Photosynthesis in Higher Plants — Page 2 | NEET Biology

Q11

Which one of the following statements about cytochrome P-450 is wrong?

A It contains iron

B It is an enzyme involved in oxidation reaction

C It is a coloured cell

D It has an important role in metabolism

Correct Answer

Option C

Solution

(c) Cytochrome P-450 is an enzyme/protein, not a cell.

Q12

Oxygen is not produced during photosynthesis by

A Green sulphur bacteria

B Nostoc

C Chara

D Cycas

Correct Answer

Option A

Solution

(a) Green sulphur bacteria use H2S not H2O — no O2 evolution (anoxygenic).

Q13

In Hatch and Slack pathway, the primary CO2 acceptor is

A Rubisco

B Oxaloacetic acid

C Phosphoglyceric acid

D Phosphoenol pyruvate

Correct Answer

Option D

Solution

(d) PEP (phosphoenolpyruvate) is the primary CO2 acceptor in C4 (Hatch-Slack) pathway.

Q14

NADP+ is reduced to NADPH in

A PS I

B PS II

C Calvin cycle

D Noncyclic photophosphorylation

Correct Answer

Option D

Solution

(d) NADP+ is reduced to NADPH during non-cyclic photophosphorylation at PS I.

Q15

Most plants are green in colour because

A the atmosphere filters out all colours except green

B green light is most effective for photosynthesis

C chlorophyll is least effective in absorbing green light

D green light allows maximum photosynthesis

Correct Answer

Option C

Solution

(c) Chlorophyll reflects green light as it absorbs red and blue light.

Q16

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

A photophosphorylation and non-cyclic electron transport

B two photosystems operating simultaneously

C photophosphorylation and cyclic electron transport

D oxidative phosphorylation

Correct Answer

Option B

Solution

(b) Emerson's experiments proved two photosystems (PS I and PS II) operate in photosynthesis.

Q17

The carbon dioxide acceptor in Calvin cycle / C3 plants is

A Phospho-enol pyruvate (PEP)

B Ribulose 1,5-diphosphate (RuBP)

C Phosphoglyceric acid (PGA)

D Ribulose monophosphate (RMP)

Correct Answer

Option B

Solution

(b) RuBP is the CO2 acceptor in C3 plants.

Q18

The wavelength of light absorbed by Pr form of phytochrome is

A 680 nm

B 720 nm

C 620 nm

D 640 nm

Correct Answer

Option A

Solution

(a) Pr form absorbs red light at ~660-680 nm and converts to Pfr.

Q19

In C4 plants, CO2 is fixed in mesophyll cells by combining with

A RuBP

B PEP

C OAA

D Pyruvate

Correct Answer

Option B

Solution

(b) In C4 mesophyll cells, CO2 combines with PEP (via PEP carboxylase) to form OAA.

Q20

The immediate electron donor to P700+ (Photo system I) in Z-scheme is

A Plastoquinone

B Plastocyanin

C Ferredoxin

D Cytochrome f

Correct Answer

Option B

Solution

(b) Plastocyanin donates electrons to P700+ in photosystem I.