Stress Physiology and Senescence - Plant Physiology and Biochemistry - Life Sciences Previous Year Questions

1

2010 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2010

Which of the following statements is CORRECT?

A

Plants adapted to cold environment have higher ratio of “unsaturated to saturated” fatty acids in their membrane compared to those adapted to hot environment

B

Plants adapted to cold environment have lower ratio of “unsaturated to saturated” fatty acids in their membrane compared to those adapted to hot environment

C

Plants adapted to cold environment have same ratio of “unsaturated to saturated” fatty acids in their membrane compared to those adapted to hot environment

D

Plants do not have any unsaturated fatty acids in the membrane

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2

2011 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2011

One of the defense mechanisms adopted by plants for detoxification of heavy metals is the synthesis of

A

Phytochelatin

B

Calmodulin

C

Tubulin

D

Systemin

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3

2015 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2015

Which one of the followings is NOT a cryoprotectant for plant tissue?

A

Dimethyl sulfoxide

B

Glycerol

C

Ethylene glycol

D

Liquid nitrogen

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4

2016 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2016

When a plant is infected by a pathogen at one site, the distal parts of the plant and neighboring plants develop increased resistance to subsequent pathogen attack. Which of the following molecules mediates this long-distance signal?

A

Nitric oxide

B

Ethylene

C

Jasmonic acid and its derivatives

D

Salicylic acid and its derivatives

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5

2016 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2016

Consider the following pathway controlling time to flowering in wheat:
[Diagram: Cold temperature → VRN2 gene; VRN2 gene ⊣ VRN1 gene; VRN1 gene → Vegetative growth and Flowering]
If batch P of wheat seed is vernalized before sowing and batch Q is not vernalized, then which of the following statements is most likely to be correct?

A

P will have lower VRN2 transcript and will flower later than Q

B

P will have lower VRN2 transcript and will flower earlier than Q

C

P will have higher VRN2 transcript and will flower later than Q

D

P and Q will have equal VRN2 transcript and will flower at the same time

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6

2018 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2018

Which of the following genera produces dimorphic seeds that help to broaden the time of germination in a variable habitat?

A

Xanthium

B

Pisum

C

Mangifera

D

Linum

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7

2021 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2021

Wheat 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

A

vernalization.

B

temperature acclimation.

C

photoperiodism.

D

adaptation.

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8

2021 · Life Sciences · Plant Physiology and Biochemistry · Stress Physiology and Senescence

Life Sciences (XL) 2021

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

A

Chromoplast

B

Amyloplast

C

Chloroplast

D

Etioplast

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