One of the following is not a biodegradable material. This one is:

Which of the following group of organisms are not constituents of a food chain?

(i) Grass, lion, rabbit, wolf

(ii) Plankton, man, fish, grasshopper

(iii) Wolf, grass, snake, tiger

(iv) Frog, snake, eagle, grass, grasshopper

In the figure given alongside, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available?

Which of the following is not a non-biodegradable material?

The use of one of the following will pollute the environment. This one is: