Choose the word that is opposite in meaning to the given word
Establish
a) Disturb
b) Uproot
c) Protect
d) Negate

Hint: Establish refers to setting up something as a beginning to it. Its opposite should therefore mean the end of something.

Complete answer:
Opposites or antonyms are words that mean contrasting to the given word. We use the given term ‘establish’ to refer to the commencement of something, particularly a firm or an organization. It also refers to initializing a process.
Example: The institute was established in 1956 by the then President of India.
Its opposite should therefore indicate on bringing down an established set up. That being the case, ‘uproot’ in option b gives the right antonym. Uproot is a verb that means to remove something from its place of existence and hence the correct opposite.
Disturb in option a is wrong because it means to interfere or disarrange a normal arrangement and cause distraction. Example: The meeting was disturbed by the loud noise.
Similarly, option c is also wrong. We use ‘protect’ to denote safeguarding someone or something from an injury or attack. Example: A father always protects his children.
Option d cannot be the appropriate opposite word for ‘establish.’ Negate is used as a verb to nullify or invalidate something from not happening. Example: Let’s not negate its demerits.

Note: Demolish, disapprove, and disband also indicates the opposite to establish. We use ‘uproot’ to describe the pulling out of the trees.