GATE XL Plant development; cell and tissue morphogenesis PYQs & Answers — Page 3

Questions 21–29 of 29. Imported answers require independent review unless marked reviewed.

The diagram describes the ABC model of flower patterning in Arabidopsis where the A, B and C functions are operational in the whorls (1+2), (2+3) and (3+4), respectively, in the wild-type flower. Removal of A or C function results in the floral organ arrangements as (carpel; stamen; stamen; carpel) or (sepal; petal; petal; sepal), respectively. Based on these observations, which ONE of the following molecular pathways is CORRECT for floral organ pattern generation? Arrow indicates activation and bar indicates inhibition.

Your answerChoose one option.

Diagram for Life Sciences question 13 (figure 2)

Diagram for Life Sciences question 13 (figure 3)

Diagram for Life Sciences question 13 (figure 4)

Diagram for Life Sciences question 13 (figure 5)

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The observations of an experiment on seed germination in various genotypes under different light conditions are given, where √ and X indicate germination and the lack of it, respectively.

Genotype	Blue	Red	Far-red	White	Dark
Wild-type	√	√	√	√	X
cry1 mutant	X	√	√	√	X
phyA mutant	√	√	X	√	X
phyB mutant	√	X	√	√	X
vp1 mutant	√	√	√	√	√

Based on these observations, which of the following option(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

All the three light qualities – blue, red and far-red – are required for seed germination.

Any one of the three light qualities – blue, red and far-red – is sufficient to induce seed germination.

The CRY1, phyA and phyB proteins are required for blue, red and far-red light perception, respectively.

The VP1 protein is unlikely to be involved in light perception.

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In a typical angiosperm under natural condition, primary meristems are usually established during

Your answerChoose one option.

Gametogenesis

Embryogenesis

Vegetative phase development

Secondary growth

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

Your answerChoose one option.

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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Which one of the following statements is CORRECT with respect to endosperm development? It originates

Your answerChoose one option.

from the fusion product of three haploid nuclei - one from male gametophyte and two from the female gametophyte

from the fusion product of three haploid nuclei - two from male gametophyte and one from the female gametophyte

from the fusion product of two haploid nuclei - one from male gametophyte and one from the female gametophyte

by a phenomenon called apomixis

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Identify the CORRECT statement.

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Receptor-like kinases play role in gametophytic self-incompatibility in Brassicaceae

Receptor-like kinases play role in sporophytic self-incompatibility in Solanaceae

Ribonucleases play role in sporophytic self-incompatibility in Brassicaceae

Ribonucleases play role in gametophytic self-incompatibility in Solanaceae

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Identify the INCORRECT statement in connection with polar transport of auxin.

Your answerChoose one option.

The putative influx carrier AUX1 is a cytosolic protein

Polar auxin transport in root tends to be both acropetal and basipetal in direction

Naphthylphthalamic acid (NPA) is an inhibitor of polar auxin transport

AUX1 and PIN1 proteins are located in the opposite ends of a cell for polar transport

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A typical floral meristem differs from shoot apical meristem on the basis of

Your answerChoose one option.

Determinate growth

Presence of auxin

Presence of stem cells

Negative geotropism

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In a typical sexually reproducing angiospermic plant, if an endosperm cell contains

nucleotide pairs of DNA, then a microspore of this plant will have ______

nucleotide pairs of DNA.

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GATE XL Plant development; cell and tissue morphogenesis PYQs

Question 13

Question 17

Question 3

Question 12

Question 17

Question 4

Question 8

Question 39

Question 50