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Is the chromosome number of zygote, embr...

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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Yes, the chromosome number of zygote, embryonal cell, and adult of a particular organism is always constant. This constancy is maintained as the cells in all the three stages undergo only mitotic divisions (non-reductional division).
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OSWAL PUBLICATION-REPRODUCTION-NCERT EXEMPLAR (SHORT ANSWER QUESTIONS)
  1. In tobacco plant, the male gametes have twenty four chromosomes. What ...

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  2. Why cannot fertilisation take place in flowers if pollination does not...

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  3. Is the chromosome number of zygote, embryonal cells and adult of a par...

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  4. Where is the zygote located in the flower after fertilisation?

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  5. Reproduction is linked to stability of population of a species. Justif...

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  6. How are general growth and sexual maturation different from each other...

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  7. Trace the path of sperm during ejaculation and mention the gland and t...

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  8. What changes are observed in the uterus if fertilisation does not occu...

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  9. What changes are observed in the uterus subsequent to implantation of ...

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  10. What are the benefits of using mechanical barriers during sexual act?

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  11. In the given figure label the parts and mention their functions (a)P...

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  12. What would be the ratio of chromosome number between an egg and its zy...

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  13. Why are budding, fragmentation and regeneration all considered as asex...

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  14. Write two points of difference between asexual and sexual types of rep...

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  15. Distinguish between pollination and fertilisation. Mention the site an...

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  16. Distinguish between a gamete and zygote. Explain their roles in sexual...

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  17. Draw the diagram of a flower and label the four whorls. Write the name...

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  18. What is placenta? Mention its role during pregnancy?

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  19. What are various ways to avoid pregnancy? Elaborate any one method.

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  20. How does fertilisation take place? Fertilisation occurs once in a mont...

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