Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

What will happen if the deer is missing in the food chain given below?
Grass $\to$ Deer $\to$ Tiger

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

In the following groups of materials,which group$(s)$ contains only non-biodegradable items?
$(i)$ Wood,paper,leather
$(ii)$ Polythene,detergent,$PVC$
$(iii)$ Plastic,detergent,grass
$(iv)$ Plastic,bakelite,$DDT$

Name the wastes which are generated in your house daily. What measures would you take for their disposal?

Which of the following are always at the second trophic level of food chains?