Occurrence of Zoochlorellae in the body wall of Hydra is an example of
1). a predation
2). a food chain involving a parasite
3). commensalism
4). mutualism
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2. Which one of the following organic compounds has fruity smell?
3. The anode in a dry cell consists of
4. Which halide is used in making sensitive emulsion on photograhic film?
5. The electronic configuration of an atom having atomic number 20 is
6. An example of semiconductor is
7. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas)?