10th Class Science Solved Paper - Science-2017 Delhi Set-I

  • question_answer
    (a) Name the organ that produces sperms as well as secretes a hormone in human males. Name the hormone it secretes and write its functions.
    (b) Name the parts of the human female reproductive system where fertilisation occurs.
    (c) Explain how the developing embryo gets nourishment inside the mother's body.   


    (a) The organ that produces sperms as well as secreted male hormones is testis. The hormone secreted by it is testosterone.                 
    Its important functions are as follows:
    (i) It stimulates sperm production.
    (ii) It stimulates the development of secondary sexual characters in males like growth of facial hairs, low pitch voice, etc.
    (iii) It involves the development, maturation and functioning of male accessory sex organs like vas deferens and seminal vesicles.
    (b) In human females reproductive system, the process of fertilisation takes place in one of the fallopian tubes.
    (c) The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. Placenta is a vascular membranous organ that connects the developing foetus to the uterine wall of the mother. It contains villi on the embryo's side of the tissue. This provides a large surface area for glucose and oxygen to pass from mother to the embryo. The placenta draws nourishment and oxygen, which it supplies to the foetus, from the maternal circulation. In turn, the placenta receives carbon dioxide and wastes of fetal metabolism and discharges them into the maternal circulation for disposal.

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