Chapter 7: Diversity in Living Organisms- Exercise- 94

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Chapter 7: Diversity in Living Organisms

Class: IX

Exercise number 94

 

Question 1

How do poriferan animals differ from coelenterate animals?

Answer 1

Porifera body has numerous pores, but these pores are absent in coelenterates body.

Coelenterates has a cavity in their body, while it is absent in body of porifera.

Question 2

How do annelid animals differ from arthropods?

Answer 2

Segmented body in annelids, while true segmentation is absent in arthropods. Arthropods have

joined appendages, which are absent in annelids.

Question 3

What are the differences between amphibians and reptiles?

Answer 3

 Amphibians need water to lay eggs and in them fertilization is external. Reptilians do not need

water to lay eggs and in them fertilization is internal.

 Amphibians use both lungs and for breathing. But reptilians can breathe using lungs only.

Question 4

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

Answer 4

 In aves, body is covered with feathers; while in mammals, body is covered with hairs.

 Mammary glands are absent in aves while present in mammals.

 Forelimbs of aves are modified into wings which is not the case in mammals.

 Aves are oviparous, while most of the mammals are viviparous.