Changes in GnRH pulse frequency in females is controlled by circulating levels of
1. Estrogen and progesterone
2. Estrogen and inhibin
3. Progesterone only
4. Progesterone and inhibin
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The amnion of mammalian embryo is derived from
1. Mesoderm and trophoblast
2. Endoderm and mesoderm
3. Ectoderm and mesoderm
4. Ectoderm and endoderm
Hormones secreted by the placenta to maintain pregnancy are
1. hCG,hPL, progestogens, estrogens
2. hCG, hPL, estrogen, relaxin, oxytocin
3. hCG, hPL, progestogens, prolactin
4. hCG, progestogens, estrogens, glucocorticoids
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The difference between spermiogenesis and spermiation is:
1. | In spermiogenesis, spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation, spermatozoa are formed. |
2. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatids are formed. |
3. | In spermiogenesis, spermatids are formed, while in spermiation, spermatozoa are formed. |
4. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatozoa are released from sertoli cells into the cavity of seminiferous tubules. |
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I | Column II | ||
(a) | Proliferative Phase | (i) | Breakdown of the endometrial lining |
(b) | Secretory Phase | (ii) | Follicular Phase |
(c) | Menstruation | (iii) | Luteal Phase |
(a) | (b) | (c) | |
1. | (ii) | (iii) | (i) |
2. | (i) | (iii) | (ii) |
3. | (iii) | (ii) | (i) |
4. | (iii) | (i) | (ii) |
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For normal fertility, what percent of the sperm in ejaculate must exhibit vigorous motility?
1. | 20 | 2. | 30 |
3. | 40 | 4. | 60 |
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Transfer of sperms into the female genital tract is called:
1. | Insemination | 2. | Emission |
3. | Ejaculation | 4. | Spermiation |
Each seminiferous tubule is lined by male germ cells called:
1. | Spermatogonia | 2. | Primary spermatocytes |
3. | Sertoli cells | 4. | Leydig cells |
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FSH:
1. | Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis |
2. | Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis |
3. | Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis |
4. | Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis |
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Which cell in the sperm lineage undergoes reduction division [meiosis]?
1. | Type A spermatogonia | 2. | Type B spermatogonia |
3. | Primary spermatocyte | 4. | Secondary spermatocyte |
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