Generally the food chain has how many trophic levels?
1). One
2). Two
3). Three
4). Three or four
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1. Cooking gas is a mixture of
2. An example of replenshible energy source is
3. Nonstick kitchenwares are coated with
4. Which one of the following elements is least likely to be found in commercial fertilisers?
5. Ozone depletion in the atmosphere is mainly caused by
6. Moving electric charge produces :
7. The different colours of different stars are due to the variation of
8. The gas that is used in the manufacture of vanaspati ghee is :
9. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :