Biology MCQs

Question 1

Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of

Accepted Answer

enzymes

Answer

hormones

Answer

proteins

Answer

vitamins

Question 2

Mutation is

Accepted Answer

a change that is inherited

Answer

a factor responsible for plant growth

Answer

a change which affects the offspring of F2 generation only

Answer

a change which affects the parents

Question 3

Pollination by wind is called

Accepted Answer

anemophily

Answer

hydrophily

Answer

zoophily

Answer

entomophily

Question 4

Pollen grains in plants are produced in

Accepted Answer

flower

Answer

roots

Answer

leaves

Answer

stem

Question 5

Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

Accepted Answer

By denitrification

Answer

By cyanobacteria

Answer

By electrical discharges in the atmosphere

Answer

By industrially synthesised fertilizer

Question 6

Ptyalin is an enzyme produced in the

Accepted Answer

salivary glands

Answer

pituitary glands

Answer

thyroid glands

Answer

pancreas

Question 7

Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes

Accepted Answer

cholera

Answer

tetanus

Answer

influenza

Answer

typhoid

Question 8

Biotic component of the environment does not include-

Accepted Answer

Soil system

Answer

Animal system

Answer

Micro-organism system

Answer

Plant system

Question 9

Reflex actions are controlled by :

Accepted Answer

The Spinal Chord

Answer

The cells

Answer

The Brain

Answer

The Nerves