GATE XL Plant physiology and biochemistry PYQs & Answers — Page 4

Questions 31–40 of 41. Imported answers require independent review unless marked reviewed.

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

Your answerChoose one option.

phloem

xylem

border pits

tracheids

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

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

Your answerChoose one option.

P and S

Q and S

P and Q

R and S

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the options in Group I with that of Group II with respect to steps in signal transduction mechanism in plants

Group I P. Phospholipase C Q. Inositol triphosphate R. Diacylglycerol S. Phosphatidic acid

Group II

stimulates release of calcium from intracellular stores

regulates ion channels/activates various enzymes

hydrolyzes phosphatidylinositol bisphosphate (PIP2)

phosphorylated to phosphatidic acid

Your answerChoose one option.

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

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

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

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Select the CORRECT combination of the following statements.

P. The cyclic electron transport chain involving PSI results in net production of both ATP and NADP Q. The cyclic electron transport chain involving PSI results in net production of ATP R. Rubisco enzyme usually converts RuBP and CO₂ into 2-phosphoglycolate and 3-phosphoglycerate S. Rubisco enzyme usually converts RuBP and O₂ into 2-phosphoglycolate and 3-phosphoglycerate

Your answerChoose one option.

P, Q

R, S

Q, S

P, R

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Select the CORRECT combination by matching Group-I with Group-II.

Group-I P. Photorespiration Q. Respiration R. Amino acid degradation S. Fatty acid synthesis

Group-II

Glutamate → 2-Oxoglutarate

Acetyl-CoA → Malonyl-CoA

2-Oxoglutarate → Succinyl-CoA

Glycine → Serine

Your answerChoose one option.

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

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

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

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Identify the CORRECT combination of statements with respect to chemical defense in plants.

P. Pisatin, a phytoalexin produced by Ricinus communis is a constitutive defense compound Q. Phaseolus vulgaris produces Phaseolus agglutin I, which is toxic to the cowpea weevil R. A single step non-enzymatic hydrolysis of cyanogenic glycoside releases the toxic hydrocyanic acid (HCN) to protect plant against herbivores and pathogens S. Avenacin, a triterpenoid saponin from oat prevents infection by Gaeumannomyces graminis, a major pathogen of cereal roots

Your answerChoose one option.

P, Q

Q, S

R, S

P, S

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following plant hormones is a carotenoid-cleavage product?

Your answerChoose one option.

Phytosufokine

Brassinosteroid

Methyl jasmonate

Strigolactone

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Identify the INCORRECT statement with relation to plant secondary metabolites.

Your answerChoose one option.

Atropine is a member of indole alkaloids

Limonene is a cyclic terpene found in citrus plants

Green tea is rich in polyphenols

Cyanidin contributes to the red color in rose petals

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Choose the CORRECT set of matches between group I and group II in relation to nitrogen fixation and assimilation

GROUP I P. Nitrobacter Q. Nitrite reductase R. Nitrogenase S. Nitrate reductase

GROUP II

NO₃⁻ → NO₂⁻

N₂ → 2NH₃

NO₂⁻ → NH₄⁺

NO₂⁻ → NO₃⁻

Your answerChoose one option.

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

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

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

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Two plant cells M and N are lying side by side making direct contact. “M” has osmotic potential (Ψs) of -10 bar and pressure potential (Ψp) of 4 bar. On the other hand, “N” has osmotic potential (Ψs) of -12 bar and pressure potential (Ψp) of 5 bar.

Based on these data, what would be the direction of movement of water between M and N?

Your answerChoose one option.

M to N

N to M

There will be no movement

In both directions

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XL Plant physiology and biochemistry PYQs

Question 9

Question 11

Question 16

Question 13

Question 16

Question 18

Question 40

Question 45

Question 46

Question 47