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Question
State the number of sets of chromosomes present in a zygote.
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Solution
Zygote has 2 sets of chromosomes alternatively accept 2n.
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RELATED QUESTIONS
Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
The length of pollen tube depends on the distance between :
(a) pollen grain and upper surface of stigma
(b) pollen grain on upper surface of stigma and ovule
(c) pollen grain in anther and upper surface of stigma
(d) upper surface of stigma and lower part of style
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
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Draw a neat and labelled diagram.
Double fertilization in angiosperms
Which of the following are the chemical components of the wall of pollen tube?
How many middle layers are generally present in the wall of the anther lobes?
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Double fertilization is exhibited by ______
Type of sexual reproduction is ______.
