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Page No 94: - Chapter 7 Diversity In Living Organisms class 9 ncert solutions Science - SaraNextGen [2024]


Question 1:

How do poriferan animals differ from coelenterate animals?

Answer:

Porifera

Coelenterate

They are mostly marine, non-motile, and found attached to rocks.

They are exclusively marine animals that either live in colonies or have a solitary life-span.

They show cellular level of organisation.

They show tissue level of organisation.

Spongilla, Euplectella, etc. are poriferans.

Hydra, sea anemone, corals, etc. are coelenterates.

Question 2:

How do annelid animals differ from arthropods?

Answer:


 

Annelids

Arthropods

The circulatory system of annelids is closed.

Arthropods have an open circulatory system.

The body is divided into several identical segments.

The body is divided into few specialized segments.

Question 3:

What are the differences between amphibians and reptiles?

Answer:

Amphibian

Reptiles

They have a dual mode of life.

They are completely terrestrial.

Scales are absent.

Skin is covered with scales.

They lay eggs in water.

They lay eggs on land.

It includes frogs, toads, and salamanders.

It includes lizards, snakes, turtles, chameleons, etc.

Question 4:

What are the differences between animals belonging to the Aves group and those in the mammalia group?

Answer:

Aves

Mammals

Most birds have feathers and they possess a beak.

They do not have feathers and the beak is also absent.

They lay eggs. Hence, they are oviparous.

Some of them lay eggs and some give birth to young ones. Hence, they are both oviparous and viviparous.

Also Read : Page-No-97:-Chapter-7-Diversity-In-Living-Organisms-class-9-ncert-solutions-Science

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