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प्रश्न
Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?
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उत्तर
Mitosis is a cell division which results in the formation of two daughter cells from a cell with the same number of chromosomes. Zygote undergoes mitotic divisions to develop into an embryo which in turn, also undergoes mitotic divisions to become an adult. So, the constancy of chromosomes is maintained in these three stages.
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संबंधित प्रश्न
Name the male part of the flower.
Where are a plant's sex organs located?
What are the reproductive organs in a flower?
Fill in the following blank with suitable word :
The ovary of a flower becomes ....... after fertilisation.
Fill in the following blank with suitable word :
The term used to refer to the transfer of pollen from the stamen of one flower to the carpel of another flower of the same species is...........
How do the insects help in cross-pollination?
Explain the term 'fertilisation'.
What is seed? What are the parts of a seed? Explain with the help of a labelled diagram.
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Sketch the labeled diagram:
Flower with its sexual reproductive organs
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Calyx : Sepals : : Corolla : ________________
The anther wall consists of four wall layers where ______
Which type of development is observed in male gametophytes of plants?
State the number of sets of chromosomes present in a zygote.
What is the function of calyx?
Consider the following three flowers namely X, Y and Z. Which flower(s) would develop into a fruit?
| Flower X | Flower Y | Flower Z |
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