NEET Biology Human Reproduction MCQs Set 11

Answer: (c) Sertoli’s cell

Explanation:
1. Sertoli’s cell provide nutrition to the sperm in testes.

Answer: (a) Oestrogen and progesterone

Explanation:
1. Saheli is the oral contraceptive contained oestrogen and progesterone

Answer: (d) All of theses

Explanation:
1. Gastrulation is the process of the formationof gastrula from the blastula. It is characterized y formation of three primary germ layers and morphogenetic movements including epiboly, emboly, involution, invagination and delamination.

Answer: (a) Female genital tract

Explanation:
1. Capacitation is the activation of sperm in mammals, which takes place in female genital duct. The secretory cells of epithelial lining of oviduct mucosa secrete viscous fluid, which activates the sperms due to which sperms get motile for fusion with egg.

Answer: (c) Seminal vesicles

Explanation:
1. Seminal vesicles secrete and alkaline, nutritive, spermatozoa activating fluid called seminal fluid which forms about 60% part of semen. This fluid contains various substances like fructose, citrate, inositol, prostaglandins and several proteins. Sperms use fructose as an energy source (respiratory substrate).

Answer: (d) Oestrogen

Explanation:
1. Oestrogen hormone is screted by growing ovarian follicles during menstrual cycle. It provokes a thickening of the endometrium (proliferative phase or menstrual cycle).

Answer: (d) All of the above

Explanation:
1. Placenta is the intimate connection between foetus and uterine wall of the mother to exchange material. Placenta performs (i) Nutrition (ii) Respiration (iii) Excretion (iv) Storage (v) Endocrine part of embryo

Answer: (d) All of the above

Explanation:
1. The outer surface of the chorion in humans develops a number of finger-like projection called chorionic villi. Because the chorion takes part in the formation of placenta, the human placenta is chorionic placenta. Amount of yolk is very less and found in yolk sac of foetal membranes of humans

Answer: (a) Leydig cells

Explanation:
1. Differences between Leydig’s cells and Sertoli cells

Answer: (a) Slow and synchronous

Explanation:
1. Cleavage in human is simple holoblastic slow and synchronous. Cleavage in mammals ovum takes place during its passage through the fallopian tube to the uterus. The resultant cells of cleavage are called blastomeres.

Answer: (d) I and II

Explanation:
1. Testosteron is a steroid hormone and causes development of secondary sexual characters in male.
2. Gestation period of rabbit is approximately 28 to 32 days.
3. Bulbourethral glands are the pea-sized glands inferior to the prostate. These glands secrete a fluid that lubricates urethra and the end of penis.
4. Before ovulation, oestrogens are secreted from Graafian follicle. Placenta also secretes some amount of oestrogens.

Answer: (d) A-sexually, B-viviparous, C-internal, D- haploid, E- diploid, F-ovulation, G-LH, H-fertilisation, I-blastocyst, J-placenta

Explanation:
1. A-Sexually, B-Viviparous, C-Internal, D-Haploid, E-Diploid, F-Ovulation, G-LH, H-Fertilisation, I-Blastocyst, J-Placenta

Answer: (a) Graafian follicle

Explanation:
1. A tertiary follicle changes into the mature follicle or Graafian follicle. The secondary oocyte forms a new membrane called zona pellucida surrounding it. The Graafian follicle ruptures to release the secondary oocyte (ovum) from the ovary by the process called ovulation

Answer: (a) Foetal ejection reflex

Explanation:
1. Foetal ejection reflex

Answer: (b) Labium minora, labium majora, clitoris

Explanation:
1. The external genitals of female are collectively called vulva. These include the protective coverings of skin folds called labia majora and labia minora. Clitoris is another accessory external reproductive organ of female. Labia majora and labia minora protect the vaginal and urethral openings beneath, while clitoris provides felling of pleasure during sexual stimulation.

Answer: (a) A-fertilisin, B-glycoprotein, C-antifertilisin, D-protein, E-agglutination

Explanation:
1. Fertilisin antifertilisin interaction was proposed by IR Lillie. According to this theory, ovum secretes fertilisin (composed of glycoprotein = monosaccharide + Amino acid) and sperm release antifertilisin (composed of acidic amino acid). They interact with each other and they are species specific. The adhesion of sperm to the egg of the same species through chemical recognition is known as agglutination

Answer: (d) Hyaluronidase

Explanation:
1. Hyaluronidaseenzyme facilitates the entry of spermatozoa.

Answer: (a) Conversion of spermatids to sperm

Explanation:
1. The transformation of spermatids to sperm is known as spermiogenesis or spermateleosis.

Answer: (d) At the end of the proliferative phase

Explanation:
1. Ovulation takes place under the influence of LH and FSH. It normally takes place at the end of proliferative phase, i.e, 14^th day or mid way during menstrual cycle.

Answer: (a) Telolecithal

Explanation:
1. Frog is in amphibian, which possesses telolecithal eggs. In telolecithal eggs, the amount of yolk is concentrated in the one half of the egg to form the vegetative pole of the egg and thus makes polarity along the axis of yolk distriution.

Answer: (c) Testis

Explanation:
1. Differences between primary and secondary sex organs

Answer: (d) Secondary or Graafian

Explanation:
1. Antrum is the fluid filled cavity which is formed only in secondary follicle or Graafian follicle

Answer: (a) Insemination

Explanation:
1. Fertilization
2. The process of fusion of a sperm (male gamete) with an ovum (female gamete) is called fertilization
3. Steps
4. (i) During coitus, semen is released by the penis into the vagina (insemination)
5. (ii) The motile sperms swim rapidly through the cervix, enter into the uterus and reach the ampullary isthmic junction of the oviduct (site of fertilization)
6. (iii) A sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane to block the entry of additional sperms
7. (iv) The enzymes of the acrosome of sperm help to dissolve zona pellucida and plasma membrane of the ovum and sperm head is allowed to enter into the cytoplasm of the ovum, i.e., secondary oocyte
8. (v) Ultimately diploid zygote is produced by the fusion of a sperm and an ovum

Answer: (c) Head region of sperm

Explanation:
1. Sperm lysin is found in head region of sperm
2. Acrosome contains hyaluronidase proteolytic enzymes, which is popularly known as sperm lysin as it is used to penetrate egg (ovum) at the time of fertilisaton

Answer: (d) Caput epididymis

Explanation:
1. In rabbit head of epididymis present at the head of the testis is called caput epidiymis.