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Plant Physiology (GATE)

Description: GATE
Number of Questions: 15
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Tags: GATE Photosynthesis
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Which of the following is an example of CAM plants?

  1. Friendship tree

  2. Mealie plant

  3. Sugarcane

  4. Barley

  5. Brown rice

Show answer
Correct Option: A
Explanation:

This option is correct because friendship tree is an example of CAM plants. CAM is named after the family Crassulaceae. CAM stands for crassulacean acid metabolism because it was first studied in members of the plant family Crassulaceae, to which the friendship tree (Crassula ovata) belongs.

Which of the following photosynthetic pigments are not found in higher plants and green algae?

P. α-Chlorophyll Q. β-Chlorophyll R. Chlorophyll c S. Phycobilin

  1. P and Q

  2. Q and R

  3. Q and S

  4. R and S

  5. Q, R and S

Show answer
Correct Option: D
Explanation:

This option is correct because Chlorophyll c is found only in the photosynthetic members of the chromista as well as the dinoflagellates and Phycobilins are water-soluble pigments, and are therefore, found in the cytoplasm or in the stroma of the chloroplast. They occur only in Cyanobacteria and Rhodophyta.

Which of the following statements regarding 'Photosystem I' is/are incorrect?

A. Photosystem I lies in outer surface of thylakoids. B. Reaction centre of Photosystem I is P680. C. It participates in both cyclic as well as non-cyclic phosphorylation. D. Molecular oxygen is evolved as a result of photolysis of water.

  1. A and B

  2. A and C

  3. A and D

  4. B and C

  5. B and D

Show answer
Correct Option: E
Explanation:

This option is correct because reaction centre of PS I is P700 and no molecular oxygen is evolved in PS I. Molecular oxygen is evolved as a result of photolysis of water in PS II.

Which of the following herbicides act by interfering in light reaction of photosynthesis?

P. 2,4-D Q. DCMU R. N-(phosphonomethyl)glycine S. Atrazine

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. Q and S

Show answer
Correct Option: E
Explanation:

This option is correct because two major classes of herbicides that block photosynthetic electron flow are derivatives of urea and triazine herbicides. 

Which of the following statements is/are not correct regarding photosynthesis?

P. Maximum photosynthesis takes place in green light. Q. Quantum yield of photosynthesis is 0.125. R. Energy conversion efficiency of photosynthesis is 66%. S. 90% of the total photosynthesis in the world is carried out by marine algae.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: B
Explanation:

This option is correct because maximum photosynthesis takes place in red light, next best in blue light and in green light. Energy conversion efficiency of photosynthesis is 33%.

Which of the following statements are incorrect regarding non-cyclic phosphorylation?

P. Oxygenic process Q. Only one light trapping system (PS I) is involved. R. No NADPH is synthesised. S. NADP acts as the last electron acceptor.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: C
Explanation:

This option is correct because two light trapping systems (PS I and PS II) are involved in non-cyclic phosphorylation and NADPH is synthesised during non-cyclic phosphorylation.

Which of the following statements are correct regarding C3 plants?

  1. C3 plants occur only in tropical region climates.
  2. Leaves show Kranz anatomy.
  3. Mesophyll cells are not differentiated.
  4. Bundel sheath is absent.

  1. 1 and 2

  2. 1, 2 and 3

  3. 2, 3 and 4

  4. Only 3

  5. Only 4

Show answer
Correct Option: E
Explanation:

This option is correct because bundle sheath is not found in C3 plants.

Which of the following matchings is incorrect?

  1. Ribulose l,5-bisphosphate → 3-phosphoglycerate: Rubisco

  2. 3-Phospho glycerate → Glycerate 1,3-bisphosphate: Phosphoglycerate kinase

  3. Dihydroxy acetone phosphate → Fructose 1,6-bisphosphate: Aldolase

  4. Xylulose 5-phosphate → Ribulose 5-phosphate: ribose-5-phosphate isomerase

  5. Ribulose 5-phosphate → Ribulose 1,5,- bisphosphate: Phosphoribulokinase

Show answer
Correct Option: D
Explanation:

This option is wrong because conversion of xylulose 5-phosphate to ribulose 5-phosphate is catalysed by ribulose-phosphate epimerase, whereas conversion of ribose 5-phosphate to ribulose 5-phosphate is catalysed by ribose-5-phosphate isomerise.

The correct sequence for flow of electrons from excited P680* (in Photo System II) to P700 (reaction centre of Photo System I) is

  1. P680* → Pheophytin → Plastoquinone → Cytochrome b6-f complex → Plastocyanin → P 700

  2. P680* → Plastoquinone → Pheophytin → Cytochrome b6-f complex → Plastocyanin → P 700

  3. P680* → Pheophytin → Cytochrome b6-f complex → Plastoquinone → Plastocyanin → P 700

  4. P680* → Plastocyanin → Plastoquinone → Cytochrome b6-f complex → Pheophytin → P 700

  5. P680* → Plastoquinone → Pheophytin → Plastocyanin → Cytochrome b6-f complex → P 700

Show answer
Correct Option: A
Explanation:

Correct answer is P680* → Pheophytin → Plastoquinone → Cytochrome b6-f complex → Plastocyanin → P 700.

Match the columns:

 
Column – I Column – II
P. Emerson and Arnold 1. Oxygen comes from water in photosynthesis
Q. Ruben and Kamen 2. Chloroplasts as the site of photosynthesis
R. Arnon 3. Mechanism of phosphorylation in chloroplast
S. Engelmann 4. Existence of light and dark reaction in photosynthesis

  1. P - 2, Q - 1, R - 3, S - 4

  2. P - 2, Q - 3, R - 4, S - 1

  3. P - 3, Q - 1, R - 4, S - 2

  4. P - 3, Q - 4, R - 2, S - 1

  5. P - 4, Q - 2, R - 3, S - 1

Show answer
Correct Option: C
Explanation:

This option is correct because all are correctly matched. In 1932, Emerson and Arnold proved the existence of light and dark reaction in photosynthesis. In 1939, Samuel Ruben and Martin Kamen used radioactive isotopes to determine that the oxygen liberated in photosynthesis came from the water. In 1954, Arnon discovered the mechanism of phosphorylation in chloroplasts. In 1881, Theodore Engelmann identified chloroplasts as the site of photosynthesis.  

Which of the following statements about dark reaction is/are incorrect?

P. Source of energy for dark reaction is ATP synthesised in light reaction. Q. Raw materials of dark reaction are water, ADP and H3PO4. R. Oxygen is a by-product of dark reaction and is released in the atmosphere. S. Dark reaction occurs in stroma of chloroplast.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S

Show answer
Correct Option: D
Explanation:

This option is correct because water, ADP and H3PO4 are raw materials for light reaction. Raw materials of dark reaction are CO2, NADPH2 and ATP. Oxygen is a by-product of light reaction and is released in the atmosphere.

Which of the following is the correct molecular formula of chlorophyll f?

  1. C35H30O5N4Mg

  2. C55H72O5N4Mg

  3. C54H70O6N4Mg

  4. C55H72O6N4Mg

  5. C55H70O6N4Mg

Show answer
Correct Option: E
Explanation:

This option is correct because molecular formula of chlorophyll f is C55H70O6N4Mg.

Raw materials for light reaction are

  1. CO2, NADPH2 and ATP

  2. water, ADP and H3PO4

  3. NADP, H3PO4 and ADP

  4. NADPH2, ATP and O2

  5. hexose sugar

Show answer
Correct Option: B
Explanation:

This option is correct because raw materials for light reaction are water, ADP and H3PO4.

Which of the following statements are not true regarding C4 plants?

P. Carbon dioxide fixation occurs twice. Q. PEP acts as carbon dioxide acceptor in bundle sheath. R. Leaf anatomy is of Kranz type. S. They require 18 ATP for synthesis of one molecule of glucose.

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S

Show answer
Correct Option: D
Explanation:

This option is correct because phosphoenolpyruvate (PEP) acts as carbon dioxide acceptor in mesophyll cells and ribulose-1,5-bisphosphate (RuBP) in bundle sheath functions as carbon dioxide acceptor and C4 plants require 30 ATP molecules for synthesis of one molecule of glucose.

Match the columns:

 
Column – I Column – II
P. Hill and Bendal 1. Z-scheme of light reaction
Q. Peter Mitchell 2. Chemiosmotic hypothesis of ATP synthesis in light reaction
R. Hatch and Slack 3. C3 pathway for CO2 fixation
S. Melvin Calvin 4. C4 pathway for CO2 fixation

  1. P - 1, Q - 2, R - 3, S - 4

  2. P - 2, Q - 1, R - 4, S - 3

  3. P - 3, Q - 2, R - 1, S - 4

  4. P - 4, Q - 3, R - 2, S - 1

  5. P - 1, Q - 2, R - 4, S - 3

Show answer
Correct Option: E
Explanation:

All are correctly matched.

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