Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Spermatogenesis takes place in
Refer NCERT, Heading 22.2.9 Para 1 page 338, It takes place in Seminiferous tubule
Which of the following is not true about testosterone
Refer NCERT, Heading 22.2.9 Para 2 page 338
Which of the following is true about testosterone
Refer NCERT, Heading 22.2.9 Para 1 page 338
Which of the following is an ovarian hormone
Inhibin: One of two hormones (designated inhibin-A and inhibin-B) secreted by the gonads (by Sertoli cells in the male and the granulosa cells in the female) and that inhibit the production of follicle-stimulating hormone (FSH) by the pituitary gland.
Which of the following hormone is called pregnancy hormone
Refer NCERT, Heading 22.2.10 Para 1 page 338
Which of the following is true about progesterone
Refer NCERT, Heading 22.2.10 Para 2 page 339
Which of the following is true about estrogen
Refer NCERT, Heading 22.2.10 Para 1 page 338
Withdrawal of which of the following hormones is the immediate cause of menstruation ?
Menstruation is caused by the reduction of estrogen and progesterone, especially progesterone at the end of monthly ovarian cycle. The first effect is decreased stimulation of the endometrial cells by these two hormones followed rapidly by involution of the endometrium itself to : about 65% of its previous thickness.
Low levels of LH during the secretory phase of the menstrual cycle are primarily due to
(d) At the onset of the luteal phase, plasma gonadotropins decrease and plasma progesterone increases. A secondary rise in estrogens causes further gonadotropin suppression. Near the end of the luteal phase, progesterone and estrogen level falls, and FSH levels begin to rise to initiate the development of the next follicle.
Which of the following is true regarding sperm?
(b) Hyaluronidase is a hydrolytic enzyme present in the acrosome of sperm (human testes). It lysis the glycosaminoglycans in the extracellular matrix holding the cell of the corona radiata together. As the coronal cells become more loosely associated, sperm cells can propel themselves inward, toward the zona pellucida by making a receptive cone or fertilization cone through the cytoplasm of the egg. Hyaluronidase may also be involved in breaking down the Zona Pellucida. Fertilizin is a chemical substance secreted from the cortical region of egg cytoplasm to attract the sperm towards the egg. Acrosin is released from the acrosome of a spermatozoa as a consequence of the acrosome reaction. It aids in the penetration of Zona Pellucida. Capacitation is the final stage in the maturation process of spermatozoa. This takes place inside the genital tract as the sperm penetrates the ovum.
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