Photosynthesis in Higher Plants — Page 6 | NEET Biology

Q51

Which one occurs both during cyclic and noncyclic modes of photophosphorylation?

A Involvement of both PS I and PS II

B Formation of ATP

C Release of O2

D Formation of NADPH

Correct Answer

Option B

Solution

(b) ATP is formed in both cyclic and non-cyclic photophosphorylation.

Q52

Pigment acting as a reaction centre during photosynthesis is

A Carotene

B Phytochrome

C P700

D Cytochrome

Correct Answer

Option C

Solution

(c) P700 (PS I) and P680 (PS II) are reaction centre pigments.

Q53

NADPH is generated through

A photosystem I

B photosystem II

C anaerobic respiration

D glycolysis

Correct Answer

Option A

Solution

(a) NADPH is generated at PS I during non-cyclic photophosphorylation.

Q54

Which pigment system is inactivated in red drop?

A PS I and PS II

B PS-I

C PS-II

D None of these

Correct Answer

Option C

Solution

(c) Red drop occurs at wavelengths >680 nm where PS II activity decreases.

Q55

In photosystem I the first electron acceptor is

A Cytochrome

B Plastocyanin

C An iron-sulphur protein

D Ferredoxin

Correct Answer

Option C

Solution

(c) The first electron acceptor in PS I is an iron-sulphur protein complex (A0/A1).

Q56

Electrons from excited chlorophyll molecule of photosystem II are accepted first by

A Cytochrome-b

B Cytochrome-f

C Quinone

D Ferredoxin

Correct Answer

Option C

Solution

(c) Pheophytin and then plastoquinone (quinone) are the first electron acceptors from excited PS II.

Q57

The oxygen evolved during photosynthesis comes from water molecules. Which pair of elements is involved in this reaction?

A Manganese and Potassium

B Magnesium and Molybdenum

C Magnesium and Chlorine

D Manganese and Chlorine

Correct Answer

Option D

Solution

(d) Mn2+ and Cl- are required for photolysis of water in the oxygen-evolving complex.

Q58

In light reaction, plastoquinone facilitates the transfer of electrons from

A Cytb6 complex to PS-I

B PS-I to NADP

C PS-I to ATP synthase

D PS-II to Cytb6f complex

Correct Answer

Option D

Solution

(d) Plastoquinone transfers electrons from PS-II to the Cytb6f complex.

Q59

In C4 plants, Calvin cycle operates in

A Stroma of bundle sheath chloroplasts

B Grana of bundle sheath chloroplasts

C Grana of mesophyll chloroplasts

D Stroma of mesophyll chloroplasts

Correct Answer

Option A

Solution

(a) Calvin cycle (C3 cycle) operates in the stroma of bundle sheath chloroplasts in C4 plants.

Q60

The substrate for photorespiration is

A Phosphoglyceric acid

B Glycolate

C Serine

D Glycine

Correct Answer

Option B

Solution

(b) Glycolate is the primary substrate and metabolite of photorespiration.