Exercise 1

Question 26 :

Placenta is the structure formed

A). by the union of foetal and uterine tissue
B). by foetus only
C). by fusion of germ layers
D). None of these
Answer : Option A

Question 27 :

Plants hormone that induces cell division is

A). auxins
B). gibberellins
C). kinins
D). domins
Answer : Option C

Question 28 :

Neurospora is used as genetic material because

A). it has short life cycle of 10 days
B). the product of single meiosis can be easily analysed
C). meiotic products are linearly arranged in the form of ordered tetrads
D). is a diploid fungus
Answer : Option A

Question 29 :

Phloem is a tissue found in

A). reproductive organs of animals
B). plants
C). insects
D). mammals
Answer : Option B

Question 30 :

N2 content is kept constant in the biosphere due to

A). N2 fixation
B). industrial pollution
C). nitrogen cycle
D). absorption of N2
Answer : Option C