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The figure shows a section of human ovary. Select the option which gives the correct identification of either $A$ or $B$ with function/ characteristic.
$B$ - Corpus luteum - Secretes progesterone
$A$ - Tertiary follicle - Forms Graafian follicle
$B$ - Corpus luteum - Secretes estrogen
$A$ - Primary oocyte - It is in the prophase $I$ of the meiotic division
Solution
(a) : The zona granulosa and theca cells of Graafian follicle remaining in the ovary after ovulation and some surrounding capillaries and connective tissue evolve into the corpus luteum (a temporary endocrine gland). The corpus luteum produces progesterone and, in the event of fertilization, provides the required progesterone until the placenta is formed. In the absence of fertilization, the life span of the corpus luteum is $14$ days. It then degenerates into a corpus albicans, which is mainly a scar tissue.
