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

Questions 1–10 of 29. Imported answers require independent review unless marked reviewed.

If an endosperm cell of a typical diploid angiosperm species has 15 chromosomes, then the number of chromosomes in a microspore mother cell of this species under normal circumstances would be__________ (in integer).

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Which one of the following class(es) of genes, when deleted, would result in sepal formation in all the floral whorls of Arabidopsis, as per the rules of the typical ABC model of floral organ patterning?

Your answerChoose one option.

Class A only

Class A and class B

Class B and class C

Class B only

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Two genes X and Y are involved in root development in such a way that all the following three homozygous mutants show rootless phenotype.

(i) Gain-of-function mutant of X (ii) Loss-of-function mutant of Y (iii) Double mutant of gain-of-function of X and loss-of-function of Y

Which one of the following genetic pathways best describes these observations?

Your answerChoose one option.

X suppresses Y and Y promotes root development

X promotes Y and Y promotes root development

X suppresses Y and Y suppresses root development

X promotes Y and Y suppresses root development

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Correctly match the carnivorous plants (Group I) with the organs (Group II) they modify to trap the prey.

Group I: (P) Pitcher plant (Nepenthes); (Q) Bladderwort (Utricularia); (R) Sundew (Drosera); (S) Venus flytrap (Dionaea). Group II: (1) Leaf; (2) Fruit; (3) Stem; (4) Tendril.

Your answerChoose one option.

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

P-1; Q-1; R-1; S-1

P-2; Q-2; R-2; S-2

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

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Consider a diploid plant species where the cells in the epidermis (the outermost single cell layer) always divide in the anticlinal orientation. If one such cell within the central zone of the shoot apical meristem (SAM) spontaneously becomes tetraploid at the seedling stage, which one of the following cellular arrangements would be most likely observed if the meristem is examined at the adult stage?

Your answerChoose one option.

Only one tetraploid cell in the epidermis

Many tetraploid cells in the epidermis

All cells in the entire SAM tetraploid

All cells in the entire SAM diploid

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Correctly match the following Arabidopsis genes (Group I) and the biological processes they primarily regulate (Group II).

Group I: (P) CLAVATA3; (Q) CONSTANS; (R) SCARECROW; (S) AGAMOUS. Group II: (1) Organ identity in flower; (2) Cell-type specification in root meristem; (3) Meristem size in shoot; (4) Photoperiodic floral transition

Your answerChoose one option.

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

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

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

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

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Which of the following tissue types is/are established during embryogenesis in wild-type Arabidopsis thaliana?

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

Shoot apical meristem

Rosette leaf primordium

Procambium

Lateral root primordium

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In wild-type Arabidopsis thaliana, the four types of floral organs (sepal, petal, stamen, carpel) are arranged in concentric whorls from outside to inside. With reference to the ABC model of floral organ patterning, match the homeotic mutants in Group 1 with their respective arrangements of organs in the four whorls given in Group 2.

Your answerChoose one option.

P–iv, Q–ii, R–i

P–iii, Q–i, R–ii

P–ii, Q–i, R–iii

P–iii, Q–i, R–iv

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The schematic depicts an unexpanded plant cell within a hypocotyl with the arrangement of cellulose microfibrils marked on its cell wall.

Which one of the following shapes would most likely result from the expansion of this cell if the pattern of the cellulose fibers does not change?

Your answerChoose one option.

Diagram for Life Sciences question 50 (figure 2)

Diagram for Life Sciences question 50 (figure 3)

Diagram for Life Sciences question 50 (figure 4)

Diagram for Life Sciences question 50 (figure 5)

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Which one or more of the following statements is/are NOT CORRECT with respect to pollen development in angiosperm?

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

Tapetal cell wall in all angiosperms breaks down to release the cytoplasmic content.

Tapetal cell wall in all angiosperms remains intact.

Tapetal cell wall breaks down in some angiosperm species, whereas it remains intact in others.

Within an angiosperm species, the tapetal cell wall breaks down in some individuals and not in others.

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GATE XL Plant development; cell and tissue morphogenesis PYQs

How to practice Plant development; cell and tissue morphogenesis

Question 54

Question 55

Question 60

Question 49

Question 56

Question 60

Question 49

Question 55

Question 50

Question 51