Q. No.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
Identify the correct relationship between photosynthesis and cellular respiration:
| 1. | while only autotrophs photosynthesize, only heterotrophs respire |
| 2. | while photosynthesis uses solar energy to convert inorganics to energy-rich organics, respiration breaks down energy-rich organics to synthesize ATP |
| 3. | photosynthesis occurs in day time and respiration at night |
| 4. | ATP cannot be formed during photosynthesis, it can only be formed in cellular respiration. |
The absorption spectrum shown in the given figure can be of:
1. Chlorophyll a
2. Chlorophyll b
3. Carotenoids
4. Either 1 or 2
Identify the incorrect statement regarding non-cyclic photophosphorylation:
| 1. | Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane. |
| 2. | The photosystem II complex replaces its lost electrons from an external source. |
| 3. | It generates both ATP and NADPH |
| 4. | When the chloroplast runs low on ATP for the Calvin cycle, the plant may shift from cyclic to non-cyclic electron flow. |
Identify the incorrect statement regarding the light independent reactions in photosynthesis:
| 1. | These reactions occur in the stroma. |
| 2. | They use the products (ATP and NADPH) of light-dependent reactions. |
| 3. | They occur in the absence of light and hence are called the dark reactions. |
| 4. | The three phases are carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. |
The number of electrons that need to be transported during cyclic photophosphorylation in sulphur bacteria, to produce one molecule of ATP is:
1. one
2. two
3. three
4. four
The antenna pigment molecules:
| 1. | are responsible for photolysis of water to release oxygen |
| 2. | harvest photons and transfer light energy to the reaction-center chlorophyll |
| 3. | transfer electrons to chlorophyll a |
| 4. | transfer electrons to ferredoxin and then NADPH |
The number of turns of Calvin cycle required to produce one molecule of Glyceraldehyde 3 Phosphate is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 6 |
The light independent reactions are seen in:
| I. | C3 carbon fixation |
| II. | C4 carbon fixation |
| III. | Crassulacean acid metabolism |
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
In the light dependent reactions of photosynthesis:
| 1. | NADPH is reduced to NADP+ by the enzyme NADP reductase |
| 2. | initial carbon fixation takes place forming a 3 carbon compound. |
| 3. | ATP is not produced. |
| 4. | light is absorbed and energy is transported to reaction-center chlorophyll a |
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