set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Who has proposed for the first time the double helix model of DNA?

a) Lamark and Darwin

b) Watson and Crick

c) Fisher and Haldoni

d) Hugo de Vries

Question : 2

The American multinational company, Monsanto, has produced an insect-resistant cotton variety that is undergoing field trials in India. A toxin gene from which one of the following bacteria has been transferred to this transgenic cotton?

a) Bacillus amyloliquifaciens

b) Bacillus subtilis

c) Bacillus thuringiensis

d) Bacillus globlii

Question : 3

The micro-organism which is associated with the production of Bt cotton is a

a) Blue-green algae

b) Fungus

c) Bacterium

d) Virus

Question : 4

James D. Watson and Francis Crick are associated with the discovery of

a) Anti-malarial drugs

b) Vaccine

c) Structure of DNA

d) Penicillin

Question : 5

Assertion (A) :
In human beings, the female play a major role in determining the sex of the offspring.
Reason (R) :
Women have two X-chromosomes.

a) A is true, but R is false

b) Both A and R are true and R is the correct explanation of A

c) Both A and R are true, but R is not a correct explanation of A

d) A is false, but R is true

Question : 6

Generally, Orobanche weed is found in

a) Rice field

b) Tobacco field

c) Gram field

d) Wheat field