Railway Science (Biology-Reproduction in Animals) (Part-III)

Total Questions: 50

21. What is the method called by which Copper T is placed in the uterus ? [RRB Group D 24/10/2018 (Afternoon)]

Correct Answer: (b) Contraception
Solution:

Contraception - It is known as a method of birth control. It is a method used to prevent pregnancy. Methods of contraception: Male and Female sterilization, Combined pill, Condoms, Contraceptive injection, Contraceptive patch, and Intrauterine device (Copper-T).

22. Which organ of the human body carries the egg from the ovary to the uterus ? [RRB Group D 24/10/2018 (Afternoon)]

Correct Answer: (b) Fallopian tube
Solution:

The Oviducts (fallopian tubes), Uterus and Vagina constitute the female accessory ducts. Each fallopian tube is about 10-12 cm long and extends from the periphery of each ovary to the uterus. Vas deferens - In males, it stores and transports the sperms from the testis to the outside through the urethra.

23. The sex of the children will be determined by what they inherit from the: [RRB Group D 25/10/2018 (Morning)]

Correct Answer: (b) father
Solution:

The sex of children is decided by the X or Y chromosome inherited from the father. A male has XY chromosomes and a female has XX chromosomes.

24. What is the straight tube, about 40 cm long, that carries sperms to the seminal vesicles, called ? [RRB Group D 29/10/2018 (Morning)]

Correct Answer: (c) Vas deferens
Solution:

Vas deferens (ductus deferens or a sperm duct) - Transports mature sperm to the urethra in preparation for ejaculation. Urethra - Tube that lets urine leave your bladder and your body.
Penis - An external male intromittent organ that additionally serves as the urinary duct. Scrotum - A part of a male's body that is located below the penis.

25. _______ divides into many daughter cells simultaneously by multiple fission. [RRB Group D 29/10/2018 (Evening)]

Correct Answer: (a) Plasmodium
Solution:

Plasmodium - Genus of parasitic protozoa that cause malaria in humans. Hydra - genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). Planaria - flatworms belonging to the phylum Platyhelminthes that have incredible regeneration ability.
Yeast (member of the fungus kingdom) - a single-cell organism which needs food, warmth, and moisture to thrive. Usages - baking and making alcoholic beverages.

26. Identify the part where the male reproductive tract produces the reproductive cells. [RRB Group D 30/10/2018 (Morning)]

Correct Answer: (d) testicles
Solution:

It is also known as testes, are two oval-shaped glands located within the scrotum. They play a crucial role in the male reproductive system by producing sperm cells (spermatogenesis) and the male sex hormone testosterone.

27. The fertilized egg, the zygote, becomes embedded in the layer of __________? [RRB Group D 30/10/2018 (Morning)]

Correct Answer: (d) uterus
Solution:

The oviduct is the fallopian tube, where fertilization usually occurs. The zygote spends about 3-5 days traveling down the fallopian tube to the uterus before implantation. The cervix is the opening of the uterus, acting like a gateway between the vagina and the uterus.

28. ________ gives birth to underdeveloped children. [RRB Group D 31/10/2018 (Morning)]

Correct Answer: (c) Kangaroo
Solution:

Kangaroos are known as marsupials. Marsupials are a group of mammals characterized by giving birth to underdeveloped young, which then continue to develop and nurse within a pouch called a marsupium. Examples of Marsupials include Wallabies, Koalas.

29. _______ brings about the changes in appearance seen in boys at the time of puberty. [RRB Group D 31/10/2018 (Afternoon)]

Correct Answer: (b) Testosterone
Solution:

Testosterone: This hormone responsible for the growth of a beard, the voice becoming hoarse, development of reproductive organs, etc in male. Prolactin regulates the growth of the mammary glands and formation of milk in them. Oestrogen - stimulates growth and development of female accessory sex organs and secondary sex characters.

30. The sperms are temporarily stored in the _____. [RRB Group D 4/12/2018 (Afternoon)]

Correct Answer: (b) epididymis
Solution:

The epididymis is the male sex accessory duct. The main function of the epididymis is to store the sperms for maturation and transport it to vas deferens.