Biology (Part-VII) (Railway)

Total Questions: 50

21. Dialysis is the procedure done to remove the waste products from the blood when the normal functioning of kidneys is affected. The steps of dialysis are given below but not in the proper order. Which option shows the correct sequence of these steps? [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-I)]

(a) Line to vein

(b) Patient's blood passed through a tank with dialysing fluid

(c) Line from artery

(d) Waste products form the blood pass into dialysing fluid

(e) Dialysing fluid has same osmotic pressure as blood except the wastes

Correct Answer: (2) c-b-e-d-a
Solution:The steps involved in dialysis are as follows:

• Blood line from artery

•  Passage of patient's blood through a tank with dialysing fluid

• Dialysing fluid has same osmotic pressure as blood except the wastes

• Passing waste products from blood into dialysing fluid

• Blood line to vein

22. Red cabbage is a natural indicator which gives different colour when mixed with an acid or a base. Identify the change in colour when it is mixed with an alkaline solution. [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (4) Bluish green
Solution:Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base.

• The pigment turns red in acidic solution with a pH less than 7 and the pigment turns bluish-green in alkaline (basic)solution with a pH greater than 7.

23. Warts are caused by: [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (3) virus
Solution:Warts are a type of skin infection caused by the human papillomavirus (HPV).

•  The infection causes rough, skin-colored bumps to form on the skin.

• They develop when the human papillomavirus, or HPV, enters a cut or break in the skin and causes an infection.

24. The site of complete digestion of carbohydrates, proteins and fat is: [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (2) the small intestine
Solution:The small intestine is the site of complete digestion of carbohydrates, proteins, and fats.

• It receives the secretions from liver and pancreas for this purpose.

• Carbohydrates, proteins, and fats are digested in the intestine, where they are broken down into their basic units:

• Carbohydrates into sugars

• Proteins into amino acids

• Fats into fatty acids and glycerol

25. The gum produced by various types of trees like Acacia trees is__________. [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (4) a waste product of these plants
Solution:Resins and gums are metabolic by-products of plant tissues.

• They are formed in specialized structures called passages ducts.

• These byproducts are accumulated in the vacuoles of the aging cell such as old xylem.

26. Where can we find spores in a fern plant? [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (3) At the underside of leaves
Solution:Ferns reproduce through spores which are present underneath the leaves.

• Spore formation is a type of asexual reproduction in which a new organism forms through spores.

• Sori are clumps of sporangia that hold the reproductive spores.

27. Which of the following is used to detect the presence of starch in food? [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (1) lodine solution
Solution:Starch is the most common carbohydrate present in the diet of human being.

• lodine is used to detect the presence of starch in food.

• If starch is present in a food product, it turns blue-black colour when iodine solution is added.

28. In which of the following animals does the body temperature NOT depend on the temperature in the environment? [RRB Group 'D' CBT Exam, 17.09.2022 (Shift-III)]

Correct Answer: (4) Birds and mammals
Solution:Birds and mammals are warm-blooded animals which means they maintain a constant body temperature.

• Hence, they are not affected by temperature change in environment.

29. Which of the following methods is used to measure the extent of STD? [RRB Group 'D' CBT Exam, 19.09.2022 (Shift-II)]

Correct Answer: (2) Condom
Solution:Consistent and correct use of latex condoms reduces the risk of sexually transmitted disease (STD) and human immunodeficiency virus (HIV) transmission.

• Evidence of condom effectiveness is also based on theoretical and empirical data regarding the transmission of different STDs, the physical properties of condoms, and the anatomic coverage or protection provided by condoms.

30. What is the percentage of oxygen in air normally inhaled and exhaled by human beings? [RRB Group 'D' CBT Exam, 19.09.2022 (Shift-II)]

Correct Answer: (1) Around 21% in inhaled air and 16% in exhaled air
Solution:Inhaled air is a mixture of different gases present in the atmosphere.

• It contains around 78% nitrogen, 21% oxygen, 0.04% of carbon dioxide and other gases.

• This oxygen is used by the body for respiration and therefore the exhaled has less percentage of oxygen (13.6% to 16%).