In C${}_4$ plants CO${}_2$ are reduced into sugar is : 

1. Mesophyll cells

2. In bundle sheath cells

3. In spongy parenchyma

4. Both A & B

Observe the following diagram given below:

Which statement is correct for this?

1. Photosynthetic decarboxylation takes place in mesophyll cell

2. ${\mathrm{C}}_3$ acid is transported from mesophyll to bundle sheath cell

3. ${\mathrm{O}}_2$ evolve only in mesophyll cell

4. ${\mathrm{CO}}_2$ refixation occurs in mesophyll cell

The thylakoid membrane bears several ${\mathrm{F}}_0-{\mathrm{F}}_1$ particle ATPase/ATP synthase. Which of the following is incorrect for these particles?

1. Once of its part $\left({\mathrm{F}}_0\right)$ is embedded in the membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane

2. Its other part $\left({\mathrm{F}}_1\right)$ protrudes out facing towards the stroma

3. The catalytic sites for ATP formation are located in ${\mathrm{F}}_1$ part

4. ${\mathrm{F}}_1$ is intrinsic protein

Which one is the correct sequence of electron transport from PS-II to PS-I ?

1. P680–PQ–Cytochrome f–Plastocynine–P700 
2. P680–Cytochrome f–PQ–Plastocynine–P700
3. P680–Plastocynins–PQ–Cytochrom f–P700
4. P700–PQ–Cytochrom f–Plastocyninn–P680

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:

At low light condition, which of the following plants respond to high $C{O}_2$ conditions ?

1. Only $C_3$ plants

2. Only $C_4$ plants

3. Neither $C_3 nor C_4$ plants

4. Both $C_{3}and C_4$ plants

PS II is not found involved in

1. Non-cyclic photophosphorylation

2. Cyclic photophosphorylation

3. Photolysis of H₂O

4. Formation of NADPH 

The energy required for ATP synthesis in PS II comes from

(1) Proton gradient
(2) Electron gradient
(3) Reduction of glucose
(4) Oxidation of glucose

Select the incorrect statement.

1. Carotenoids protect the plant from excessive heat and prevent photo-oxidation of chlorophyll pigments

2. All pigments other than chlorophyll a are called accessory pigments

3. The electrons removed from PS II are never replaced

4. Cyclic photophosphorylation occurs mostly in stroma lamellae membrane

Identify ‘A’ with respect to ATP synthesis through chemiosmosis.

1. Cytochromes b and f

2. Cytochrome a and a₃

3. Cytochrome bc₁

4. NADP reductase