Class X Chapter 8 – How do Organisms Reproduce Science
• Variations are more viable in sexual mode than in asexual one. This is because in asexual reproduction, DNA has to function inside the inherited cellular apparatus.
Question 5: What are the functions performed by the testis in human beings? Answer: The testes are the male reproductive organs that are located outside the abdominal cavity within a pouch called scrotum. Functions of testes:
• Produce sperms
• Produce a hormone called testosterone, which brings about secondary sexual characters in boys.
Question 6: Why does menstruation occur? Answer: Menstruation is a process in which blood and mucous flows out every month through the vagina. This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus( womb) prepares itself to receive the fertilized egg. Thus, the inner lining of the uterus gets thickened and is supplied with blood to nourish the embryo. If the egg does not get fertilised, then the lining of the uterus breaks down slowly and gets released in the form of blood and mucous from the vagina. Question 7:
Draw a labelled diagram of the longitudinal section of a flower. Answer:
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