Which branch of biology deals with the study of animal behavior? MCQ with Answer and Explanation

Explanation:
A food chain is a linear sequence showing the transfer of energy and matter from one organism to another through consumption. A food web is a complex, interconnected network of multiple food chains, representing the realistic feeding relationships in an ecosystem. Decomposers (bacteria and fungi) are saprotrophs that break down dead organic matter; primary producers are autotrophs (plants, algae) that synthesize their own food. Thus, statements 1 and 2 are correct.

Explanation:
Polymerase chain reaction (PCR) uses Taq polymerase and primers to exponentially amplify a target DNA segment in vitro.

Explanation:
Mitochondria are known as the powerhouse of the cell because they are the site of aerobic respiration and ATP production. They are semi-autonomous because they possess their own circular DNA, RNA, and 70S ribosomes, allowing them to synthesize some of their own proteins and replicate independently of the nucleus.