Q4 of 525 Page 233

List in the tabular form any three differences between the Aves and Mammalia group.

Differences between the Aves and Mammalia group:



















Aves



Mammalia



Body is covered with feathers.



Body is covered with hairs.



Bones are hollow with air cavity for flying.



Bone is not hollow.



They are oviparous.



They are viviparous with few exceptions




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2

In which class would you place any organism which has

(i) a scaly exoskeleton and a bony endoskeleton


(ii) a scaly exoskeleton and lay eggs outside water?

 3

List three groups of plants. Which plants are referred to as vascular plants? Out of these which group is further classified on the basis of number of cotyledon? State its two characteristics.

 5

Identify the plant bodies, which are commonly named as “cryptogamae”. State and explain two characteristics which are exhibited by each category of these plant bodies.

 6

(i) Draw a neat diagram of Hydra.

(ii) Label mesoglea and gastrovascular cavity


(iii) Name the group of animals it belongs to.


(iv) Name one species of this group that lives in colonies.