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A: Chitinous exoskeleton is a characteristic feature of arthropods. R: It allows diffusion of water vapour from atmosphere to the body.

Monjur Alahi

A: Chitinous exoskeleton is a characteristic feature of arthropods.
R: It allows diffusion of water vapour from atmosphere to the body.
A. If both assertion & reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both assertion & Reason are true but the reason is not the correct explanation of the assertion, them mark (2).
C. If assertion is true statement but reason is false, them mark (3).
D. If both assertion and reason are false statements, them mark (4).


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1 Answers

Salim Ahmed Kawsar

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Correct Answer - C
If assertion is true statement but reason is false, them mark (3).

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Which of the following is not a characteristic feature during mitosis in somatic cells? 

The correct answer is (B) Synapsis

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Explain the term atmosphere. List the layers of the atmosphere.

The invisible and odorless gas which we breathe, which sustains life and produces an infinite variety of phenomena is what we call air. The envelope of air surrounding the earth...

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Body segment of cockroach is covered by these four chitinous plates.

Dorsal tergum, ventral sternum and two lateral pleurons.

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Write a short note on exoskeleton of cockroach.

Exoskeleton: Tough, waxy, non-living chitinous exoskeleton protects the body of the cockroach. It is made up of nitrogenous polysaccharide – chitin that provides strength, elasticity and surface area for attachment of...

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Circlet of six chitinous teeth and backwardly directed bristles are present in _____ .

The correct answer is (D) gizzard

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Read the statements about micro arthropods. P) They increase soil fertility. 

C) Both P and Q are correct

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What is difference between endoskeleton and exoskeleton?

The supportive structures present inside the body form the endoskeleton and when the supportive structures are present on the outer surface of the body they form exoskeleton.

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C) Desert ecosystem

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In ______ the exoskeleton is absent.

Correct Answer - Amphibia

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The presence of tube feet is the characteristic feature of phylum

Correct Answer - D In whale Retea mirabilia are present which store extra oxygen and help the animal to remain under water for some time

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