Biology (NTSE/Olympiad)  

6. Reproduction

Sexual Reproduction

Sexual Reproduction
Sexual reproduction is a mode of multiplication in which the young ones are produced through the process of formation & fusion of gametes.
Significance of sexual reproduction :
Variation :
Due to reshuffling of chromosomes and crossing over, sexual reproduction brings about variations in almost all characters so that no two individuals are similar.
Vigour and Vitality :
It maintains the vigour and vitality of the individuals.
Uniformity of Population :
Due to the flow of genes amongst individuals during sexual reproduction, the uniformity of population is maintained where there is a broad resemblance of all the individuals with one another.
Evolution :
Genetic changes brought about by sexual reproduction paly an important part in evolution of new forms.
Sexual reproduction in flowering plants :
A flower has following parts.

Sepals :
Sepals are green outermost leaf-like floral organs which protect the flower in the bud stage. In the mature stage they provide support to other floral organs.


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