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STD 12 - 2. human reproduction — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 2. human reproduction1 Mark
MCQ
Implantation is
  • ✓
    Attachment of blastocyst to uterine wall
  • B
    Division of blastocyst
  • C
    Formation of organs
  • D
    An IVF technique
✓

Answer

Correct option: A.
Attachment of blastocyst to uterine wall
a
Implantation is the attachment of blastocytes to the uterine wall. Gametes. The major reproductive events in human beings are as follows$(i)$ Gametogenesis It is the formation of gametes. It includes spermatogenesis (formation of sperms) and oogenesis (formation of ova/eggs)$(ii)$ Insemination It is the transfer of sperms by the male into the genital tract of the female$(iii)$ Fertilization Fusion of male and female gametes to form zygote is called fertilization$(iii)$ Fertilization Fusion of male and female gametes to form zygote is called fertilization$(iv)$ Cleavage It is rapid mitotic divisions of the zygote which convert the single celled zygote into a multicellular structure called blastocyst (blastula)$(v)$ Implantation It is the attachment of blastocyst to the uterine wall$(vi)$ Placentation It involves the formation of placenta which is the intimate connection between the foetus and uterine wall of the mother to exchange the materials$(vii)$ Gastrulation It is the process by which blastocyst is changed into gastrula with three primary germ layers$(viii)$ Organogenesis It is the formation of specific tissue, organs and organ systems from three primary germ layers$(ix)$ Parturition (child birth) it involves expelling of the baby from the mother's womb (uterus)

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