NEET Biology Photosynthesis in Higher Plants MCQs Set 10

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Multiple Choice Questions

Question 1: Which group of plants are not benefitted by CO2 fertilisation effect?
(a) Plants requiring 3 ATP per CO2 fixation
(b) Plants with Kranz anatomy
(c) Plants having high rate of photorespiration
(d) Plants having single carboxylation
Show Answer & Explanation

Answer: (b) Plants with Kranz anatomy

Explanation:
1. C4 plants have low CO2 compensation point and presence of organic acid in bundle sheath cells.

Question 2: Identify the reaction for which the C4 plants require some extra ATP molecules in comparison to C3 plants
(a) Conversion of PEP to OAA
(b) Conversion of Pyruvate to PEP
(c) Conversion of Malate to Oxaloacetate
(d) Conversion of PEP to Malate
Show Answer & Explanation

Answer: (b) Conversion of Pyruvate to PEP

Explanation:
1. During conversion of pyruvate to PEP.

Question 3: Photorespiration occurs
(a) During day time
(b) In C3 plants
(c) In co-operation with chloroplasts, peroxisomes and mitochondria
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. Photorespiration occurs during presence of light in C3 plants.

Question 4: During photorespiration, phosphorylation as well as oxidation both occurs in
(a) Centrosome
(b) Peroxisome
(c) Mitochondria
(d) Chloroplast
Show Answer & Explanation

Answer: (d) Chloroplast

Explanation:
1. Phosphorylation and oxidation occur in the chloroplast during photorespiration.

Question 5: Which of the following is not a product of light reaction of photosynthesis?
(a) ATP
(b) NADH
(c) Oxygen
(d) NADPH
Show Answer & Explanation

Answer: (b) NADH

Explanation:
1. ATP, NADPH and oxygen are products of light reaction, while NADH is a product of respiration process.

Question 6: Phosphonol pyruvate (PEP) is the primary CO2 acceptor in
(a) C3 plants
(b) C4 plants
(c) C2 plants
(d) C3 and C4 plants
Show Answer & Explanation

Answer: (b) C4 plants

Explanation:
1. PEP is 3C compound which serves as primary CO2 acceptor in the mesophyll cell cytoplasm of C4 plants like maize, sugarcane, Sorghum etc.

Question 7: With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
(a) Light saturation for CO2 fixation occurs at 10% of full sunlight
(b) Increasing atmospheric CO2 concentration upto 0.05% can enhance CO2 fixation rate
(c) C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum
(d) Tomato is a greenhouse crop which can be grown in CO2 - enriched atmosphere for higher yield
Show Answer & Explanation

Answer: (c) C3 plants responds to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

Explanation:
1. In C3 plants photosynthesis is decreased at higher temperature due to increased photorespiration.
2. C4 plants have higher temperature optimum because of the presence of pyruvate phosphate dikinase enzyme, which is sensitive to low temperature.

Question 8: The process which makes major difference between C3 and C4 plants is
(a) Glycolysis
(b) Calvin cycle
(c) Photorespiration
(d) Respiration
Show Answer & Explanation

Answer: (c) Photorespiration

Explanation:
1. Photorespiration is present in C3 plants but absent in C4 plants.

Question 9: 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 utilisation. In which of the following physiological groups would you assign this plant?
(a) Nitrogen fixer
(b) C3
(c) C4
(d) CAM
Show Answer & Explanation

Answer: (c) C4

Explanation:
1. C4 plants are special, they tolerate higher temperatures, they lack photorespiration and have greater productivity of biomass.

Question 10: Emerson's enhancement effect and Red drop have been instrumental in the discovery of
(a) Oxidative phosphorylation
(b) Photophosphorylation and non-cyclic electron transport
(c) Two photosystems operating simultaneously
(d) Photophosphorylation and cyclic electron transport
Show Answer & Explanation

Answer: (c) Two photosystems operating simultaneously

Explanation:
1. Emerson performed photosynthetic experiment on chlorella.
2. He provided monochromatic light of more than 680 nm and observed decrease in rate of photosynthesis known as red drop.
3. Later he provided synchronised light of 680 nm and 700 nm and observed increase in rate of photosynthesis, known as enhancement effect.
4. This experiment led to discovery of two photosystems. - PS II and PS I.

Question 11: In a chloroplast the highest number of protons are found in
(a) Antennae complex
(b) Stroma
(c) Lumen of thylakoids
(d) Inter membrane space
Show Answer & Explanation

Answer: (c) Lumen of thylakoids

Explanation:
1. Proton concentration is higher in the lumen of thylakoid due to photolysis of water, H+ pumping and NADP reductase activity in stroma.

Question 12: The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?
(a) Magnesium and Chlorine
(b) Manganese and Chlorine
(c) Manganese and Potassium
(d) Magnesium and Molybdenum
Show Answer & Explanation

Answer: (b) Manganese and Chlorine

Explanation:
1. This option, Manganese and Chlorine, is the one that agrees with the standard NCERT facts for this topic.

Question 13: The correct sequence of cell organelles during photorespiration is
(a) Chloroplast, – mitochondria, – peroxisome
(b) Chloroplast, – vacuole, – peroxisome
(c) Chloroplast, – Golgibodies, – mitochondria
(d) Chloroplast, – Rough endoplasmic reticulum, – Dictyosomes
Show Answer & Explanation

Answer: (a) Chloroplast, – mitochondria, – peroxisome

Explanation:
1. Photorespiration completed in three cell organells i.e., chloroplast, peroxysome and mitochondria.

Question 14: PGA as the first CO2 fixation product was discovered in photosynthesis of
(a) Alga
(b) Bryophyte
(c) Gymnosperm
(d) Angiosperm
Show Answer & Explanation

Answer: (a) Alga

Explanation:
1. Melvin calvin used radioactive 14C in algal photosynthesis studies.

Question 15: Read the following four statements, a, b, c and d and select the right option having both correct statements. Statements:<br />a. Z scheme of light reaction takes place in presence of PSI only.<br />b. Only PS I is functional in cyclic photophosphorylation.<br />c. Cyclic photophosphorylation results into synthesis of ATP and NADPH2<br />d. Stroma lamellae lack PS II as well as NADP. Options :
(a) B and D
(b) A and B
(c) B and C
(d) C and D
Show Answer & Explanation

Answer: (a) B and D

Explanation:
1. (A) is wrong because Z schemes requires PS II also (C) is wrong as NADP reductase is not there in cyclic phosphorylation.

Question 16: Kranz anatomy is one of the characteristics of the leaves of
(a) Potato
(b) Wheat
(c) Sugarcane
(d) Mustard
Show Answer & Explanation

Answer: (c) Sugarcane

Explanation:
1. C4 plants, bundle sheath cells  Kranz anatomy.

Question 17: Oxygenic photosynthesis occurs in:
(a) Oscillatoria
(b) Rhodospirillum
(c) Chlorobium
(d) Chromatium
Show Answer & Explanation

Answer: (a) Oscillatoria

Explanation:
1. Oscillatoria  Example of oxygenic photosynthesis, others are anoxygenic.

Question 18: Stroma in the chloroplasts of higher plant contains:
(a) Light-dependent reaction enzymes
(b) Ribosomes
(c) Chlorophyll
(d) Light-independent reaction enzymes
Show Answer & Explanation

Answer: (b) Ribosomes

Explanation:
1. This option, Ribosomes, is the one that agrees with the standard NCERT facts for this topic.

Question 19: The C4 plants are photosynthetically more efficient than C3 plants because
(a) They have more chloroplasts
(b) The CO2 compensation point is more
(c) CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
(d) The CO2 efflux is not prevented
Show Answer & Explanation

Answer: (a) They have more chloroplasts

Explanation:
1. Having large number of chloroplast and absence of photorespiration.

Question 20: In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in
(a) Guard cells
(b) Epidermal cells
(c) Mesophyll cells
(d) Bundle sheath
Show Answer & Explanation

Answer: (c) Mesophyll cells

Explanation:
1. PEP  OAA  Malic acid in mesophyll cells.

Question 21: Electrons from excited chlorophyll molecule of photosystem II are accepted first by
(a) Ferredoxin
(b) Cytochrome - b
(c) Cytochrome - f
(d) Quinone
Show Answer & Explanation

Answer: (d) Quinone

Explanation:
1. PS II  Quinone.

Question 22: Chlorophyll-a molecule at its carbon atom 3 of the pyrrole ring II has one of the following
(a) Carboxylic group
(b) Magnesium
(c) Aldehyde group
(d) Methyl group
Show Answer & Explanation

Answer: (d) Methyl group

Explanation:
1. In the pyrrole ring II at 3 position there is methyl group.

Question 23: Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
(a) Blue and green
(b) Green and red
(c) Red and violet
(d) Violet and blue
Show Answer & Explanation

Answer: (d) Violet and blue

Explanation:
1. Carotenoids absorbed middle part of visible spectrum mainly violet and blue light.

Question 24: The first step for initiation of photosynthesis will be
(a) Photolysis of water
(b) Excitement of chlorophyll molecules due to absorption of light
(c) ATP formation
(d) Glucose formation
Show Answer & Explanation

Answer: (b) Excitement of chlorophyll molecules due to absorption of light

Explanation:
1. During light reaction first of all excitation of chlorophyll molecules occurs due to absorption of light.

Question 25: Which pigment system is inactivated in red drop?
(a) PS-I and PS-II
(b) PS-I
(c) PS-II
(d) None of these
Show Answer & Explanation

Answer: (c) PS-II

Explanation:
1. PS-II, because its reaction centre is P680.

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