Botany : Plants :: Entomology : ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Insects
The pair is a branch of science : what it studies. Botany is the study of plants; in the same way, entomology is the study of insects (from the Greek entomon, insect).
Why the other options are incorrect
Option (1) Germs — Incorrect. Germs (micro-organisms) are studied in microbiology.
Option (2) Birds — Incorrect. The study of birds is ornithology.
Option (4) Snakes — Incorrect. Snakes come under herpetology, the study of reptiles and amphibians (ophiology for snakes alone).