Which one of the following is the most likely root cause why menstruation is not taking place in a regularly cycling human female?

  • A
    Maintenance of the hypertrophical endometrial lining
  • B
    Maintenance of high concentration of sex hormones in the blood stream
  • C
    Retention of well-developed corpus luteum
  • D
    Fertilization of the ovum

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In $ZIFT$,what is transferred into the fallopian tube?

Cleavage is a $\underline{A}$ which starts just after fertilization as the zygote moves through $\underline{B}$ of the oviduct towards the uterus.

Assertion : During fertilization,only the head of the spermatozoa enters the egg.
Reason : If several spermatozoa hit the egg at the same time,all can enter the egg.

Cleavage was first observed by

In determinate cleavage, the mitotic spindle is oriented in which direction relative to the animal-vegetal axis of the egg?

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