Molecular formula of chlorophyll- $b$ is

$\mathrm{C}_{55} \mathrm{H}_{72} \mathrm{O}_5 \mathrm{~N}_4 \mathrm{Mg}$

$\mathrm{C}_{55} \mathrm{H}_{70} \mathrm{O}_5 \mathrm{~N}_4 \mathrm{Mg}$

$\mathrm{C}_{54} \mathrm{H}_{70} \mathrm{O}_6 \mathrm{~N}_4 \mathrm{Mg}$

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NEET • BIOLOGY • PHOTOSYNTHESIS IN HIGHER PLANTS

Photosynthesis in higher plants practice · Hard

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Showing 1-30 of 50 questions

1 Hard

1 of 50

Understanding +4 | -1

Energy required for ATP synthesis in PS – II comes from?

View answer and explanation

Correct option: A

Proton gradient

Option A (Proton gradient) is correct because the energy required for ATP synthesis in PS-II (and generally in chloroplasts) comes from the proton gradient established across the thylakoid membrane.

2 Hard

2 of 50

Understanding +4 | -1

The

{C_4}

plants are photosynthetically more efficient than

{C_3}

plants because:

View answer and explanation

Correct option: B

C{O_2}

generated during photorespiration is trapped and recycled through PEP carboxylase

Option B is correct because

{C_4}

plants recycle

C{O_2}

from photorespiration, concentrating it around RuBisCO and minimizing wasteful oxygenation.

3 Hard

3 of 50

Analyzing +4 | -1

Identify the incorrect statements among the following

I. When only PS I is functional, cyclic flow of electrons is not possible

II. The breakdown of the gradient provides enough to make the enzyme synthesis

III. The NADP reductase enzyme is located of the thylakoid membrane

IV. Proton gradient increases due to

\mathrm{PC}

and Cyt

f

View answer and explanation

Correct option: B

I, III, IV

Option A (I, II, III) is correct because statements I, II, and III are incorrect regarding cyclic electron flow, gradient breakdown, and NADP reductase location.

4 Hard

4 of 50

Analyzing +4 | -1

The ratio between 2-carbon and 3-carbon intermediates having

– NH_2

group formed in photosynthetic oxidation cycle is

View answer and explanation

Correct option: B

2:1

Option B (2:1) is correct because in the photorespiratory pathway, two molecules of glycine (2-C) are converted to one molecule of serine (3-C). Both glycine and serine contain an -NH2 group.

5 Hard

5 of 50

Understanding +4 | -1

Assertion (A):

\mathrm{C}_4

plants can tolerate high temperature conditions.

Reason (R): Enzyme pepcase and PPDK work only on high temperature.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because C4 plants can tolerate high temperatures due to the enzymes PEPcase and PPDK functioning optimally at higher temperatures.

6 Hard

6 of 50

Application +4 | -1

How many ATP and

NADPH_2

are required for production of two sucrose molecules in sugarcane?

View answer and explanation

Correct option: B

120 ATP, 48

NADPH_2

Option B (120 ATP, 48

NADPH_2

) is correct because each sucrose molecule requires 60 ATP and 24 NADPH2, and two sucrose molecules would require double that amount.

7 Hard

7 of 50

Understanding +4 | -1

Assertion (A):

\mathrm{C}_3

plants do not show rise is photosynthesis at higher temperature.

Reason (R): Enzymes of

\mathrm{C}_3

plants are high temperature sensitive as compared to low temperature sensitive enzymes of

\mathrm{C}_4

plants.

View answer and explanation

Correct option: A

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because C3 plants are more sensitive to high temperatures due to their enzymes being less stable at higher temperatures compared to C4 plants.

8 Hard

8 of 50

Analyzing +4 | -1

Find out the incorrect statement from the following.

View answer and explanation

Correct option: D

There is no division of labour in chloroplast

Option D (There is no division of labour in chloroplast) is correct because chloroplasts have a clear division of labor between the thylakoids (light-dependent reactions) and the stroma (light-independent reactions).

9 Hard

9 of 50

Understanding +4 | -1

All of the following statements are true for photorespiration, except

View answer and explanation

Correct option: A

It involves three double membrane bound cell organelles

Option A (It involves three double membrane bound cell organelles) is correct because photorespiration involves only two double membrane bound organelles: chloroplasts and mitochondria. Peroxisomes are single membrane bound organelles.

10 Hard

10 of 50

Understanding +4 | -1

Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves:

View answer and explanation

Correct option: D

Breakdown of electron gradient

Option D (Breakdown of electron gradient) is correct because ATP synthesis through chemiosmosis involves the breakdown of a proton gradient, not an electron gradient.

11 Hard

11 of 50

Understanding +4 | -1

{C_4}

plants are tolerate to saline conditions due to

View answer and explanation

Correct option: A

Occurrence of organic acids

Option A (Occurrence of organic acids) is correct because organic acids help in osmotic adjustment and maintaining cell turgor under saline conditions.

12 Hard

12 of 50

Understanding +4 | -1

Assertion: During the process of photosynthesis amount of organic matter synthesised by producers per unit time and per unit area is referred to as net primary productivity.

Reason: Due to abundance of sunlight primary productivity is usually high and sustained throughout the year in temperate areas.

View answer and explanation

Correct option: D

If both assertion and reason are false

Option D (If both assertion and reason are false) is correct because net primary productivity includes accounting for respiration, and primary productivity is not high and sustained throughout the year in temperate areas due to seasonal changes.

13 Hard

13 of 50

Remembering +4 | -1

In the majority of dicots, the first stable product of photosynthesis during the dark reaction is

View answer and explanation

Correct option: C

3-phosphoglyceric acid

Option C (3-phosphoglyceric acid) is correct because 3-phosphoglyceric acid (3-PGA) is the first stable compound formed in the Calvin cycle in most dicots.

14 Hard

14 of 50

Understanding +4 | -1

Choose the correct statements among the following

(A) Chlorophyll is the major pigment responsible for trapping of light, accessory pigment also participate

(B) In green plants,

\mathrm{H}_2 \mathrm{O}

is the hydrogen donor

(C) In purple sulphur bacteria the oxidation product is carbon

(D) Radioisotope studies proved water as source of

\mathrm{O}_2

release in photosynthesis

View answer and explanation

Correct option: C

A,B, D

Option C is correct because Chlorophyll is the major pigment, water is the hydrogen donor in green plants, and radioisotope studies confirmed water as the source of oxygen.

15 Hard

15 of 50

Understanding +4 | -1

Given below are two statements:
Statement I: The primary

\mathrm{C}{\mathrm{O}_\mathrm{2}}

acceptor in

{\mathrm{C}_\mathrm{4}}

plants phosphoenolpyruvate and is found in the mesophyll cells.
Statement II: Mesophyll cells of

{\mathrm{C}_\mathrm{4}}

plants lack RuBisCo enzyme
In the light of the above statements, choose the correct answer from the options given below:

View answer and explanation

Correct option: B

Both Statement I and Statement II are correct

Option B (Both Statement I and Statement II are correct) is correct because the primary

C{O_2}

acceptor in

{C_4}

plants is indeed phosphoenolpyruvate (PEP) in mesophyll cells, and these cells lack RuBisCO.

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16 Hard

16 of 50

Remembering +4 | -1

{C_3}

cycle the primary

C{O_2}

acceptor is?

View answer and explanation

Correct option: A

RUBP

Option A (RUBP) is correct because RuBP (Ribulose-1,5-bisphosphate) is the primary CO2 acceptor in the C3 cycle (Calvin cycle).

17 Hard

17 of 50

Understanding +4 | -1

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

View answer and explanation

Correct option: D

1 molecule of 3-C compound

Option D (1 molecule of 3-C compound) is correct because the oxygenation of RuBP by RuBisCO in photorespiration results in one molecule of 3-phosphoglycerate (3-C) and one molecule of 2-phosphoglycolate (2-C).

18 Hard

18 of 50

Remembering +4 | -1

Number of the protons required to synthesized one ATP during chemiosmosis?

View answer and explanation

Correct option: B

Option B (4) is the correct answer because approximately 4 protons are required to synthesize one ATP molecule during chemiosmosis in chloroplasts.

19 Hard

19 of 50

Remembering +4 | -1

Which of the following is synthesized in the dark-reaction of photosynthesis?

View answer and explanation

Correct option: D

PGA

Option D (PGA) is correct because PGA (3-phosphoglycerate) is synthesized during the carbon fixation stage of the dark reactions (Calvin cycle).

20 Hard

20 of 50

Remembering +4 | -1

NADP reductase enzyme can be found on:-

View answer and explanation

Correct option: A

Stroma side of thylakoid membrane

Option A (Stroma side of thylakoid membrane) is correct because NADP reductase enzyme is located on the stroma side of the thylakoid membrane.

21 Hard

21 of 50

Remembering +4 | -1

Anoxygenic photosynthesis is characteristic of

View answer and explanation

Correct option: A

Rhodospirillum

Option A (Rhodospirillum) is correct because anoxygenic photosynthesis is a characteristic feature of this genus of bacteria.

22 Hard

22 of 50

Analyzing +4 | -1

How many additional ATP and

\mathrm{NADPH}_2

molecules are required during synthesis of one glucose molecule in sugarcane than rice plant?

View answer and explanation

Correct option: D

12,0

Option D (12,0) is correct because C4 plants require 2 additional ATP per CO2 fixed compared to C3 plants. For one glucose molecule (6 CO2), this amounts to 12 additional ATP. No additional NADPH2 is required.

23 Hard

23 of 50

Remembering +4 | -1

Maximum absorption by chlorophyll-a is seen in (P). The maximum rate of photosynthesis is seen in (Q). The correct words filling (P) and (Q) are

View answer and explanation

Correct option: C

(P): blue light and (Q): red light

Option C ((P): blue light and (Q): red light) is correct because chlorophyll-a has maximum absorption in blue light, and the maximum rate of photosynthesis is seen in red light.

24 Hard

24 of 50

Understanding +4 | -1

Identifying the correct statements regarding chemiosmotic hypothesis

a) Cytochrome

{b_6}/f

acts a proton pump

b)

C{F_0}

forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane

c) Conformational change in the

C{F_1}

particle of the ATP synthase leads to ATP formation

d) Energy is not used to pump protons across a membrane, to create a gradient or a high concentration of protons with in the thylakoid lumen.

e) ATP synthesis occurs due to breakdown of proton concentration gradient established between lumen and stroma.

View answer and explanation

Correct option: D

a, b, c and e

The correct answer is D (a, b, c and e) because these statements accurately describe the chemiosmotic hypothesis related to ATP synthesis in chloroplasts.

25 Hard

25 of 50

Understanding +4 | -1

Tropical plants have a ____ temperature optimum that the plants adapted to temperate climates?

View answer and explanation

Correct option: C

Higher

Option C (Higher) is correct because tropical plants are adapted to warmer climates and thus have a higher temperature optimum for photosynthesis than plants in temperate climates.

26 Hard

26 of 50

Remembering +4 | -1

In blue-green algae photosynthesis takes place in:

View answer and explanation

Correct option: B

Chromatophore

Option B (Chromatophore) is correct because blue-green algae (cyanobacteria) lack chloroplasts, and photosynthesis occurs in chromatophores, which are specialized structures containing photosynthetic pigments.

27 Hard

27 of 50

Understanding +4 | -1

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

View answer and explanation

Correct option: B

{C_4}

Option B (

{C_4}

) is correct because

{C_4}

plants exhibit adaptations that minimize photorespiration, improve water use efficiency, and enhance photosynthesis at high temperatures.

28 Hard

28 of 50

Remembering +4 | -1

Molecular formula of chlorophyll-

b

View answer and explanation

Correct option: A

\mathrm{C}_{55} \mathrm{H}_{70} \mathrm{O}_6 \mathrm{~N}_4 \mathrm{Mg}

Option A (

\mathrm{C}_{55} \mathrm{H}_{70} \mathrm{O}_6 \mathrm{~N}_4 \mathrm{Mg}

) is correct because it represents the accurate molecular formula for chlorophyll-b.

29 Hard

29 of 50

Remembering +4 | -1

Which of the following is a copper-containing protein acting as a mobile electron carrier in thylakoid membrane?

View answer and explanation

Correct option: A

Plastocyanin

Option A (Plastocyanin) is correct because plastocyanin is a copper-containing protein that acts as a mobile electron carrier in the thylakoid membrane.

30 Hard

30 of 50

Analyzing +4 | -1

I. It is the characteristic of

{C_4} -

plants II. It is the characteristic of

{C_3} -

-plants III. It occurs in chloroplast IV. It occurs in day time V. It occurs in night Select the correct options in relation to photorespiration Correct option Incorrect option

View answer and explanation

Correct option: B

II, III, IV      I, V

The correct answer is B (II, III, IV I, V) because photorespiration is characteristic of C3 plants, occurs in chloroplasts and daytime, and not C4 plants or nighttime.

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