Which of the following is an example of non-biodegradable waste?

What will happen to the garbage,and dead plants and animals in the absence of decomposers?

Which of the following is an example of biodegradable waste?

In the given food chain,suppose the amount of energy at the fourth trophic level is $5 \, kJ$,what will be the energy available at the producer level (in $, kJ$)?
Grass $\to$ Grasshopper $\to$ Frog $\to$ Snake $\to$ Hawk

What are the by-products of fertiliser industries? How do they affect the environment?

Select the mismatched pair in the following and correct it.
$(a)$ Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain
$(b)$ Ecosystem — Biotic components of environment
$(c)$ Aquarium — $A$ man-made ecosystem
$(d)$ Parasites — Organisms which obtain food from other living organisms