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Q.21. In spermatogenesis, reduction division of chromosome occurs during conversion of
- spermatogonia to primary spermatocytes
- primary spermatocytes to secondary spermatocytes
- secondary spermatocytes to spermatids
- spermatids to sperms
Answer:
(b) primary spermatocytes to secondary spermatocytes
Explanation: It occurs during conversion of primary spermatocytes to secondary spermatocytes
Explanation: It occurs during conversion of primary spermatocytes to secondary spermatocytes
Human Reproduction - Biology Revision Test (Class 12th) | MCQs For NEET
25 Questions 19 Attempts 4.08K Seen
This practice test includes Biology (Class 12th ) 25 important questions from the chapter human reproduction. Start Test without Login in
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Action | Q.No. | Que title | Option 1 (a) | Option 2 (b) | Option 3 (c) | Option 4 (d) |
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1 | Ovulation in the human female normally takes place during the menstrual cycle | at the mind secretory phase | just before the end of the secretory phase | at the beginning of the proliferative phase | at the end of the proliferative phase | |
2 | After ovulation Graafian follicle regreses into | corpus atresia | corpus callosum | corpus luteum | corpus albicans | |
3 | Immediately after ovulation, the mammalian egg is covered by a membrane known as | chorion | zona pellucida | corona radiata | vitelline membrane. | |
4 | Which one of the following events is correctly matched with the time period in a normal menstrual cycle ? | Release of egg : 5 th day | Endometrium regenerates : 5 – 10 days | Endometrium secretes nutrients for implantation: 11 – 18 days | Rise in progesterone level : 1 – 15 days | |
5 | If mammalian ovum fails to get fertilised, which one of the following is unlikely ? | Corpus luteum will distintegrate. | Progesterone secretion rapidly declines. | Estrogen secretion increases. | Primary follicle starts developing | |
6 | A human female reaches menopause aroung the age of__ yrs | 50 | 15 | 70 | 25 | |
7 | A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is | acrosomal reaction | cortical reaction | acrosin reaction | bindin reaction | |
8 | Which part of the sperm plays an important role in penetrating the egg membrane ? | Allosome | Tail | Autosome | Acrosome | |
9 | In oocyte secondary maturation occurs in | ovary | abdominal cavity | Fallopian tube | uterus. | |
10 | Besides activating the egg another role of a sperm is to carry to egg | RNA | mitochondria | DNA | ribosomes | |
11 | Preparation of sperm before penetration of ovum is | spermiation | cortical reaction | spermiogenesis | capacitation | |
12 | The function of the secretion of prostate gland is to | inhibit sperm activity | attract sperms | stimulate sperm activity | none of these. | |
13 | Lower narrow end of uterus is called | urethra | cervix | clitoris | vulva | |
14 | Bartholin’s glands are situated | on the either side of vagina in humans | on either side of vas deferens in humans | on either side of penis in humans | on either side of Fallopian tube in humans | |
15 | In human adult females oxytocin | stimulates pituitary to secrete vasopressin | causes strong uterine contractions during parturition | is secreted by anterior pituitary | stimulates growth of mammary glands | |
16 | The third stage of parturition is called “after-birth”. In this stage | excessive bleeding occurs | fetus is bom and cervix and vagina contraction to normal condition happens | fetus is bom and contraction of uterine wall prevents excessive bleeding | placenta is expelled out | |
17 | spot the odd one out from the following structures with reference to the male reproductive system | Rate testis | Epididymis | Vasa efferentia | Isthmus | |
18 | In humans, at the end of the first meiotic division, the male germ cells differentiate into the | spermatids | spermatogonia | primary spermatocytes | secondary spermatocytes | |
19 | How many sperms are formed from a secondary spermatocyte ? | 4 | 8 | 2 | 1 | |
20 | How many sperms are formed from 4 primary spermatocytes ? | 4 | 1 | 16 | 32 | |
21 | In spermatogenesis, reduction division of chromosome occurs during conversion of | spermatogonia to primary spermatocytes | primary spermatocytes to secondary spermatocytes | secondary spermatocytes to spermatids | spermatids to sperms | |
22 | Which of the following groups of cells in the male gonad, represent haploid cells ? | Spermatogonial cells | Germinal epithelial cells | Secondary spermatocytes | Primary spermatocytes | |
23 | The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called | spermiogenesis | spermatogenesis | spermatocytogenesis | spermiation | |
24 | Acrosome is a type of | lysosome | flagellum | ribosome | basal body | |
25 | At what stage of life is oogenesis initiated in a human female ? | At puberty | During menarch | During menopause | During embryonic development |
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