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NEET Exam  >  NEET Test  >  Biology Class 11  >  C4 Pathway & Photorespiration - NEET MCQ

C4 Pathway & Photorespiration - Free MCQ Test with solutions for NEET Biology


MCQ Practice Test & Solutions: C4 Pathway & Photorespiration (10 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "C4 Pathway & Photorespiration". These 10 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

Sign up on EduRev for free to attempt this test and track your preparation progress.

C4 Pathway & Photorespiration - Question 1
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When CO2 is added to PEP, the first stable product synthesised is​

Detailed Solution: Question 1

When CO2 is added to PEP, the first stable product synthesised is oxaloacetate.The beginning of this process takes place in the mitochondrial matrix, where pyruvate molecules are found. A pyruvate molecule is carboxylated by a pyruvate carboxylase enzyme, activated by a molecule each of ATP and water. This reaction results in the formation of oxaloacetate. NADH reduces oxaloacetate to malate.

NCERT Topic: CO2 fixation

NCERT Line: "Experiments conducted over a wide range of plants led to the discovery of another group of plants, where the first stable product of CO2 fixation was again an organic acid, but one which had 4 carbon atoms in it. This acid was identified to be oxaloacetic acid or OAA."

C4 Pathway & Photorespiration - Question 2
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Select the incorrectly matched pair with regard to the C4 cycle.​

Detailed Solution: Question 2

PEP carboxylase catalyzes carboxylation of phosphoenolpyruvate (PEP, the primary acceptor of CO2) to form four carbon compound oxaloacetate in mesophyll cells of C4 plants. Initial carboxylation reaction of C4 cycle takes place in mesophyll cell wherein oxaloacetate is converted into the intermediate malate. Malate is transported to bundle-sheath cell and is decarboxylated to produce pyruvate and CO2. Rubisco present in bundle sheath cells then carries out fixation of released carbon dioxide. Maize is a C4 with characteristic kranz anatomy consisting of mesophyll and bundle sheath cells. Thus, the correct answer is option A.

NCERT Topic: C4 plants

NCERT Line: "The primary CO2 acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cells."

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C4 Pathway & Photorespiration - Question 3
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Kranz anatomy is one of the characteristics of the leaves of

Detailed Solution: Question 3

Kranz anatomy occurs in the chloroplast of C4 plants such as sugarcane, maize (Zea mays), sorghum etc. It has two types of photosynthetic cell arranged in a specific manner. These are bundle sheath cells that surround the vascular centres, and mesophyll cells that, in turn, surround the bundle sheath cells. Rubisco is localised only within internalised bundle sheath cells which helps in fixation of carbon dioxide.
So, the correct answer is option B.

NCERT Topic: Kranz anatomy

NCERT Line: "The particularly large cells around the vascular bundles of the C plants are called bundle sheath cells, and the leaves which have such anatomy are said to have ‘Kranz' anatomy."

C4 Pathway & Photorespiration - Question 4
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Which of these is true regarding carbon dioxide fixation?

Detailed Solution: Question 4

  • The first step of the Calvin pathway is the carbon dioxide fixation step.
  • The carbon dioxide acceptor molecule RuBP combines with carbon dioxide to give 2 molecules of 3PGA with RuBisCO as the catalyst.

NCERT Topic: Carboxylation

NCERT Line: "Carboxylation is the fixation of CO2 into a stable organic intermediate. Carboxylation is the most crucial step of the Calvin cycle where CO2 is utilised for the carboxylation of RuBP. This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA."

C4 Pathway & Photorespiration - Question 5
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In photorespiration, the cell organelles involved are

Detailed Solution: Question 5

This process occurs when the concentration of oxygen increase and carbon dioxide decrease and its substrate is glycolate. RubisCO, catalase (CAT) and GOX, and GDC are the main enzymes in chloroplasts, leaf peroxisomes, and mitochondria from mature leaves, respectively, and support the major role of the photorespiratory C2 cycle in leaf metabolism.
So the correct option is 'Mitochondria, peroxisomes and chloroplasts'.

NCERT Topic: Chloroplast, mitochondrion and peroxisome

NCERT Line: "Chloroplast, mitochondrion and peroxisome."

C4 Pathway & Photorespiration - Question 6
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Chloroplast dimorphism is a characteristic feature of​

Detailed Solution: Question 6

The leaves of C4 plants have a characteristic anatomy consisting of concentric bundle sheath and mesophyll cell layers around the vascular bundles. These two distinct cell layers possess chloroplasts which have either structural or size dimorphism.

C4 Pathway & Photorespiration - Question 7
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The correct sequence of cell organelles during photo respiration is​

Detailed Solution: Question 7

Photorespiration is a biochemical process in plants in which, especially under conditions of water stress, oxygen inhibits the Calvin cycle, the carbon fixation portion of photosynthesis. The three organelles participates in photorespiration are chloroplast, mitochondria and peroxisomes. Thus, option A is correct.
Organelles such as vacuoles, Golgi bodies, rough endoplasmic reticulum and dictyosomes does not involve in photorespiration. Thus, other options are wrong.

C4 Pathway & Photorespiration - Question 8
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Which one of the following is wrong in relation to photorespiration?​

Detailed Solution: Question 8

C4 plant does not show photorespiration.

NCERT Topic: Photorespiration

NCERT Line: "In C₄ plants photorespiration does not occur."

C4 Pathway & Photorespiration - Question 9
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Complete the reaction.
RuBP + CO2 →

Detailed Solution: Question 9

  • The given reaction is that of the first step of the Calvin cycle, carbon dioxide fixation.
  • RuBP combines with carbon dioxide to form two molecules of 3PGA. RuBisCO is an enzyme that catalyses the reaction.

NCERT Topic: The Calvin cycle

NCERT Line: "Carboxylation is the fixation of CO2 into a stable organic intermediate. Carboxylation is the most crucial step of the Calvin cycle where CO2 is utilised for the carboxylation of RuBP. This reaction is catalysed by the enzyme RuBP carboxylase which results in the formation of two molecules of 3-PGA."

C4 Pathway & Photorespiration - Question 10
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The Bundle sheath cells are rich in -------- while lacks----.

Detailed Solution: Question 10

The Bundle sheath cells are rich in RuBisCo while lacks PEPCase.

- RuBisCo: Enzyme responsible for carbon fixation in the Calvin cycle.
- PEPCase: Enzyme involved in C4 photosynthesis, found in mesophyll cells.

In C4 plants, Bundle sheath cells possess RuBisCo for the Calvin cycle, while PEPCase is located in mesophyll cells where initial carbon fixation occurs. This spatial separation enhances efficiency by concentrating CO2 for RuBisCo in Bundle sheath cells.

NCERT Topic: Bundle sheath cells

NCERT Line: "The bundle sheath cells are rich in an enzyme Ribulose bisphosphate carboxylase-oxygenase (RuBisCO), but lack PEPcase."

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About this NEET Practice Test

This test contains 10 MCQs on C4 Pathway & Photorespiration with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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If you found this C4 Pathway & Photorespiration MCQ Test helpful, you can further enhance your NEET preparation with in-depth courses on EduRev, for all the subjects and topics available in Biology Class 11 course. The course offers:
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