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1. Animals undergo an inactive stage during the winter known as

2. The basic unit of study in ecology is

3. Xerophytes are mostly

4. A large regional unit characterised by a major vegetation type and associated fauna found in a specific climate zone constitutes

5. The plants of this group are adapted to live partly in water and partly above the substratum and free from water:

6. Broad-leaved oak forests are found in

7. Organisms capable of maintaining constant body temperature are

8. Excessive aerenchyma is a characteristic feature of

9. Cold-blooded animals fall under the category of

10. Biological organisation starts with