NCERT Biology Human Reproduction <
Secretions from which one of the following are rich in fructose, calcium and some enzymes?
(A) Male accessory glands
(D) Salivary glands
In human female, the blastocyst
(A) Forms placenta even before implantation
(B) Gets implanted into uterus 3 days after ovulation
(C) Gets nutrition from uterine endometrial secretion only after implantation
(D) Gets implanted in endometrium by the trophoblast cells
Seminal plasma in human males is rich in:
(A) Fructose and calcium
(B) Glucose and calcium
(C) DNA and testosterone
(D) Ribose and potassium
Sertoli cells are found in
(A) Ovaries and secrete progesterone
(B) Adrenal cortex and secrete adrenalin
(C) Seminiferous tubules and provide nutrition to germ cells
(D) Pancreas and secrete cholecystokinin
Vasa efferentia are the ductules leading from:
(A) Testicular lobules to rete testis
(B) Rete testis to vas deferens
(C) Vas deferens to epididymis
(D) Epididymis to urethra
The signals for parturition originate from:
(A) Placenta only
(B) Placenta as well as fully developed foetus
(C) Oxytocin released from maternal pituitary
(D) Fully developed foetus only
The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
(A) Fourth month
(B) Fifth month
(C) Sixth month
(D) Third month
The second maturation division of the mammalian ovum occurs
(A) Shortly after ovulation before the ovum makes entry into the Fallopian tube
(B) Until after the ovum has been penetrated by a sperm
(C) Until the nucleus of the sperm has fused with that of the ovum
(D) In the Graafian follicle following the first maturation division
Which one of the following statements about human sperm is correct?
(A) Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilization
(B) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilization
(C) Acrosome serves as a sensory structure leading the sperm towards the ovum
(D) Acrosome serves no particular function
Which one of the following statements about morula in humans is correct?
(A) It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
(B) It has far less cytoplasm as well as less DNA than in an uncleaved zygote
(C) It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
(D) It has more cytoplasm and more DNA than an uncleaved zygote
The part of fallopian tube closest to the ovary is
The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for:
(A) Escaping any possible compression by the visceral organs
(B) Providing more space for the growth of epididymis
(C) Providing a secondary sexual feature for exhibiting the male sex
(D) Maintaining the scrotal temperature lower than the internal body temperature
What happens during fertilization in humans after many sperms reach close to the ovum?
(A) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
(B) All sperms except the one nearest to the ovum lose their tails
(C) Cells of corona radiata trap all the sperms except one
(D) Only two sperms nearest the ovum penetrate zona pellucida
About which day in a normal human menstrual cycle does rapid secretion of LH(popularly called LH surge) normally occurs?
(A) 14th day
(B) 20th day
(C) 5th day
(D) 11th day
The secretory phase in the human menstrual cycle is also called:
(A) Follicular phase lasting for about 6 days
(B) Luteal phase and lasts for about 13 days
(C) Follicular phase and lasts for about 13 days
(D) Luteal phase and lasts for about 6 days
Which one of the following statements is false in respect of viability of mammalian sperm?
(A) Sperm is viable for only up to 24 hours
(B) Survival of sperm depends on the pH of the medium and is more active in alkaline medium
(C) Viability of sperm is determined by its motility
(D) Sperms must be concentrated in a thick suspension
Signals for parturition originate from:
(A) Both placenta as well as fully developed foetus
(B) Oxytocin released from maternal pituitary
(C) Placenta only
(D) Fully developed foetus only
In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was.
(A) High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo.
(B) High level of circulating HCG to stimulate endometrial thickening.
(C) High level of FSH and LH in uterus to stimulate endometrial thickening
(D) High level of circulating HCG to stimulate estrogen and progesterone synthesis.
What is the correct sequence of sperm formation?
(A) Spermatid, spermatocyte, spermatogonia, spermatozoa
(B) Spermatogonia, spermatocyte, spermatozoa
(C) Spermatogonia, spermatozoa, spematocyte
(D) Spermatogonia, spermatocyte, spermatid, spermatozoa
Menstrual flow occurs due to lack of:
Which one of the following is not the function of placenta? It:
(A) Facilitates supply of oxygen and nutrients to embryo
(B) Secretes estrogen
(C) Facilitates removal of carbon dioxide and waste material from embryo.
(D) Secretes oxytocin during parturition
The shared terminal duct of the reproductive and urinary system in the human male is:
(C) Vas deferens
(D) Vasa efferentia
The main function of mammalian corpus luteum is to produce:
(A) Estrogen only
(C) Human chorionic gonadotropin
(D) Relaxin only
Select the correct option describing gonadotropin activity in a normal pregnant female:
(A) High level of FSH and LH stimulates the thickening of endometrium
(B) High level of FSH and LH facilitate implantation of the embryo
(C) High level of hCG stimulates the synthesis of estrogen and progesterone
(D) High level of hCG stimulates the thickening of endometrium
Capacitation refers to changes in the :
(A) Sperm before fertilization
(B) Ovum before fertilization
(C) Ovum after fertilization
(D) Sperm after fertilization
Which of these is not an important component of initiation of parturition in humans?
(A) Increase in estrogen and progesterone ratio
(B) Synthesis of prostaglandins
(C) Release of oxytocin
(D) Release of prolactin
Which of the following cells during gameto- genesis is normally diploid?
(A) Primary polar body
(D) Secondary polar body
Hysterectomy is surgical removal of:
(B) Prostate gland
(D) Mammary glands
Which of the following events is not associated with ovulation in human female?
(A) Full development of Graafian follicle
(B) Release of secondary oocyte
(C) LH surage
(D) Decrease in estradiol
Ectopic pregnancies are referred to as:
(A) Implantation of embryo sat side other than uterus
(B) Implantation of defective embryo hi the uterus
(C) Pregnancies terminated due to hormonal imbalance
(D) Pregnancies with genetic abnormality
Which of the following layers in an antral follicle is acellular?
(A) Theca interna
(C) Zona pellucida
In human female, meiosis-II is not completed until?
(B) Uterine implanation