GATE XL 2023 Paper 1 — page 20

Questions 58–60 of 122. Imported answers require review unless explicitly marked reviewed.

Central vascular cylinder or stele consists of the primary vascular system (xylem and phloem) and the associate fundamental tissue. Match the schematics of stele in Group I (xylem shown in green, and phloem shown as ▦) with their respective types in Group II.

Group I: (P), (Q), (R), (S), each represented by a schematic.

Diagram for Life Sciences question 58 (figure 2)

Diagram for Life Sciences question 58 (figure 3)

Diagram for Life Sciences question 58 (figure 4)

Group II (1) Protostele (2) Eustele (3) Atactostele (4) Ectophloic siphonostele (5) Amphiphloic siphonostele

Your answerChoose one option.

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

P-5; Q-1; R-4; S-2

P-5; Q-3; R-1; S-2

P-3; Q-4; R-2; S-5

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Consider the following four experimental observations (i, ii, iii, iv) on the effect of the FT gene on flowering transition in the shoot apical meristem (SAM) of Arabidopsis thaliana.

i) The FT promoter is active in leaves alone.

ii) The ft null mutation causes delayed flowering transition of the SAM.

iii) Expressing a recombinant FT protein fused to nuclear localization signal sequence under the endogenous promoter does not rescue the delayed-flowering phenotype of the ft null mutant.

iv) Downregulation of FT transcript in the SAM by RNA interference in the wild-type background does not alter flowering transition.

Which one of the following conclusions best explains the above observations?

Your answerChoose one option.

FT protein resident in leaves causes flowering transition of the SAM.

FT transcript moves from leaves to the meristem and promotes flowering.

FT protein moves from leaves to the SAM and promotes flowering.

Both FT transcript and FT protein are required in the SAM to promote flowering.

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Which one of the options given correctly matches the alkaloids in Group I with their source plants in Group II?

Group I P. Cocaine Q. Caffeine R. Morphine S. Atropine

Group II

Coca

Nightshade

Coca

Poppy

Your answerChoose one option.

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

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

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

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

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2023 · Paper 1

Question 58

Question 59

Question 60