Question 1-2 of 3: Stress Response (Microbial Physiology) | SWAYAM Cell Biology | Includes PYQs | Get Solutions with Detailed Explanations

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Question 1

Microbial PhysiologyStress Response

MCQ

Read the question, then carefully choose the correct answer(s).

Appeared in Year: 2023

During water stress, ABA increases dramatically in leaves causing stomatal closure. Given below are the various events involved in this process.

A. Opening of plasma membrane Ca^{2 +} permeable ion channels and elevation of cytosolic Ca^{2 +}

B. Activation of plasma membrane anion channels, efflux of anions and potassium ions.

C. Binding of ABA to cytosolic ABA receptor and inhibition of activity of Type 2 C protein phosphatases (PP₂Cs).

D. Phosphorylation and activation of NADPH oxidases (RBOH) and formation of apoplastic

ROS.

Which one of the following options represents the correct sequence of events involved? (June)

Choices

Choice (4)		Response
a.	C, D, B, A
b.	A, C, D, B
c.	C, D, A, B
d.	A, B, C, D

Question 2

Microbial PhysiologyStress Response

Match List-1 with List-2

Match items in List-1 with List-2, then choose the correct option.

Appeared in Year: 2023

Behavioral and cognitive responses in organisms are finely tuned to environmental cues. Given below is a list of specific hormone/chemical signals (Column X) and biological functions (Column Y). (June)

List-Ⅰ (Hormone/Chemical Signals)	List-Ⅰ (Functions)
(A) Adrenaline	(I) movement and coordination
(B) Melatonin	(II) stress response
(C) Dopamine	(III) sleep-wake cycle
(D) Cortisol	(IV) flight or fright response

Choices

Choice (4)		Response
	(A) (B) (C) (D)
a.	(II) (III) (IV) (I)
b.	(II) (III) (I) (IV)
c.	(I) (IV) (II) (III)
d.	(IV) (III) (I) (II)