Q4 of 35 Page 128

What is called as ‘black gold’?

Due to its great commercial importance petroleum is also called ‘black gold’.

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2

Which of the following constitutes a food chain?

 3

Which of the following are environmental friendly practices?

 5

Based on the food chain, pick the odd one out:

plants → grasshopper → frog → tiger → snake

 6

Example for product of green chemistry is _____________.