Q2 of 525 Page 233

| Identify two features possessed by all chordates.

All chordates possess the following features:

(I) have a notochord


(II) have a dorsal nerve cord


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52

What is the major characteristic of mammals?

 1

What is symbiosis? Name a symbiotic life form. Mention specific organisms which display the symbiotic relationship in this life form.

 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.