Photosynthesis in Higher Plants

The enzyme required for carboxylation in the Calvin cycle is :

1. PEP carboxylase
2. RuBP carboxylase – oxygenase
3. Carboxypeptidase
4. Hexokinase

Find the incorrect statement(s) about photosynthesis from the following : Choose the answer from the options given below :

1. B and C only
2. B and E only
3. B only
4. A and D only

How many ATP and NADPH molecules are required to make one molecule of glucose through the Calvin pathway ?

1. 12 ATP and 18 NADPH
2. 18 ATP and 12 NADPH
3. 6 ATP and 12 NADPH
4. 24 ATP and 18 NADPH

How many turns of Calvin cycle are required for the formation of three molecules of glucose?

1. 18
2. 6
3. 3
4. 1

Photorespiration reaction catalyzed by RuBisCo is shown below: RuBP + O2 3-Phosphoglycerate + X Identify “X” from the given options:

1. Malate
2. Phosphoenolpyruvate
3. 2-Phosphoglycolate
4. Oxaloacetate

Which pigment has absorption peak at 700 nm in the photosynthetic reaction centre PS I (P700)?

1. Carotenoids
2. Chlorophyll b
3. Chlorophyll a
4. Xanthophylls

Which of the following statements regarding photorespiration are correct?

1. (A) and (B) only
2. (A) and (D) only
3. (C) and (D) only
4. (B) and (D) only

Select the correct sequence of experiments that led to a gradual understanding of photosynthesis in green plants.

1. Production of glucose role of air release of oxygen absorption spectra of chlorophyll a and b
2. Absorption spectra of chlorophyll a and b production of glucose release of oxygen role of air
3. Role of air release of oxygen production of glucose absorption spectra of chlorophyll a and b
4. Release of oxygen production of glucose absorption spectra of chlorophyll a and b role of air

Which of the following statements about RuBisCO is true?

1. It is an enzyme involved in the photolysis of water
2. It catalyzes the carboxylation of RuBP
3. It is active only in the dark
4. It has higher affinity for oxygen than carbon dioxide

How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle?

1. 2 molecules of ATP and 3 molecules of NADPH
2. 2 molecules of ATP and 2 molecules of NADPH
3. 3 molecules of ATP and 3 molecules of NADPH
4. 3 molecules of ATP and 2 molecules of NADPH

Which of the following are required for the dark reaction of photosynthesis? Choose the correct answer from the options given below:

1. A, B and C only
2. B, C and D only
3. C, D and E only
4. D and E only

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Which of the following are required for the light reaction of Photosynthesis? Choose the correct answer from the options given below:

1. A, C, D and E only
2. C, D and E only
3. A and B only
4. A, C and E only

Which one of the following products diffuses out of the chloroplast during photosynthesis?

1. ADP
2. NADPH
3. O2
4. ATP

Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option. [figure]

1. A-Carboxylation, B-Regeneration, C-Reduction
2. A-Reduction, B-Decarboxylation, C-Regeneration
3. A-Carboxylation, B-Reduction, C-Regeneration
4. A-Reduction, B-Carboxylation, C-Regeneration

How many ATP and NADPH are required for the synthesis of one molecule of Glucose during Calvin cycle?

1. 18 ATP and 12 NADPH
2. 12 ATP and 16 NADPH
3. 18 ATP and 16 NADPH
4. 12 ATP and 12 NADPH

The reaction centre in PS II has an absorption maximum at

1. 700 nm
2. 660 nm
3. 780 nm
4. 680 nm

Which of the following combinations is required for chemiosmosis?

1. Membrane, proton pump, proton gradient, NADP synthase
2. Proton pump, electron gradient, ATP synthase
3. Proton pump, electron gradient, NADP synthase
4. Membrane, proton pump, proton gradient, ATP synthase

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

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

1. Breakdown of proton gradient
2. Breakdown of electron gradient
3. Movement of protons across the membrane to the stroma
4. Reduction of NADP to NADPH2 on the stroma side of the membrane

What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?

1. To provide the site for photorespiratory pathway
2. To increase the number of chloroplast for the operation of Calvin cycle
3. To enable the plant to tolerate high temperature
4. To protect the vascular tissue from high light intensity

When one CO2 molecule is fixed as one molecule of triose phosphate, which of the following photochemically made, high energy chemical intermediates are used in the reduction phase?

1. 2 ATP + 2 NADPH
2. 1 ATP + 1 NADPH
3. 1 ATP + 2 NADPH
4. 2 ATP + 1 NADPH

Identify the correct statements regarding chemiosmotic hypothesis: Choose the correct answer from the options given below:

1. B, C and E only
2. A, B and E only
3. A, B and D only
4. B, C and D only

The first stable product of CO2 fixation in Sorghum is

1. Phosphoglyceric acid
2. Pyruvic acid
3. Oxaloacetic acid
4. Succinic acid

Which of the following statements is incorrect?

1. Cyclic photophosphorylation involves both PS I and PS II
2. Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation.
3. Stroma lamellae have PS I only and lack NADP reductase
4. Grana lamellae have both PS I and PS II

In light reaction, plastoquinone facilitates the transfer of electrons from

1. PS-I to ATP synthase
2. Cytb6f complex to PS-I
3. PS-I to NADP+
4. PS-II to Cytb6f complex

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

1. 1 molecule of 3-C compound and 1 molecule of 2-C compound
2. 1 molecule of 3-C compound
3. 1 molecule of 6-C compound
4. 2 molecules of 3-C compound

Oxygen is not produced during photosynthesis by

1. Cycas
2. Green sulphur bacteria
3. Chara
4. Nostoc

Which of the following is not a product of light reaction of photosynthesis?

1. Oxygen
2. NADH
3. ATP
4. NADPH

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate.
2. C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum.
3. Tomato is a greenhouse crop which can be grown in CO2-enriched atmosphere for higher yield.
4. Light saturation for CO2 fixation occurs at 10% of full sunlight.