Which of the following methods is used to prevent unwanted pregnancies in human beings?
Use of contraceptives
Pregnancy begins when a sperm fertilises an egg and the zygote implants in the uterus. Preventing unwanted pregnancy therefore needs a method that stops fertilisation or implantation.
Contraceptive methods do exactly this: barrier methods such as condoms stop sperm from reaching the egg, oral pills change hormone levels to prevent the release of eggs, devices like the copper-T prevent implantation, and surgical methods block the sperm or egg duct.
Vaccination protects against infectious diseases, while regular exercise and good nutrition keep the body healthy. None of these prevents fertilisation, so they cannot prevent pregnancy.
Hence, Use of contraceptives.
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Important Questions from Reproduction
Cells of the tapetum possess dense cytoplasm and generally have ________.
Human chorionic gonadotropin:
Zygotes do not undergo reduction division immediately. They produce a multicellular body called a -
Which of the following organisms does NOT show asexual reproduction by means of fission?
The pollen needs to be transferred from the stamen to the stigma. If this transfer of pollen occurs in the same flower, it is referred to as __________ . On the other hand, if the pollen is transferred from one flower to another, it is known as ______
