GATE XL purpose:exam-prep PYQs & Answers — Page 67

Questions 661–670 of 1235. Imported answers require independent review unless marked reviewed.

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.

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

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)

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 cellular component(s) is/are NOT part(s) of cytoskeleton in Angiosperms?

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

Microtubules

Microfilaments

Intermediate filaments

Centrioles

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 enzyme(s), when overexpressed, would result in rice grains with increased β-carotene content?

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

Phytoene synthase

Carotene desaturase

β-glucuronidase

Enolpyruvishikimate-3-phosphate synthase (EPSPS)

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

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).

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

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

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

Match the modified organs in GROUP I with their corresponding prototype forms in GROUP II and choose the CORRECT option.

GROUP I P. Tendrils in grape vine Q. Tendrils in garden pea R. Spines S. Thorns

GROUP II

Modified stem

Modified leaf

Your answerChoose one option.

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

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

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

P-1, Q-1, 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

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)

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

Find the CORRECT match among the plant species in GROUP I, the predominant phytochemical in GROUP II and the economic/medicinal use in GROUP III.

GROUP I P. Syzygium aromaticum Q. Gracilaria sp. R. Catharanthus roseus S. Theobroma cacao T. Papaver somniferum

GROUP II i. Vinciline ii. Eugenol iii. Agar iv. Morphine v. Flavonols

GROUP III

Toothache relief

Desert jelly

Leukaemia treatment

Analgesic

Beverage

Your answerChoose one option.

P-i-1, Q-ii-3, R-iii-4, S-v-5, T-iv-2

P-ii-1, Q-iii-2, R-i-3, S-v-5, T-iv-4

P-ii-1, Q-iii-2, R-iv-4, S-i-3, T-v-5

P-i-2, Q-iii-3, R-iv-1, S-iii-5, T-v-4

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

Match the genetically modified crop in GROUP I with the corresponding genetic element in GROUP II.

GROUP I P. Tomato with delayed fruit ripening Q. Herbicide-resistant soybean R. Insect-resistant cotton S. Soybean with modified oil content

GROUP II

EPS synthase

Δ12-Desaturase

Polygalacturonase

Bt-Cry protein

Your answerChoose one option.

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

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

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

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

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

GATE XL purpose:exam-prep PYQs

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15