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Photosynthesis: Pathways, Mechanisms and Historical Discoveries

Comprehensive quiz covering photosynthetic pathways (C3, C4, CAM), photosystems, light and dark reactions, electron transport, and key historical discoveries in plant physiology

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is an example of CAM plants?

  1. Friendship tree
  2. Mealie plant
  3. Sugarcane
  4. Barley
  5. Brown rice
Question 2 Multiple Choice (Single Answer)

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
Question 3 Multiple Choice (Single Answer)

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
Question 4 Multiple Choice (Single Answer)

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
Question 5 Multiple Choice (Single Answer)

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
Question 6 Multiple Choice (Single Answer)

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
Question 7 Multiple Choice (Single Answer)

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
Question 8 Multiple Choice (Single Answer)

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
Question 9 Multiple Choice (Single Answer)

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
Question 10 Multiple Choice (Single Answer)

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
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

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

  1. C35H30O5N4Mg
  2. C55H72O5N4Mg
  3. C54H70O6N4Mg
  4. C55H72O6N4Mg
  5. C55H70O6N4Mg
Question 13 Multiple Choice (Single Answer)

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
Question 14 Multiple Choice (Single Answer)

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
Question 15 Multiple Choice (Single Answer)

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
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