Receptors for sperm binding in mammals are present on:
1. | Perivitelline space | 2. | Zona pellucida |
3. | Corona Radiata | 4. | Vitelline membrane |
Meiotic division of the secondary oocyte is completed:
1. At the time of copulation
2. After zygote formation
3. At the time of fusion of a sperm with an ovum
4. Prior to ovulation
Extrusion of the second polar body from the egg nucleus occurs:
1. | simultaneously with the first cleavage |
2. | after entry of sperm but before fertilization |
3. | after fertilization |
4. | before entry of sperm into the ovum |
Capacitation occurs in:
1. Epididymis
2. Vas deference
3. Female reproductive tract
4. Rete testis
1. | the ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the fallopian tube |
2. | the ovum and sperms are transported simultaneously to the ampullary-isthmic junction of the cervix |
3. | the sperms are transported into the cervix within 48 hrs of the release of the ovum in the uterus |
4. | the sperms are transported into the vagina just after the release of the ovum in the fallopian tube |
What happens during fertilisation in humans after many sperms reach close to the ovum?
1. | Only two sperms nearest the ovum penetrate zona pellucida |
2. | Secretions of acrosome help one sperm enter the cytoplasm of the ovum through zona pellucida |
3. | All sperms except the one nearest to the ovum lose their tails |
4. | Cells of corona radiata trap all the sperms except one |
Which one of the following is the most likely root cause of why menstruation is not taking place in regularly cycling human female?
1. | Fertilization of the ovum |
2. | Maintenance of the hypertrophical endometrial lining |
3. | Maintenance of high concentration of sex-hormones in the blood stream |
4. | Retention of well-developed corpus luteum |