biology general knowledge questions

25.

O2 released in the process of photosynthesis comes from
A.     CO2    B.     water
C.     sugar    D.     pyruvic acid
Answer & Explanation

Answer: Option B

Explanation:

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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 & Explanation

Answer: Option A

Explanation:

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27.

Plants hormone that induces cell division is
A.     auxins    B.     gibberellins
C.     kinins    D.     domins
Answer & Explanation

Answer: Option C

Explanation:

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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 & Explanation

Answer: Option A

Explanation:

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29.

Phloem is a tissue found in
A.     reproductive organs of animals
B.     plants
C.     insects
D.     mammals
Answer & Explanation

Answer: Option B

Explanation:

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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 & Explanation

Answer: Option C

Explanation:

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