Nootan Biology Class 12. We covered all the Nootan Biology Class 12 MCQs in this post for free so that you can practice well for the exam.
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Nootan Biology Class 12 Objective for Students
What is meant by double fertilization?
(a) Fusion between egg and male gamete.
(b) Fusion between secondary nucleus and male gamete.
(c) Both ‘a’ and ‘b’
(d) Formation of two zygotes.
Option c – Both ‘a’ and ‘b’
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called?
(a) Autogamy
(b) Geitonogamy
(c) Xenogamy
(d) None of the above
Option b – Geitonogamy
In a bisexual flower, if androecium and gynoecium mature at different times, the phenomenon is known as:
(a) Dichogamy
(b) Herkogamy
(c) Heterogamy
(d) Monogamy
Option a – Dichogamy
In some plants, the flower is modified in such a way that it looks like a female insect and attracts a male insect. This modification is used for pollination and occurs commonly in:
(a) Orchids
(b) Wheat
(c) Maize
(d) Mango
Option a – Orchids
Flowers in which pollination takes place through insects have pollen grains that are:
(a) Smooth and dry
(b) Rough and sticky
(c) Rough and dry
(d) Large in size
Option b – Rough and sticky
Pollination by birds is called:
(a) Anemophily
(b) Entomophily
(c) Autogamy
(d) Ornithophily
Option d – Ornithophily
Pollens are produced in:
(a) Corolla
(b) Style
(c) Stigma
(d) Anther
Option d – Anther
Which one of the following agents does not contribute to the propagation of plants through seed dispersal?
(a) Wind
(b) Fungus
(c) Animal
(d) Water
Option b – Fungus
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