Which of the following cells are diploid during gametogenesis?

Which type of cell division forms spermatids from the secondary spermatocytes?

Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis?
$(a)$ It results in the formation of haploid gametes
$(b)$ Differentiation of gamete occurs after the completion of meiosis
$(c)$ Meiosis occurs continuously in a mitotically dividing stem cell population
$(d)$ It is controlled by the Luteinising hormone $(LH)$ and Follicle-Stimulating Hormone $(FSH)$ secreted by the anterior pituitary
$(e)$ It is initiated at puberty
Choose the most appropriate answer from the options given below:

Massive amount of yolk present in the vegetal region of the egg makes an egg:

Secretion of progesterone by the corpus luteum is initiated by

Which hormone is responsible for ovulation and the development of the corpus luteum?