Biology - Questions (Section-1)
25N2 content is kept constant in the biosphere due to
A. N2 fixationB. industrial pollution
C. nitrogen cycle D. absorption of N2
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26Neurospora is used as genetic material because
A. it has short life cycle of 10 daysB. 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
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27O2 released in the process of photosynthesis comes from
A. CO2B. water
C. sugar D. pyruvic acid
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28Phloem is a tissue found in
A. reproductive organs of animalsB. plants
C. insects D. mammals
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29Placenta is the structure formed
A. by the union of foetal and uterine tissueB. by foetus only
C. by fusion of germ layers D. None of these
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30Plants hormone that induces cell division is
A. auxinsB. gibberellins
C. kinins D. domins
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