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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
Write the names of those parts of a flower which serve the same function as the following do in the animals :
(i) testis,
(ii) sperm,
(iii) ovary,
(iv) egg
How is the process of pollination different from fertilization?
The anther contains ______.
State the name of the functional unit concerned with sexual reproduction.
Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.
Give some examples of different modes of fertilisation in nature?
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?
In what ways is fertilisation in a plant similar to fertilisation in a human?
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
Write the names of male and female reproductive parts of a flower.
Identify the odd. Stigma, Style, Pollen, Ovary.
Sketch the labeled diagram:
Flower with its sexual reproductive organs
The anther wall consists of four wall layers where ______
Antipodal cells are present towards the ______ in an anatropous ovule.
Where is the zygote located in the flower after fertilization?
In a plant flower the female whorl is ______.
What is puberty?
