Photosynthesis in Higher Plants — Page 3 | NEET Biology

Q21

The enzyme which fixes CO2 in C4 plants is

A Hydrogenase

B PEP carboxylase

C Reductase

D RuBP carboxylase

Correct Answer

Option B

Solution

(b) PEP carboxylase fixes CO2 in C4 mesophyll cells.

Q22

Chlorophyll in chloroplasts is located in

A grana

B pyrenoid

C stroma

D both grana and stroma

Correct Answer

Option A

Solution

(a) Photosynthetic pigments (chlorophylls) are embedded in the thylakoid membranes of grana.

Q23

Which pigment absorbs the red and far-red light?

A Carotenoids

B Cytochromes

C Phytochrome

D Chlorophyll a

Correct Answer

Option C

Solution

(c) Phytochrome is a photoreceptor pigment that absorbs red (660nm) and far-red (730nm) light.

Q24

Z-scheme of light reactions was proposed by

A Arnon

B Hill

C Emerson

D Hill and Bendall

Correct Answer

Option D

Solution

(d) Z-scheme (describing non-cyclic electron transport) was proposed by Hill and Bendall (1960).

Q25

The carbon dioxide acceptor in C3 plants is

A PEP

B RuBP

C OAA

D Malic acid

Correct Answer

Option B

Solution

(b) In C3 plants, RuBP (ribulose-1,5-bisphosphate) is the CO2 acceptor via RuBisCO.

Q26

Haatch and Slack pathway operates in

A C3 plants

B CAM plants

C C4 plants

D All plants

Correct Answer

Option C

Solution

(c) Hatch-Slack pathway is the C4 pathway operating in C4 plants.

Q27

In photosynthesis, the light-independent reactions take place in

A thylakoid membrane

B thylakoid lumen

C stroma of the chloroplast

D outer membrane of chloroplast

Correct Answer

Option C

Solution

(c) Light-independent (Calvin cycle / dark) reactions occur in the stroma.

Q28

Emerson enhancement effect proves that

A Cyclic photophosphorylation requires only one photosystem

B Two photosystems are present in chloroplasts

C Oxygen evolving complex is associated with PS I

D C4 plants have kranz anatomy

Correct Answer

Option B

Solution

(b) Emerson enhancement effect (synergistic increase in photosynthesis using 2 wavelengths) proved 2 photosystems.

Q29

One molecule of CO2 is fixed in the Calvin cycle, and how many molecules of ATP and NADPH are used to produce one molecule of G3P?

A 2 ATP, 2 NADPH

B 3 ATP, 2 NADPH

C 2 ATP, 3 NADPH

D 3 ATP, 3 NADPH

Correct Answer

Option B

Solution

(b) For each CO2 fixed: 3 ATP + 2 NADPH are consumed per G3P molecule.

Q30

In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in

A epidermal cells

B mesophyll cells

C bundle sheath

D guard cells

Correct Answer

Option B

Solution

(b) In C4 plants malic acid synthesis occurs in mesophyll cells.