Question

How many statement(s) is/are incorrect?
(a) Mammals from colder region generally have shorter ears and limbs
(b) It is at population level that natural selection operates to evolve desired traits
(c) Electrostatic precipitator can remove 99% gaseous pollutant present in exhaust
(d) Particulate size 2.5µm or less in diameter are not harmful for human health

• A. a and b
• B. a, b, c
• C. c and d
• D. a, b, d

Answer 1

The correct option is C c and d

In order to reduce heat dissipation, mammals in colder regions generally have shorter ear pinna and limbs.

Natural selection operates at population level to aid evolution of desired traits.

An electrostatic precipitator can remove over 99% particulate matter present in the exhaust. It can not genearlly remove gaseous pollutants present in exhaust.

Particulate size 2.5µm or less in diameter are harmful for human health.