Photosynthesis in Higher Plants · Question 25

Which of the following statements is incorrect?

1. Cyclic photophosphorylation involves both PS I and PS II
2. Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation.
3. Stroma lamellae have PS I only and lack NADP reductase
4. Grana lamellae have both PS I and PS II

In light reaction, plastoquinone facilitates the transfer of electrons from

1. PS-I to ATP synthase
2. Cytb6f complex to PS-I
3. PS-I to NADP+
4. PS-II to Cytb6f complex

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

1. 1 molecule of 3-C compound and 1 molecule of 2-C compound
2. 1 molecule of 3-C compound
3. 1 molecule of 6-C compound
4. 2 molecules of 3-C compound

Oxygen is not produced during photosynthesis by

1. Cycas
2. Green sulphur bacteria
3. Chara
4. Nostoc

Which of the following is not a product of light reaction of photosynthesis?

1. Oxygen
2. NADH
3. ATP
4. NADPH

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.
2. C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.
3. Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield.
4. Light saturation for CO2 fixation occurs at 10% of full sunlight.

Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in

1. C4 plants
2. C2 plants
3. C3 and C4 plants
4. C3 plants

In a chloroplast the highest number of protons are found in

1. intermembrane space
2. antennae complex
3. stroma
4. lumen of thylakoids.

Emerson's enhancement effect and Red drop have been instrumental in the discovery of

1. photophosphorylation and cyclic electron transport
2. oxidative phosphorylation
3. photophosphorylation and non-cyclic electron transport
4. two photosystems operating simultaneously.

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

1. CAM
2. Nitrogen fixer
3. C3
4. C4