Give reasons for the following: (i) Why can a woman generally not conceive a child after 50 years of age? (ii) Polar bodies are formed during oogenesis and not during spermatogenesis.

Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.

TextMenstrual Cycle in Human FemalesDevelopment of Female Gametophyte in Flowering Plants

Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the question that follows :

CASE_STUDIESMenstrual Cycle in Human FemalesPregnancy and Placenta Formation in Humans

Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the questions that follows :

CASE_STUDIESMenstrual Cycle in Human FemalesPregnancy and Placenta Formation in Humans

Assertion (A) : Corpus luteum secretes the hormone, progesterone. Reason (R) : Hormone Progesterone is essential for maintenance of the endometrium.

Assertion-ReasonMenstrual Cycle in Human Females