Colostrum, the yellowish fluid, secreted by mother
during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains:
Which of the following structures is not a part of the male reproductive system?
The infundibulum is the funnel-shaped part of the female oviduct. Rete testis, epididymis and vasa efferentia are parts of the male reproductive system.
Statement I: Ovulation is caused by an LH surge leading to rupture of the Graafian follicle.
Statement II: The Graafian follicle remaining after ovulation transforms into the corpus luteum and secretes a large amount of estrogen.
In the light of the above statements, choose the most appropriate answer from the options given below:
The LH surge induces rupture of the Graafian follicle and ovulation. The remaining follicular tissue forms the corpus luteum, which primarily secretes a large amount of progesterone.
Match List-I with List-II related to embryonic development at various months of pregnancy:
List-I
List-II
A. The foetus movement starts and hair appears on the head
I. 24 weeks of pregnancy
B. The foetus develops limbs and digits
II. 20 weeks of pregnancy
C. The foetus develops external genital organs
III. 8 weeks of pregnancy
D. The foetus body is covered with fine hair; eyelids separate and eyelashes are formed
IV. 12 weeks of pregnancy
At 8 weeks limbs and digits appear, at 12 weeks external genitalia develop, at 20 weeks foetal movement and scalp hair appear, and by 24 weeks the body is covered with fine hair and eyelashes develop.
Spermatogonia undergo a series of cell divisions to produce sperms. Select the correct statements from the following:
(A) Spermatogonia always undergo meiotic cell division.
(B) Primary spermatocytes divide mitotically to produce secondary spermatocytes.
(C) Secondary spermatocytes, through their second meiotic division, produce haploid spermatids.
(D) Spermatids produce spermatozoa through mitosis.
(E) Spermatids transform into spermatozoa by spermiogenesis.
Choose the correct answer from the options given below:
Spermatogonia divide mitotically. Primary spermatocytes undergo meiosis I to form secondary spermatocytes. Secondary spermatocytes undergo meiosis II to produce spermatids, which transform into spermatozoa by spermiogenesis.
