Application Based Questions
Q.1. Define evolution.
Ans. Evolution is defined as the study of origin of newer types of organisms from the previous ones by modifications involving genetic changes and adaptation.
Q.2. Protochordates possess a notochord in larval forms. Appraise the use of this feature in these animals.
Ans. The notochord is a long rod-like support structure (chord = string) that runs along the back of the animal separating the nervous tissue from the gut. It provides a place for muscles to attach for ease of movement.
Q.3. Justify giving one reason : crocodiles have fourchambered heart, but are still reptiles.
Ans. Crocodiles have four-chambered heart, but are still reptiles as they lay eggs with tough coverings and do not need to lay their eggs in water, unlike amphibians.
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