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Given below are two statements:
Assertion (A):
In green plants, H2O is hydrogen donor and oxidised to O2.
Reason (R):
Splitting of water molecules take place on the outer side of the thylakoid membrane.
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: Historical View: Experiments | Chemiosmotic hypothesis |
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Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Carboxylation is the most crucial step of Calvin cycle. |
| Reason (R): | This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA |
| 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: Dark Reaction : Calvin Cycle |
65%
Level 2: 60%+
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Which reagent can be used to determine the essentiality of CO2 for the process of photosynthesis.
1. KOH
2. K2Cr2O7
3. Starch
4. Iodine tincture
1. KOH
2. K2Cr2O7
3. Starch
4. Iodine tincture
Subtopic: Historical View: Experiments |
90%
Level 1: 80%+
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Identify the incorrectly matched pair w.r.t. the experimental material used by the scientist.
| 1. | Joseph Priestley - Neem Plant |
| 2. | Jan Ingenhousz - Aquatic plant |
| 3. | TW Engelmann - Cladophora |
| 4. | Cornelius van Niel - Purple & green bacteria |
Subtopic: Historical View: Experiments |
87%
Level 1: 80%+
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Which of the following scientists discovered oxygen?
1. Joseph Priestley
2. Jan Ingenhousez
3. Cornelius van Niel
4. T.W. Engelmann
1. Joseph Priestley
2. Jan Ingenhousez
3. Cornelius van Niel
4. T.W. Engelmann
Subtopic: Historical View: Experiments |
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In the experiment conducted by T.W. Engelmann aerobic bacteria were used.
| 1. | To determine the action spectrum |
| 2. | To determine the absorption spectrum of chlorophyll. |
| 3. | To detect the sites of oxygen (O2) evolution. |
| 4. | To detect the oxidizing species in the photosynthetic reactants. |
Subtopic: Historical View: Experiments |
52%
Level 3: 35%-60%
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Which alignment of chloroplasts in mesophyll cell will allow to get optimum quantity of the incident light?
| 1. | Away from the wall |
| 2. | Across the wall |
| 3. | Along the wall |
| 4. | Perpendicular to the wall |
Subtopic: Chloroplast Structure |
70%
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The fluid component of chloroplast associated with
| 1. | Photochemical reactions |
| 2. | Light - dependent reactions |
| 3. | ATP - synthesizing reactions |
| 4. | Biosynthetic reactions |
Subtopic: Chloroplast Structure |
55%
Level 3: 35%-60%
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Which of the following effects will be observed if the plant is exposed only to red light which was earlier given blue light?
| 1. | Increase in rate of photosynthesis |
| 2. | Decrease in rate of photosynthesis |
| 3. | Firstly, decrease in rate of photosynthesis then increase |
| 4. | No photosynthesis takes place |
Subtopic: Pigments |
60%
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Which of the following is true about chlorophyll b?
| 1. | Serves as major primary pigment in the photosynthetic machinery |
| 2. | Forms the reaction center only |
| 3. | Prevent reaction center from photo-oxidation |
| 4. | Show blue color in chromatogram |
Subtopic: Pigments |
83%
Level 1: 80%+
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