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Test: C4 pathway & Photorespiration (June 21) - NEET MCQ


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10 Questions MCQ Test - Test: C4 pathway & Photorespiration (June 21)

Test: C4 pathway & Photorespiration (June 21) for NEET 2024 is part of NEET preparation. The Test: C4 pathway & Photorespiration (June 21) questions and answers have been prepared according to the NEET exam syllabus.The Test: C4 pathway & Photorespiration (June 21) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: C4 pathway & Photorespiration (June 21) below.
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Test: C4 pathway & Photorespiration (June 21) - Question 1

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

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - 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.

Test: C4 pathway & Photorespiration (June 21) - Question 2

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

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - 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.

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Test: C4 pathway & Photorespiration (June 21) - Question 3

Kranz anatomy is one of the characteristics of the leaves of

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - 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.

Test: C4 pathway & Photorespiration (June 21) - Question 4

Stomata of CAM plants

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - Question 4

Stomata usually open when leaves are transferred from darkness to light. However, reverse-phase stomatal opening in succulent plants has been known. CAM plants such as cacti and Opuntia ficus–indica achieve their high water use efficiency by opening their stomata during the cool, desert nights and closing them during the hot, dry days. Signal transduction pathway for stomatal opening by blue light photoreceptors including phototropins and the carotenoid pigment zeaxanthin has been suggested. Blue light regulated signal transduction pathway on stomatal opening could not be applied to CAM plants, but the most possible theory for a nocturnal response of stomata in CAM plants is photoperiodic circadian rhythm.

Test: C4 pathway & Photorespiration (June 21) - Question 5

In photorespiration, the cell organelles involved are

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - 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'.

Test: C4 pathway & Photorespiration (June 21) - Question 6

Which of the following statements regarding the Cpathway is false?​

Test: C4 pathway & Photorespiration (June 21) - Question 7

Chloroplast dimorphism is a characteristic feature of​

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - Question 7

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.

Test: C4 pathway & Photorespiration (June 21) - Question 8

The correct sequence of cell organelles during photo respiration is​

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - Question 8

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.

Test: C4 pathway & Photorespiration (June 21) - Question 9

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

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - Question 9
C4 plant does not show photorespiration.
Test: C4 pathway & Photorespiration (June 21) - Question 10

The type of CO2 fixation seen in many succulent plant species is​

Detailed Solution for Test: C4 pathway & Photorespiration (June 21) - Question 10

One key biochemical innovation of agaves and cacti is the Crassulacean Acid Metabolism (CAM), a water-efficient type of photosynthesis, which allows plants to fix carbon dioxide during the night, in this way preventing evaporation during the day.

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