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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
State significance of pollination.
Explain what you understand by sexual reproduction.
State the name of the functional unit concerned with sexual reproduction.
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...........
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
What changes take place in the flower after fertilisation which lead to the formation of seeds and fruit?
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
Which of the following is not an unisexual flower?
a) Coconut
b) Papaya
c) Gulmohor
d) Maize
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
__________ is present in unisexual flower.
Calyx : Sepals : : Corolla : ________________
Bisexual : Hibiscus : : Unisexual : ___________
Define.
Inflorescence
The male reproductive part of a flower is ______.
Write the events involved in the sexual reproduction of a flowering plant.
a. Discuss the first event and write the types.
b. Mention the advantages and the disadvantages of that event.
The ovule of an angiosperm is technically equivalent to ______
In human beings, fertilization occurs in the ______
Give any two examples of agents of pollination.
Explain the post fertilization changes that occur in the ovary of a flower.
