GATE XL 2023 Paper 1 — page 17

Questions 49–51 of 122. Imported answers require review unless explicitly marked reviewed.

Although Pseudomonas syringae infection in plants is actively inhibited by the endogenous salicylic acid (SA) of host origin, a successful infection is still established because the bacterium secretes coronatine, an effector molecule. Which one of the following best describes the mode of action of coronatine?

Your answerChoose one option.

Coronatine inhibits SA biosynthesis.

Coronatine promotes the biosynthesis of jasmonic acid (JA), and JA signal in turn inhibits SA response.

Coronatine is a structural analogue of SA, which binds to the SA receptor and inhibits its function.

Coronatine is a structural analogue of jasmonic acid (JA), which activates JA signaling to inhibit SA response.

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

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)

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

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.

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

2023 · Paper 1

Question 49

Question 50

Question 51