Receptors for sperm binding in mammals are present on:
1. | Perivitelline space | 2. | Zona pellucida |
3. | Corona Radiata | 4. | Vitelline membrane |
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?
1. Foetus
2. Uterus
3. Graafian follicle
4. Corpus luteum
Match the following columns and select the correct option:
Column I | Column II | ||
(a) | Ovary | (i) | Human chorionic gonadotropin |
(b) | Placenta | (ii) | Estrogen & Progesterone |
(c) | Corpus luteum | (iii) | Androgens |
(d) | Leydig cells | (iv) | Progesterone only |
Options: | (a) | (b) | (c) | (d) |
1. | (iv) | (iii) | (ii) | (i) |
2. | (i) | (ii) | (iii) | (iv) |
3. | (i) | (iii) | (ii) | (iv) |
4. | (ii) | (i) | (iv) | (iii) |
Select the correct option of haploid cells from the following groups :
1. | Primary oocyte, Secondary oocyte, Spermatid |
2. | Secondary spermatocyte, First polar body, Ovum |
3. | Spermatogonia, Primary spermatocyte, Spermatid |
4. | Primary spermatocyte, Secondary spermatocyte, Second polar body |
In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
1. Eyelids and eyelashes are formed
2. Most of the major organ systems are formed
3. The head is covered with fine hair
4. Movement of the fetus
Statement I: | The release of sperms from the seminiferous tubules is called spermiation. |
Statement II: | Spermiogenesis is the process of formation of sperms from spermatogonia. |
(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. |
1. (b), (c), and (e) only | 2. (c) and (e) only |
3. (b) and (c) only | 4. (b), (d) and (e) only |
How many Y-chromosomes are present in the 2nd polar body in human beings?
1. 01
2. 00
3. 23
4. 02
Which of the following hormones are secreted in women only during pregnancy?
(a) | Relaxin | (b) | Oxytocin |
(c) | hCG | (d) | hPL |
(e) | Progesterone |
Choose the most appropriate answer from the options given below:
1. (c), (d) and (e) only