Reproduction — Set 2
Biology · प्रजनन · Questions 11–20 of 50
Which gland secretes a fluid that nourishes and protects sperm as part of semen?
Correct Answer: C. Prostate gland
The prostate gland contributes a slightly alkaline fluid to the semen to help sperm survive in the acidic female tract. It is located just below the urinary bladder in males. Semi-fluid secretions from the seminal vesicles are also essential for sperm motility.
The process by which the embryo attaches itself to the wall of the uterus is?
Correct Answer: B. Implantation
Implantation usually occurs about 6 to 10 days after fertilization. The blastocyst embeds itself into the thickened uterine lining called the endometrium. Successful implantation is necessary for a pregnancy to proceed.
How many chromosomes are present in a mature human sperm cell?
Correct Answer: D. 23
A human sperm cell is haploid, meaning it contains half the number of chromosomes found in body cells. When it fuses with a haploid egg (23 chromosomes), it restores the diploid number of 46. This ensures that the offspring has the correct genetic count.
Which of the following is the 'Master Gland' that controls the release of sex hormones?
Correct Answer: B. Pituitary
The pituitary gland secretes FSH and LH, which act directly on the gonads. These hormones regulate the production of estrogen and testosterone. It is located at the base of the brain.
The surgical removal or tying of the fallopian tubes to prevent pregnancy is called?
Correct Answer: C. Tubectomy
Tubectomy is a permanent method of contraception in females. It blocks the path of the egg, preventing it from meeting the sperm. The equivalent procedure in males is called a vasectomy.
Which hormone is known as the 'Birth Hormone' as it stimulates uterine contractions during labor?
Correct Answer: D. Oxytocin
Oxytocin is released by the posterior pituitary gland to initiate labor. It also plays a key role in the ejection of milk during breastfeeding. It is often referred to as the 'love hormone' due to its role in social bonding.
What is the fluid-filled sac that cushions and protects the fetus during pregnancy?
Correct Answer: D. Amniotic sac
The amniotic sac is filled with amniotic fluid that acts as a shock absorber. It also helps the fetus maintain a constant temperature. This sac usually ruptures at the start of labor, commonly known as 'water breaking'.
Which of the following describes the 'Acrosome' found in a sperm cell?
Correct Answer: D. The cap-like structure on the head
The correct answer is 'The cap-like structure on the head'. The acrosome contains enzymes that help the sperm penetrate the outer layers of the egg. Without these enzymes, fertilization cannot take place. It is derived from the Golgi apparatus during sperm development.
What is the primary role of Progesterone in the menstrual cycle?
Correct Answer: A. Maintaining the uterine lining
The correct answer is 'Maintaining the uterine lining'. Progesterone prepares and maintains the endometrium for the potential implantation of an embryo. If fertilization does not occur, progesterone levels drop, leading to menstruation. It is primarily produced by the corpus luteum in the ovary.
The first milk produced by the mother after childbirth, rich in antibodies, is called?
Correct Answer: A. Colostrum
Colostrum is high in protein and provides essential passive immunity to the newborn. It is produced only during the first few days after delivery. It is often yellowish in color and very thick.