false
Subtopic: C4 Cycle (Hatch & Slack Pathway) | Photorespiration |
72%
From NCERT
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Identify the correct statements regarding chemiosmotic hypothesis:
Choose the correct answer from the options given below:
| (a) | Splitting of the water molecule takes place on the inner side of the membrane. |
| (b) | Protons accumulate within the lumen of the thylakoids. |
| (c). | The primary acceptor of electrons transfers the electrons to an electron carrier. |
| (d) | NADP reductase enzyme is located on the stroma side of the membrane. |
| (e) | Protons increase in number in stroma. |
Choose the correct answer from the options given below:
| 1. | (a), (b) and (e) | 2. | (a), (b) and (d) |
| 3. | (b), (c) and (d) | 4. | (b), (c) and (e) |
Subtopic: Chemiosmotic hypothesis |
75%
From NCERT
NEET - 2022
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When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
1. 1 ATP + 1 NADPH
2. 1 ATP + 2 NADPH
3. 2 ATP + 1 NADPH
4. 2 ATP + 2 NADPH
Subtopic: Dark Reaction : Calvin Cycle |
From NCERT
NEET - 2022
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Water affects the process of photosynthesis in higher plants because:
| I: | Water stress can cause the stomata to close, hence, reducing the carbon dioxide availability. |
| II: | Water stress also makes leaves wilt, thus, reducing the surface area of the leaves and their metabolic activity as well. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Factors Affecting Photosynthesis |
93%
From NCERT
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