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प्रश्न
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
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उत्तर
The zygote is formed by the fusion of a male and a female gamete. Therefore, the number of chromosomes in a zygote is twice as many as that of a gamete, i.e., 48.
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संबंधित प्रश्न
Name the parts labelled as A, B, C and D in the diagram given below:
You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:
I. Soak the gram seeds in plain water and keep them overnight.
II. Cut open a soaked seed and observe its different parts.
III. Take some dry gram seeds in a petri dish.
IV. Drain the excess water.
V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is :
(A) III, I, V, IV, II
(B) III, I, II, IV, V
(C) III, IV, V, I, II
(D) III, I, IV, V, II
Explain what you understand by sexual reproduction.
The process of fusion of the male and female gametes is called ______.
Mature ovary forms the ______.
Fill in the following blank with suitable word :
The name of the structure in the flower in which the male gamete is formed is...........
Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Explain sexual reproduction in plants.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Draw a diagram of the longitudinal section of a flower and label the following parts.
Pollen grains are formed by _________ division in locules of anthers.
Pollen tube reaches the embryo sac via style.
Write the events involved in the sexual reproduction of a flowering plant.
Discuss the first event and write the types.
How many middle layers are generally present in the wall of the anther lobes?
Gloriosa superba exhibits ______.
Sperm and egg nuclei fuse due to ______.
State the number of sets of chromosomes present in a zygote.
Explain the post fertilization changes that occur in the ovary of a flower.
