NCERT Important Questions Class 9 Science biology Chapter 7
Important NCERT Extra Questions
Chapter 7 Diversity in Living Organisms
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Differentiate the nature of skin in four-classes of tetrapoda.
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The nature of skin in four classes of tetrapoda are:
(i) Class Amphibia – Thin, moist, glandular and respiratory skin.
(ii) Class Reptilia – Dry and non-glandular skin with horny scales or scutes.
(iii) Class Aves – Dry and non-glandular skin with feathers.
(iv) Class Mammalia – Glandular skin with hairs.