The density of a population in a given habitat during a given period fluctuates due to changes in:
(A) Natality
(B) Emigration
(C) Immigration
(D) Mortality
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (B), (C), (D)
Population density changes through four basic processes: two add individuals and two remove them.
(A) Natality — Changes density. Births add individuals.
(B) Emigration — Changes density. Individuals leave the habitat.
(C) Immigration — Changes density. Individuals of the same species come in from elsewhere.
(D) Mortality — Changes density. Deaths remove individuals.
Note: The same question was also asked in CUET (UG) 2025 on 29-05-2025 (Slot 1), and a similar question in CUET (UG) 2026 on 30-05-2026 (Slot 2) and on 22-05-2026 (Slot 1).
NCERT Extract:
Population Growth –
