100 Best Biology MCQ

Q73). Plants that grow in saline water are called

a).halophytes
b).hydrophytes
c).mesophytes
d).thallophytes

Correct Answer:
halophytes
Explaination:

Q74). Pyorrhoea is a disease of the

a).nose
b).gums
c).heart
d).lungs

Correct Answer:
gums
Explaination:

Q75). O released in the process of photosynthesis comes from

a).CO
b).water
c).sugar
d).pyruvic acid

Correct Answer:
water
Explaination:

Q76). 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

Correct Answer:
by the union of foetal and uterine tissue
Explaination:

Q77). Plants hormone that induces cell division is

a).auxins
b).gibberellins
c).kinins
d).domins

Correct Answer:
kinins
Explaination:

Q78). 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

Correct Answer:
it has short life cycle of 10 days
Explaination:

Q79). Phloem is a tissue found in

a).reproductive organs of animals
b).plants
c).insects
d).mammals

Correct Answer:
plants
Explaination:

Q80). N content is kept constant in the biosphere due to

a).N fixation
b).industrial pollution
c).nitrogen cycle
d).absorption of N

Correct Answer:
nitrogen cycle
Explaination: