NEET Exam  >  NEET Tests  >  C4 Pathway & Photorespiration - NEET MCQ

C4 Pathway & Photorespiration - NEET MCQ


Test Description

10 Questions MCQ Test - C4 Pathway & Photorespiration

C4 Pathway & Photorespiration for NEET 2024 is part of NEET preparation. The C4 Pathway & Photorespiration questions and answers have been prepared according to the NEET exam syllabus.The C4 Pathway & Photorespiration MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for C4 Pathway & Photorespiration below.
Solutions of C4 Pathway & Photorespiration questions in English are available as part of our course for NEET & C4 Pathway & Photorespiration solutions in Hindi for NEET course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt C4 Pathway & Photorespiration | 10 questions in 10 minutes | Mock test for NEET preparation | Free important questions MCQ to study for NEET Exam | Download free PDF with solutions
C4 Pathway & Photorespiration - Question 1

When CO2 is added to PEP, the first stable product synthesised is​

Detailed Solution for C4 Pathway & Photorespiration - 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

Select the incorrectly matched pair with regard to the C4 cycle.​

Detailed Solution for C4 Pathway & Photorespiration - 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."

1 Crore+ students have signed up on EduRev. Have you? Download the App
C4 Pathway & Photorespiration - Question 3

Kranz anatomy is one of the characteristics of the leaves of

Detailed Solution for C4 Pathway & Photorespiration - 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

Which of these is true regarding carbon dioxide fixation?

Detailed Solution for C4 Pathway & Photorespiration - 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

In photorespiration, the cell organelles involved are

Detailed Solution for C4 Pathway & Photorespiration - 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

Chloroplast dimorphism is a characteristic feature of​

Detailed Solution for C4 Pathway & Photorespiration - 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

The correct sequence of cell organelles during photo respiration is​

Detailed Solution for C4 Pathway & Photorespiration - 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

Which one of the following is wrong in relation to photorespiration?​

Detailed Solution for C4 Pathway & Photorespiration - 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

Complete the reaction.
RuBP + CO2 →

Detailed Solution for C4 Pathway & Photorespiration - 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

The Bundle sheath cells are rich in -------- while lacks----.

Detailed Solution for C4 Pathway & Photorespiration - 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."

Information about C4 Pathway & Photorespiration Page
In this test you can find the Exam questions for C4 Pathway & Photorespiration solved & explained in the simplest way possible. Besides giving Questions and answers for C4 Pathway & Photorespiration, EduRev gives you an ample number of Online tests for practice

Top Courses for NEET

Download as PDF

Top Courses for NEET