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NCERT Solutions for Class 10th Science

 

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Chapter 8. How do Organisms Reproduce

Chapter Review

 

 

 

Chapter Review:


  • Full Form of DNA is Deoxyribo Nucleic Acid.
  • In fission, many bacteria and protozoa simply divide into two or more daughter cells.
  • Roots, stems and leaves of some plants develop into new plants through vegetative propagation.
  • Simple animals like Hydra and Planaria can be cut into any number of pieces and each piece grows into a complete organism. This is known as regeneration.
  • New plants are grown by removing tissue or separating cells from
    the growing tip of a plant is called Tissue culture.
  • Unisexual flowers may be papaya and watermelon.
  • The transfer of pollen grains from the stamen to the stigma in the same flower is called self pollination.
  • The transfer of pollen grains from the stamen to the stigma from one flower to another flower is called cross pollination.
  • The seed contains the future plant or embryo which develops into a seedling under appropriate conditions. This process is known as germination.
  • Sperm formation requires a lower temperature than the normal body
    temperature.
  • The two oviducts unite into an elastic bag-like structure known as the
    uterus.
  • Male sex hormone is testosterone.
  • Female sex hormone is estrogen.
  • The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood
    through the placenta.
  • The lining slowly breaks and comes out through the vagina as blood and mucous. This cycle takes place roughly every month and is known as menstruation.
  • The bacterial infections such as gonorrhoea and syphilis, and viral infections such as warts and HIV-AIDS.
  • Contraceptive devices such as the loop or the copper-T are placed in the uterus to prevent pregnancy.
  • The male reproductive system in human beings consists of testes which produce sperms, vas deferens, seminal vesicles, prostate gland, urethra and penis.
  • The female reproductive system in human beings consists of ovaries, fallopian tubes, uterus and vagina.

 

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