Where does oxygen come from during photosynthesis?
1. Oxidation of water
2. Oxidation of glucose
3. Reduction of glucose
4. From CO₂

Stroma lamella in plastid lacks

1. PS II and PS I.
2. PS II and NADP reductase.
3. PS I and NAD reductase.
4. PS II only.

According to the chemiosmotic hypothesis, there is a basic difference between respiration and photosynthesis. This is _____

1. In chloroplast, H+ accumulation takes place in the lumen of thylakoid but in mitochondria, this takes place in perimitochondrial space.

2. Accumulation of H+ in chloroplast takes place in matrix i.e., stroma and in mitochondria, this takes place in cristae.

3. In both the mitochondria and chloroplast the accumulation of H+ takes place in inter-membranous space but with a high rate in mitochondria

4. Both 1 and 3 are correct.

Study the pathway ATP synthesis through chemiosmosis given below –

In which of the following options correct words for all the three blanks A, B, C and D are indicated –

1. A – F₁, B – Thylakoid membrane, C – Photosystem (I), D – Photosystem (II)
2. A – F₀, B – Thylakoid membrane, C – Photosystem (I), D – Photosystem (II)
3. A – F₁, B – Thylakoid membrane, C – Photosystem (II), D – Photosystem (I)
4. A – F₀, B – Thylakoid membrane, C – Photosystem (II), D – Photosystem (I)

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

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

In plant cells, synthesis of ATP by the chemiosmotic
mechanism occurs during
1. Photosynthesis only.
2. Respiration only.
3. Both photosynthesis and respiration. 
4. Photorespiration only.

Chemiosmosis (related with respiration, photosynthesis ETS) does not require
1. Membrane, a proton pump.
2. ATP.
3. A proton gradient.
4. ATPase.

Proton gradient develops across the thylakoid membrane due to all, except
1. Splitting of water towards lumen side
2. NADP⁺ reduction towards stroma side
3. Movement of protons from lumen to stroma side by PQ
4. Release of H⁺ from stroma to lumen side by a H-carrier

Select the Incorrect statement from the following.

1. Nostoc performs oxygenic photosynthesis.

2. During photorespiration, O${}_2$ is first utilized in chloroplast, and CO${}_2$ is released in mitochondria.

3. In a chloroplast, lumen of thylakoids always have least number of protons during
photophosphorylation .

4. In the plants like sugarcane and Amaranthus, primary CO${}_2$ acceptor is phosphoenol pyruvate.