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Receptors for sperm binding in mammals are present on: (2021)
Sperm plasma membrane receptors bind to ZP3 on the zona pellucida. Binding to ZP3 allows sperm to adhere to the zona pellucida, which is an important step in fertilisation.
The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.
Fig: Sperm binding receptors
Which of the following secretes the hormone, relaxin, during the later phase of pregnancy? (2021)
Relaxin is produced first by the corpus luteum of the ovary and later by the placenta. It helps in parturition as it increases the flexibility of the pubic symphysis and helps dilate the uterine cervix.
Which of the following hormone levels will cause release of ovum (ovulation) from the graafian follicle? (2020)
LH (Luteinizing hormone) is produced by the pituitary gland in the brain. It triggers ovulation & promotes the development of the corpus luteum by rupture of the Graafian follicle and high concentration of estrogen is released by mature Graafian follicle. The egg ruptures the ovary wall and heads into the fallopian tubes where it waits for the sperm.
The amnion of mammalian embryo is derived from (2018)
Capacitation occurs in (2017)
The fluid which is rich in calcium fibrinolysin and acid phosphatase and contributes about 30% of the total volume of semen, is released by 
During pregnancy, which of the following is secreted through the urine of the mother? 
It is made almost exclusively in the placenta. HCG hormone levels found in the mother's blood and urine rise a lot during the first trimester. They may play a part in the nausea and vomiting often linked to pregnancy.
Select the incorrect statement : 
In follicular phase of menstrual cycle, LH and FSH increase gradually and stimulate follicular development as well as secretion of estrogens by the growing follicles.
Fertilization in humans is practically feasible only if: 
Capacitation refers to changes in the: [2015 RS]
Which of these is not an important component of initiation of parturition in humans ? [2015 RS]
Which of the following cells during gametogenesis is normally diploid? [2015 RS]
During gametogenesis, spermatogonia are diploid because of undergoing the process of meiosis.
Which of the following events is not associated with ovulation in human female? [2015 RS]
A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is: [2015 RS]
Gamete intra fallopian transfer:
Which of the following layers in an Antral follicle is acellular ? [2015 RS]
The shared terminal duct of the reproductive and urinary system in the human male is: 
Urethra is a tube that connects the urinary bladder to the genitals for the removal of fluids from the body. The urethra travels through the penis and carries semen as well as urine.
The main function of mammalian corpus luteum is to produce: 
The corpus luteum is a temporary endocrine structure in female mammals that is involved in the production of relatively high levels of progesterone.
Select the correct option describing gonadotropin activity in a normal pregnant female: 
Synthesis of estrogen and progesterone due to high level of hCG is a normal gonadotropic activity in a normal pregnant female.
Atretic follicles are found in the 
Both corpus luteum and macula lutea are:
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