GATE XL topic:biological-sciences PYQs & Answers — Page 92

Questions 911–920 of 1235. Imported answers require independent review unless marked reviewed.

Which one of the following statements is INCORRECT?

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Nitrogen fixation is aerobic process

Dinitrogenase catalyzes reduction of nitrogen to ammonia

Root nodules are found in Glycine max

Nitrogen fixation is anaerobic process

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Which one of the following statements is INCORRECT with respect to cyclic photophosphorylation?

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ATP is generated without concomitant formation of NADPH

Electron flows from Photosystem I to cytochrome

complex

Photosystem II does not participate in cyclic photophosphorylation

Cyclic photophosphorylation occurs when NADP⁺/NADPH ratio is high

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The plant cells are considered totipotent. The phenomenon of a mature cell reverting to the meristematic state and forming undifferentiated callus tissue is called

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redifferentiation

dedifferentiation

organogenesis

recalcitrancy

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Glyphosate is a broad spectrum herbicide. Upon application to leaves, it is translated to meristematic areas and underground rhizomes by

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phloem

xylem

border pits

tracheids

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If a species has 2n = 16 chromosomes, the number of chromosomes per cell in a double monosomic individual would be

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Rubisco catalyses conversion of ribulose 1,5-bisphosphate to P. two molecules of stable 3-phosphoglycerate Q. one molecule of 3-phosphoglycerate and one molecule of phosphoglycolate R. one molecule of ribulose 5-phosphate S. one molecule of ribose 5-phosphate Choose only the correct combination

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P and S

Q and S

P and Q

R and S

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Select correct combination of molecules given in Group I with their functions in Group II

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P-3, Q-4, R-1, S-2

P-3, Q-1, R-2, S-4

P-4, Q-3, R-1, S-2

P-1, Q-2, R-4, S-3

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Match the plant species and their corresponding families with the economically important products:

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P-2-iv, Q-3-ii, R-4-iii, S-1-i

P-3-iv, Q-2-i, R-1-ii, S-4-iii

P-1-ii, Q-4-iii, R-2-i, S-3-ii

P-2-iv, Q-4-iii, R-1-ii, S-3-i

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Cybirds may arise through the

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fusion of a normal protoplast with another nucleated protoplast of different origin

fusion between a normal protoplast and a protoplast containing viable nucleus

elimination of one of the nuclei from heterokaryon formed from two protoplasts of different origin

fusion of a normal cell with another nucleated cell

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Match the disease with causative organism and affected crop

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P-3-i, Q-1-iv, R-2-iii, S-4-ii

P-3-ii, Q-1-iv, R-4-i, S-2-iii

P-4-ii, Q-1-i, R-3-iv, S-2-iii

P-2-iii, Q-3-ii, R-1-iv, S-4-i

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GATE XL topic:biological-sciences PYQs

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15