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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
In the following diagram showing the structure of embryo of a dicot seed, what are the parts marked I, II and III sequentially?
The reproductive part of a plant is the ______.
Where are the pollen grains produced?
Fill in the following blank with suitable word :
The male organ of reproduction in the flower is the.......... .
How is the process of pollination different from fertilization?
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
Give one example each of unisexual and bisexual flowers. Differentiate between the two types of pollination that occur in flowers. What happens when a pollen lands on a suitable stigma? Write about the events that occur till the seed formation in the ovary.
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
List any two differences between pollination and fertilization.
Draw a diagram of the longitudinal section of a flower and label the following parts.
Bisexual : Hibiscus : : Unisexual : ___________
Which type of development is observed in male gametophytes of plants?
Identify the female gametophyte in angiosperms.
Pollen grains are produced by ______
Which among the following statements are true for unisexual flowers?
- They possess both stamen and pistil
- They possess either stamen or pistil
- They exhibit cross pollination
- Unisexual flowers possessing only stamens cannot produce fruits
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.
Double fertilization is essential for formation of ______.
Triple fusion involves ______.
State the post-fertilisation changes that lead to fruit formation in plants.
