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प्रश्न
What are chromosomes?
उत्तर
Chromosomes are thread-like structures found in the nucleus at the time of cell division. They are made of proteins and DNA.
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संबंधित प्रश्न
Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
The figure given alongside shows the human male reproductive organs. Which structures make sperms and seminal fluid?
(a) V makes sperms and X makes seminal fluid
(b) W makes sperms and Y makes seminal fluid
(c) X makes sperms and W makes seminal fluid
(d) Y makes sperms and V makes seminal fluid
Multiple choice question. Tick (✓) the correct choice:
Butterfly in its development from larva to an adult shows
- multiplication
- metamorphosis
- fertilisation
- none of the above
Animals which give birth to young ones directly are named as ______.
What is parthenogenesis? Give two examples from animals
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
Differentiate between the following:
Regeneration in lizard and Planaria
Reproduction is essentially a phenomenon that is not for survival of an individual but for the stability of a species. Justify.
Between an annual and a perennial plant, which one has a shorter juvenile phase? Give one reason.
