Page No 94: - 7) DIVERSITY IN LIVING ORGANISMS
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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. |
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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. |
