CBSE Class 11-science Biology Chordata

• state the important of air bladder in Pisces.
• Is development direct or indirect in cnidaria and chondrichthyes and cyclostomata? Is fertilization external or internal in cnidaria, annelida and cyclostomata?
• Name the fish which has an electric organ.
• Why do cartilaginous fish swim constantly?
• Name the organ which regulates buoyancy in Rohu.
• Which two sub-phyla are collectively referred to as protochordates?
• Name the reptile which has a four-chambered heart.
• State the difference between urochordates and cephalochordates with reference to the notochord.  
• What is the most unique characteristic of mammals?
• Enlist the characteristic features of Petromyzon as representative of class Cyclostomata.

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