2021 · Paper 1

Complete GATE XL 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice

Questions 49–51 of 125. Imported answers require review unless explicitly marked reviewed.

Question 4

Open question

XL-RMCQ1 markNeeds review

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

Your answerChoose one option.

A.

Chromoplast

B.

Amyloplast

C.

Chloroplast

D.

Etioplast

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Question 5

Open question

XL-RMCQ1 markNeeds review

Phytoalexins play important role in plant defense against pathogens. Choose the INCORRECT option related to phytoalexins.

Your answerChoose one option.

A.

Phytoalexins belong to secondary metabolites.

B.

Phytoalexins have antifungal activity.

C.

Phytoalexins are abundant in plants under normal condition.

D.

Different hosts produce phytoalexins of varying chemical nature.

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Question 6

Open question

XL-RMCQ1 markNeeds review

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.

A.

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

B.

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

C.

Both red and far-red light inhibit seed germination.

D.

Both red and far-red light induce seed germination.

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