Mark the odd one (with respect to internal factors affecting photosynthesis)

1. Amount of chlorophyll

2. Light intensity

3. Mesophyll cells

4. Orientation of leaves

Select the incorrect match from the following

1. One Calvin cycle – Requires 3 ATP and 2 NADPH
2. ${\mathrm{C}}_4$ plant – Shows slower process of carbon fixation
3. ${\mathrm{C}}_3$ plants – 20-25°C is optimum for photosynthesis
4. Hatch and Slack – Primary ${\mathrm{CO}}_2$ acceptor pathway is phosphoenolpyruvate

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 

Cyclic photophosphorylation is different from non-cyclic photophosphorylation as the former

1. Is performed by a collaboration of both PS-II and PS-I

2. Does not require any external source of electrons

3. Is connected with photolysis of water

4. Is connected with ATP and NADPH production

In C₄ plants, PEP carboxylase and RuBisCO enzymes are present respectively in

1. Stroma and Grana

2. Thylakoid and Stroma

3. Stroma and Stroma

4. Stroma and Cytosol

The reaction centre with respect to cyclic photophosphorylation is

1. P₇₀₀

2. P₆₈₀

3. P₅₄₀

4. P₆₆₀

PEP is primary CO₂ acceptor in

1.  C₄ plants

2.  C₃ plants

3.  C₂ plants

4.  both C₃ and C₄ plants

Splitting of water is associated with

1.  photosystem I

2.  lumen of thylakoid

3.  both photosystems I and II

4.  inner side of thylakoid membrane

The reaction that is responsible for the primary fixation of CO₂ is catalysed by

1.  RUBP carboxylase

2.  PEP carboxylase

3.  RuBP carboxylase and PEP carboxylase

4.  PGA synthase

When CO₂ is added to PEP, the first stable product synthesized is

1. pyruvate

2. glyceraldehyde-3-phosphate

3. phosphoglycerate

4. oxaloacetate