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Photosynthesis in Plants

Comprehensive coverage of photosynthesis including CAM and C3/C4 pathways, photosystems I and II, photosynthetic pigments, light and dark reactions, Calvin cycle, non-cyclic and cyclic phosphorylation, chlorophyll properties, and related metabolic processes.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is/are an example of crassulacean acid metabolism plant?

  1. Swan potato
  2. Sorghum
  3. Millets
  4. Soybean
  5. Spinach
Question 2 Multiple Choice (Single Answer)

Which of the following statements are correct about C4 plants?

A. CO2 fixation occurs twice.
B. PEP acts as CO2 acceptor in bundle sheath.
C. Leaf anatomy is of Kranz type.
D. They require 18 ATP for synthesis of one molecule of glucose.

  1. A and B
  2. A and C
  3. B and C
  4. B and D
  5. C and D
Question 3 Multiple Choice (Single Answer)

Which of the following statements are incorrect about photo system I?

A. PS I lies in outer surface of thylakoids.
B. Reaction centre of PS 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 photosynthetic pigments are found in higher plants and green algae?

  1. Chlorophyll a
  2. Chlorophyll b
  3. Chlorophyll c
  4. Phycobilins
  1. 1 and 2
  2. 2 and 3
  3. 2 and 4
  4. 3 and 4
  5. 1 and 3
Question 5 Multiple Choice (Single Answer)

Which of the following statements are incorrect about photosynthesis?

  1. Best photosynthesis takes place in green light.
  2. Quantum yield of photosynthesis is 0.125.
  3. Energy conversion efficiency of photosynthesis is 66%.
  4. 90% of the total photosynthesis in the world is carried out by marine algae.
  1. 1 and 2
  2. 1 and 3
  3. 1 and 4
  4. 2 and 3
  5. 3 and 4
Question 6 Multiple Choice (Single Answer)

Which of the following statements are correct about non-cyclic phosphorylation?

  1. It is an oxygenic process.
  2. Only one light trapping system (PS I) is involved.
  3. No NADPH is synthesised.
  4. NADP acts as last electron acceptor.
  1. 1 and 2
  2. 1 and 3
  3. 2 and 3
  4. 1 and 4
  5. 3 and 4
Question 7 Multiple Choice (Single Answer)

Choose the incorrect reaction.

  1. Ribulose-1,5-bisphosphate → 3-phosphoglycerate: Rubisco
  2. 3-Phosphoglycerate → 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 ribose 5-phosphate isomerise
Question 8 Multiple Choice (Single Answer)

Which of the following statements is/are not correct about 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 9 Multiple Choice (Single Answer)

Match the following:

 
Scientists Their contribution
P. Emerson and Arnold 1. O2 comes from H2O 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 10 Multiple Choice (Single Answer)

Which of the following herbicides do not interfere in light reaction of photosynthesis?

P. 2,4-D
Q. Diuron
R. Glyphosate
S. Atrazine

  1. P and Q
  2. P and R
  3. P and S
  4. Q and R
  5. Q and S
Question 11 Multiple Choice (Single Answer)

The raw materials for dark 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 12 Multiple Choice (Single Answer)

Match the following:

 
Column – I (Scientists) Column – II (Their contribution)
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
Question 13 Multiple Choice (Single Answer)

Which of the following statements are correct about dark reaction?

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 14 Multiple Choice (Single Answer)

Directions: In the following question, there are two statements, Assertion (A) and Reason (R). Consider both the statements independently and mark your answer.

Assertion: The inhibition of glycolysis by oxygen is referred to as Pasteur effect.
Reason: This is due to inhibition of the enzyme phosphofructokinase by ATP and citrate (formed in the presence of O2).

  1. A and R both are correct and R is the correct explanation of A.
  2. A and R both are correct and R is not the correct explanation of A.
  3. A is correct and R is incorrect.
  4. A is incorrect and R is correct.
  5. A and R both are incorrect.
Question 15 Multiple Choice (Single Answer)

Which of the following statements is/are not correct about chlorophyll?

  1. The metal constituent of chlorophyll is Fe.
  2. Chlorophyll is found associated with thylakoid membranes.
  3. Long-chain alcohol esterified to plant chlorophyll molecules is farnesol.
  1. Only 1
  2. Only 2
  3. Only 3
  4. 1 and 2
  5. 1 and 3
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