- AOvarieetomy.
- BHysterectomy.
- CVasectomy.
- DCastration.
Ovariectomy is removal of ovary which is carried out in case of ovarian cyst or cancer. Hysterectomy is removal or uterus which is carried out in case of uterine cancer or risk of uterine cancer. Castration is done in males (usually in animals).
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$I.$ In microinjection method foreign $DNA$ is directly injected into the nucleus of animal cell or plant cell by using micro needles or micro pipettes
$II.$ Microinjection method is used in oocytes, eggs and embryo
$III.$ Electroporation is the formation of temporary pores in the plasma membrane of host cell by using lysozyme or calcium chloride
$IV.$ In chemical mediated gene transfer method certain chemicals such as $\mathrm{CO}_{2}$ help foreign $DNA$ to enter the host cell
Which of the statements given above are correct?