Biology (Part-VIII) (Railway)

Total Questions: 50

21. The uterine wall in females prepares itself to receive the developing fertilised egg. In case there is no fertilisation. the thickened linning of the uterine wall breaks down and goes out of the body along with blood. This is called. [RRB Group 'D' CBT Exam, 29.09.2022 (Shift-III)]

(1) menopause
(2) menstruation
(3) Secondary sexual characters
(4) Adam's apple

Correct Answer: (2) menstruation

Solution:The uterine wall in female prepares itself to receive the developing fertilized eggs.

• In case there is no fertilization, the thickened lining of the uterus wall breaks down and goes out of the body along with the blood.

• This is called menstruation.

22. Where can we find the glomerulus in a human being? [RRB Group 'D' CBT Exam, 29.09.2022 (Shift-III)]

(1) In the bone marrow
(2) In the uterus
(3) In the liver
(4) In the kidney

Correct Answer: (4) In the kidney

Solution:A tuft of small blood veins (capillaries) found at the beginning of a nephron in the kidney is known as a glomerulus (plural glomeruli).

• There are around one million nephrons in each of the two kidneys.

• The mesangium (the space between the blood vessels). which is made up of intraglomerular mesangial cells, supports the tuft structurally.

23. How does a loop act as a contraceptive? [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) It blocks the release of sperm
(2) It inhibits release of ovum
(3) It inhibits implantation of the embryo
(4) It blocks access to the fallopian tubes.

Correct Answer: (4) It blocks access to the fallopian tubes.

Solution:A loop (IUD, Intra Uterine Device) is a small coil like birth control device, which is inserted into a woman's uterus to prevent implantation.

• It is an effective method of birth control as it blocks access to the fallopian tubes.

• It prevents fertilization by blocking transport of the ovum from the ovaries to the body of the uterus.

24. Which of the following animal tissues contain(s) flattened cells? [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) Plasma cells
(2) Mast cells
(3) Cuboidal epithelium
(4) Squamous epithelium

Correct Answer: (4) Squamous epithelium

Solution:The squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries.

• Theyallow substances to freely move across their surface.

• These cells are located in the lungs and the kidneys.

25. Why are pulsating movements called pulse felt? [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) Due to the circulation of blood in the heart
(2) Due to the circulation of blood in lungs
(3) Due to flow of bloods in veins
(4) Due to flow of bloods in arteries

Correct Answer: (4) Due to flow of bloods in arteries

Solution:Pulsating movements are commonly referred to as a "pulse" because they are associated with the flow of blood in arteries.

• Arteries are blood vessels that carry oxygenated blood away from the heart and deliver it to various parts of the body.

• When the heart contracts during each heartbeat, it pumps blood into the arteries, creating a surge of blood flow.

• This surge of blood causes the arterial walls to expand and contract rhythmically, resulting in a pulsating movement that can be felt in certain areas of the body, such as the wrist, neck, or groin.

26. Why is maintenance processes in biological processes needed? [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) To transfer energy sources in the body of an organism
(2) To feed raw material in the body
(3) To transfer food material outside the body
(4) To prevent damage and destruction

Correct Answer: (4) To prevent damage and destruction

Solution:The maintenance processes are required to prevent damage and breakdown of molecules.

• This source of energy is called food and the process of taking in the food is called nutrition.

• Moreover, every organism needs additional raw materials for growth and repair.

27. During photosynthesis, the carbohydrates synthesised are stored in the form of: [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) proteins
(2) fats
(3) starch
(4) vitamins

Correct Answer: (3) starch

Solution:In plants, Carbohydrates are produced as monosaccharides (glucose or fructose) in the process of photosynthesis.

• Plants store energy in the form of starch, instead of glucose, because starch is insoluble.

28. Where in a human body can anaerobic respiration take place? [RRB Group 'D' CBT Exam, 30.09.2022 (Shift-II)]

(1) Only in striated muscle cells
(2) In the cytoplasm of cells
(3) In mitochondria of all cells
(4) Only in red blood cells in the veins

Correct Answer: (2) In the cytoplasm of cells

Solution:Anaerobic respiration is the process by which energy is released in cells in the absence of oxygen.

• In human beings, anaerobic respiration (both glycolysis and fermentation) takes place in the fluid portion of the cytoplasm.

• In contrast, the bulk of the energy yield of aerobic respiration takes place in the mitochondria.

29. Identify the true statement. [RRB Group 'D' CBT Exam, 06.10.2022 (Shift-II)]

(1) Sperms containing X chromosome have 23 chromosomes but sperms containing Y chromosome have 23 chromosomes.
(2) Sperms containing X chromosome have 22 chromosomes but sperms containing Y chromosome have 22 chromosomes.
(3) Sperms containing X chromosome have 23 chromosomes but sperms containing Y chromosome have 22 chromosome also have 23 chrmosomes.
(4) Sperms containing X chromosome have 22 chromosomes but sperms containing Y chromosome have 22 chromosome also have chromosomes.

Correct Answer: (3) Sperms containing X chromosome have 23 chromosomes but sperms containing Y chromosome have 22 chromosome also have 23 chrmosomes.

Solution:In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46.

• Twenty-two of these pairs, called autosomes, look the same in both males and females.

• The 23rd pair, the sex chromosomes, differ between males and females.

• Females have two copies of the X chromosome, while males have one X and one Y chromosome.

30. Why did Mendel study seven different characters ? [RRB Group 'D' CBT Exam, 06.10.2022 (Shift-II)]

(1) To uncover the universal principles of inheritance
(2) To create many new varieties of pea plants
(3) To produce enough peas for his monastery
(4) To find out which plants were the best

Correct Answer: (1) To uncover the universal principles of inheritance

Solution:Mendel studied seven pairs of contrasting characters for his breeding experiment with a pea.

The experiment was aimed to uncover the universal principles of inheritance.

The pairs selected for his experiment were:

• Pea shape: Round ог Wrinkled.

• Pea color: Green or Yellow.

• Pod shape: Constricted or Inflated.

• Pod color: Green or Yellow.

• Flower color: Purple or White.

• Plant size: Tall or Dwarf.

• Position of flowers: Axial or Terminal.

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