• Biology - Section 1

O2 released in the process of photosynthesis comes from

A. CO2
B. water
C. sugar
D. pyruvic acid


Plants hormone that induces cell division is

A. auxins
B. gibberellins
C. kinins
D. domins


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


N2 content is kept constant in the biosphere due to

A. N2 fixation
B. industrial pollution
C. nitrogen cycle
D. absorption of N2


Phloem is a tissue found in

A. reproductive organs of animals
B. plants
C. insects
D. mammals