Q. No.In the leaves of C4 -plants, malic acid synthesis during CO2 fixation occurs in
1. epidermal cells
2. mesophyll cells
3. bundle sheath
4. guard cells
1. epidermal cells
2. mesophyll cells
3. bundle sheath
4. guard cells
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Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material?
| A. | Easily translocated |
| B. | Chemically non-reactive |
| C. | Easily digested by animals |
| D. | Osmotically inactive |
| E. | Synthesized during photosynthesis |
The useful properties are
| 1. | (B) and (C) |
| 2. | (B) and (D) |
| 3. | (A), (C) and (E) |
| 4. | (A) and (E) |
The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is :
| 1. | cytochrome | 2. | iron-sulphur protein |
| 3. | ferredoxin | 4. | quinone |
In photosystem-I, the first electron acceptor is :
| 1. | ferredoxin | 2. | cytochrome |
| 3. | plastocyanin | 4. | an iron-sulphur protein |
During photorespiration, the oxygen consuming reaction(s) occur in :
1. stroma of chloroplasts and mitochondria
2. stroma of chloroplasts and peroxisomes
3. grana of chloroplasts and peroxisomes
4. stroma of chloroplasts
The first step for initiation of photosynthesis will be
| 1. | Photolysis of water |
| 2. | Excitement of chlorophyll molecule due to absorption of light |
| 3. | ATP formation |
| 4. | Glucose formation |
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In sugarcane plant,CO214 is fixed in malic acid in which the enzyme that fixes CO2 is
1. Ribulose biphosphate carboxylase
2. Phosphoenol pyruvic acid carboxylase
3. Ribulose phosphate kinase
4. Fructose phosphatase
As compared to a C3 plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4 plants ?
| 1. | Zero | 2. | Six |
| 3. | Two | 4. | Twelve |
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
| 1. | The primary fixation of CO2 is mediated via PEP carboxylase. |
| 2. | Effective pumping of CO2 into bundle sheath cells. |
| 3. | Four carbon acids are the primary initial CO2 fixation products. |
| 4. | RuBisCO in C4 plants has higher affinity for CO2. |
During photorespiration, the oxygen consuming reaction (s) occur in
1. Stroma of chloroplasts and mitochondria
2. Stroma of chloroplasts and peroxisomes
3. Grana of chloroplasts and peroxisomes
4. Stroma of chloroplasts
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