Homework for Autumn Break

Class X A, B, C
  1. Complete notes of chapter "How do organisms reproduce? "- Asexual reproduction, General features of sexual reproduction.
  2. Do NCERT questions based on topics covered so far.

Class XA - Submit your report on dengue emphasising on how it affects our health (body functions affected) and suggesting measures as to how you can prevent its spread by ensuring cleanliness in your surroundings. Establish the relationship between environmental phenomenon of global warming and increase in the population of vector (e.g. mosquito). Also submit your poster to spread awareness about dengue.


HAPPY DUSSEHRA ! Enjoy the holidays and at the same time study for your upcoming Unit test..

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Notes of How do organisma reproduce? ( Sexual reproduction in Plants and humans)

Sexual Reproduction When reproduction takes place as a result of fusion of two gametes, one from each parent, it is called sexual reproduction The process of fusion of male and female gametes is called fertilization . ˜ The formation of gametes involves exchange of chromosomal (genetic) fragments between homologous chromosomes causing genetic recombination which leads to variation . Gametes : Special Reproductive cells are different from normal cells as they have half              the  number of chromosomes. e.g Human cells have 46 chromosomes but sperm and egg have 46/2=23 chromosomes. So when sperm and egg fuse, zygote will have 23+23= 46 chromosome. Male gamete : small in size and motile (has tail) Female gamete: big in size ( because of stored food reserve) and non motile. Sexual Reproduction in Plants It occurs mostly in flowering plants. In fact flowers are the reproductive organ of plants. FLOWERS ...
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