In the following food chain, only $2\text{J}$ of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.

GRASS $\rightarrow$ GRASS HOPPER $\rightarrow$ FROG $\rightarrow$ SNAKE $\rightarrow$ PEACOCK

(a) Garbage: Garbage refers to the waste materials generated during our daily activities that are discarded or thrown away (e.g., kitchen waste, paper, plastic packaging, etc.).

Garbage is classified into two main classes:

1. Biodegradable waste: Substances that can be broken down into simpler, harmless substances by biological processes (action of microorganisms like bacteria and fungi).
2. Non-biodegradable waste: Substances that cannot be broken down by biological processes and persist in the environment for a long time.

(b) Specificity of Enzymes: Enzymes are biological catalysts that are highly specific in their action. This means that a particular enzyme can only act on and break down a specific substance (substrate) because of its unique chemical structure. For example, the enzymes in our digestive system cannot break down human-made materials like plastics or substances like coal because we do not possess the specific enzymes required to break their chemical bonds.