GATE XL Plant development; cell and tissue morphogenesis PYQs & Answers — Page 2

Questions 11–20 of 29. Imported answers require independent review unless marked reviewed.

The ovule of a diploid species with 2n = 8 undergoes double fertilization. If the pollen is contributed by an individual with meiotic nondisjunction, the chromosome number of the zygote will be __________.

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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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‘Quiescent Center’ is present in

Your answerChoose one option.

leaf meristem

root apical meristem

shoot apical meristem

floral meristem

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An Arabidopsis thaliana mutant plant developed defective flowers with altered floral organ identity and patterning. In this mutant, the four floral whorls contain Sepal-Sepal-Carpel-Carpel, from the periphery to the center of the flower.

Based on the typical ABC model of floral organ patterning, which among the following are mutated in this plant?

Your answerChoose one option.

Class A gene(s)

Class B gene(s)

Class C gene(s)

Double mutant for Class A and Class C genes

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What plants treated with prolonged cold temperature at the seedling stage flower earlier than the untreated control. Seeds collected from these treated individuals, however, give rise to plants that do not flower early. This phenomenon is called

Your answerChoose one option.

vernalization.

temperature acclimation.

photoperiodism.

adaptation.

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Which ONE of the following organelles controls gravitropism in the roots of higher plants?

Your answerChoose one option.

Chromoplast

Amyloplast

Chloroplast

Etioplast

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The figure shows the germination percentage of imbibed seeds treated with the given sequence of red (R) and far-red (F) light (each exposure lasting 5 min). The percentage of germination was scored after 72 hours in darkness at 25 °C. Based on this, which ONE of the following options is CORRECT?

Your answerChoose one option.

Red light induces seed germination whereas far-red light inhibits it.

Red light inhibits seed germination whereas far-red light induces it.

Both red and far-red light inhibit seed germination.

Both red and far-red light induce seed germination.

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The structures of four plant hormones are shown. Identify the CORRECT hormone that is responsible for bending of coleoptile of canary grass in response to unidirectional white light.

Your answerChoose one option.

Diagram for Life Sciences question 7 (figure 2)

Diagram for Life Sciences question 7 (figure 3)

Diagram for Life Sciences question 7 (figure 4)

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In spiral phyllotaxis, leaves are initiated sequentially on the meristem with two successive primordia being separated by golden angle. If a plant follows right-handed spiral phyllotaxis when looked down the meristem, then the angle between two successive leaves would be ________ degrees (with correct sign, round off to one decimal place).

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Match the cell/tissue types in GROUP I with their corresponding total DNA content in GROUP II of a typical diploid Angiosperm species and choose the CORRECT option (C denotes DNA content in haploid genome).

GROUP I (P) Pollen tube (Q) Megaspore mother cell (R) Synergid (S) Embryo sac prior to fertilization

GROUP II (1) 1C (2) 2C (3) 3C (4) 4C (5) 8C

Your answerChoose one option.

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

P-2, Q-2, R-1, S-5

P-1, Q-2, R-1, S-5

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

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GATE XL Plant development; cell and tissue morphogenesis PYQs

Question 54

Question 59

Question 48

Question 55

Question 1

Question 4

Question 6

Question 7

Question 10

Question 11