8. How do Organisms Reproduce Science class 10 in English Medium ncert book solutions 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.