100 Best Biology MCQ
Q25). O2 released in the process of photosynthesis comes from
a).CO2
b).water
c).sugar
d).pyruvic acid
Correct Answer:
water
Explaination:
Q26). 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:
Q27). Plants hormone that induces cell division is
a).auxins
b).gibberellins
c).kinins
d).domins
Correct Answer:
kinins
Explaination:
Q28). 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:
Q29). Phloem is a tissue found in
a).reproductive organs of animals
b).plants
c).insects
d).mammals
Correct Answer:
plants
Explaination:
Q30). N2 content is kept constant in the biosphere due to
a).N2 fixation
b).industrial pollution
c).nitrogen cycle
d).absorption of N2
Correct Answer:
nitrogen cycle
Explaination:
Q31). Out of proteins, lipids and carbohydrates present in a cell membrane, what is true?
a).Lipids are maximum
b).Carbohydrates are minimum
c).Carbohydrates are maximum
d).All three are in equal proportion
Correct Answer:
Carbohydrates are minimum
Explaination:
Q32). Potato is a modified form (outgrowth) of
a).root
b).stem
c).fruit
d).leaf
Correct Answer:
stem
Explaination: