The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:
1. | 1 molecule of the 3-C compound |
2. | 1 molecule of the 6-C compound |
3. | 1 molecule of a 4-C compound and 1 molecule of the 2-C compound |
4. | 2 molecules of the 3-C compound |
During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?
1. | Oxygen | 2. | Water |
3. | Carbon dioxide | 4. | Light |
Which of the following statements is incorrect?
1. | RuBisCO is a bifunctional enzyme |
2. | In C4 plants, the site of RuBisCO activity is mesophyll cell |
3. | The substrate molecule for RuBisCO activity is a 5-carbon compound |
4. | RuBisCO action requires ATP and NADPH |
One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of:
1. Violet and green light
2. Indigo and green light
3. Orange and yellow light
4. Blue and red light
In Hatch and Slack pathway, the primary CO2 acceptor is -
1. Oxaloacetic acid
2. Phosphoglyceric acid
3. Phosphoenol pyruvate
4. Rubisco
Study the pathway given below:
In which of the following options, correct words for all the three blanks A, B and C are indicated?
A | B | C | |
1. | Fixation | Transamination | Regeneration |
2. | Fixation | Decarboxylation | Regeneration |
3. | Carboxylation | Decarboxylation | Reduction |
4. | Decarboxylation | Reduction | Regeneration |
Read the following four statements A, B, C and D and select the right option having both correct statements:
STATEMENTS:
(A) | Z-scheme of light reaction takes place in the presence of PSI only |
(B) | Only PSI functional in cyclic photophosphorylation |
(C) | Cyclic photophosphorylation results in a synthesis of ATP and NADPH2 |
(D) | Stroma lamellae lack PSII as well as NADP |
Options:
1. A and B
2. B and C
3. C and D
4. B and D
In Kranz anatomy, the bundle sheath cells have:
1. | thick walls, many intercellular spaces and few chloroplasts |
2. | thin walls, many intercellular spaces and no chloroplasts |
3. | thick walls, no intercellular spaces and a large number of chloroplasts |
4. | thin walls, no intercellular spaces and several chloroplasts |
Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on:
1. Membrane potential
2. Accumulation of K ions
3. Proton gradient
4. Accumulation of Na ions
Photosynthesis in C4 plants is relatively less limited by atmospheric 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 a higher affinity for CO2 |