Biology (Part-VIII) (Railway)

Total Questions: 50

41. carrots have a high content of vitamin A. How does eating carrots help a child ? [RRB Croup 'D' CBT Exam, 07.10.2022 (Shift-III)]

(1) It will make the child's bones strong.
(2) It will strengthen the child's vision.
(3) It will give the child a good amount of energy.
(4) It will help the child resist many diseases.

Correct Answer: (2) It will strengthen the child's vision.

Solution:Carrots contain beta-carotene, a substance that the body uses to convert to vitamin A, an important nutrient for eye health.

• An extreme lack of vitamin A can cause blindness.

• Vitamin A can prevent the formation of cataracts and macular degeneration, the world's leading cause of blindness.

42. What is the reason that the lungs have alveoli? [RRB Group 'D' CBT Exam, 07.10.2022 (Shift-III)]

(1) To Increase the surface area
(2) To provide pumping action for the lungs
(3) To increase the volume of the lungs
(4) To give mechanical support to the lungs

Correct Answer: (1) To Increase the surface area

Solution:Alveoli increase the surface area of the human lung.

• It contains many elastic fibres which allows it to expand and recoil according to the volume of air breathed in.

• Thus, by enhancing the lung surface area, Alveoli increase the diffusion of gases between the lungs.

43. There are many methods adopted to prevent transmission of HIV/AIDS. Which of the stated ones is INCORRECT? [RRB Group 'D' CBT Exam, 07.10.2022 (Shift-III)]

(1) Adopting responsible sexual behaviour.
(2) The instruments used for ear piercing, acupuncture, etc., must be sterilised before use.
(3) Transmission by way of drug abuse specially through sharing of needles must be prevented
(4) Prevent HIV infected mosquito bite by using mosquito net.

Correct Answer: (4) Prevent HIV infected mosquito bite by using mosquito net.

Solution:Acquired Immune Deficiency Syndrome (AIDS) is a sexually transmitted viral disease that is caused by infection with the human immunodeficiency virus (HIV).

• People can get or transmit HIV only through specific activities, such as sex or injection drug use.

• So, safe sex with single partner, using condoms during sex and avoiding unsterilized injection needles help in prevention of AIDS.

44. Which of the following is a disadvantage of using contraceptive pills. [RRB Group 'D' CBT Exam, 07.10.2022 (Shift-III)]

(1) Both partners in a couple must take pills.
(2) They can cause menopause.
(3) They may produce hormonal imbalance.
(4) The effect of the pills is irreversible.

Correct Answer: (3) They may produce hormonal imbalance.

Solution:Most oral contraceptives are made with combinations of synthetic estrogen and progestin, a synthetic form of the hormone progesterone.

• After taking the pill, these synthetic hormones enter the brain and act as endocrine disruptors, interfering with the signaling process that is necessary for ovulation.

• For many women, birth contraceptive pills lead to hormone imbalance, which can cause fatigue, depression, low libido, Insomnia, anxiety, etc.

45. Which of the following are at the first trophic level? [RRB Group 'D' CBT Exam, 07.10.2022 (Shift-III)]

(1) Secondary consumers
(2) Primary consumers
(3) Tertiary consumers
(4) Producers

Correct Answer: (4) Producers

Solution:The trophic level of an organism is the position it occupies in a food web.

• Green plants prepare their own food, and they are called producers. They always occupy the first level of a food chain.

• Organisms that depend on other organisms for their food are called consumers.

46. Which of the following is required for the formation of human blood? [RRB Group 'D' CBT Exam, 11.10.2022 (Shift-I)]

(1) Nickel
(2) Copper
(3) Cobalt
(4) Iron

Correct Answer: (4) Iron

Solution:Iron is an essential element for blood production.

• About 70 percent of our body's tron is found in the red blood cells of our blood called hemoglobin and in muscle cells called myoglobin.

• Hemoglobin is essential for transferring oxygen in your blood from the lungs to the tissues.

47. Which method of contraception changes the hormonal balance of the body? [RRB Group 'D' CBT Exam, 11.10.2022 (Shift-I)]

(1) Insertion of Copper-T
(2) Surgical blockage of the fallopian tubes
(3) Use of condoms
(4) Intake of pills

Correct Answer: (4) Intake of pills

Solution:Oral contraceptives include pills that contain hormones that delay or stop ovulation so fertilization does not оссur.

• These pills contain a mixture of estrogen and progesterone hormones which can affect the hormonal balance of the body.

48. During heavy exercise when the demand for energy is high, but the supply of oxygen to produce the energy is limited the muscle cells show__________. [RRB Group D' CBT Exam, 11.10.2022 (Shift-I)]

(1) synthesis of ethanol
(2) accumulation of pyruvate
(3) loss of water
(4) formation of lactic acid

Correct Answer: (4) formation of lactic acid

Solution:During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited.

• Therefore, anaerobic respiration takes places in the muscles cells to fulfil the demand for energy.

• This anaerobic breakdown of glucose leads to the formation of lactic acid (C₃H₆O₃) in muscles.

• The accumulation of lactic acid in muscles leads to muscle cramps and feel tired.

49. During which period did the amount of ozone in the atmosphere begin to drop sharply? [RRB Group 'D' CBT Exam, 11.10.2022 (Shift-I)]

(1) In the 1960s
(2) In the 1990s
(3) In the 1970s
(4) In the 1980s

Correct Answer: (4) In the 1980s

Solution:In the early 1980s, through a combination of ground-based and satellite measurements, scientists found that ozone levels were thinning over the South Pole each spring.

• This thinning of the ozone layer over Antarctica came to be known as the ozone hole.

50. Generally, plants have low energy needs when compared to animals. The main reason for this is the: [RRB Group 'D' CBT Exam, 11.10.2022 (Shift-I)]

(A) presence of large proportion of dead cells in the tissues

(B) absence of mobility

(D) plants release O₂ during repiration

(1) A and B
(2) A and C
(3) A and D
(4) B and C

Correct Answer: (1) A and B

Solution:Plants being sessile stay at one place and lack the basic process of locomotion while animals move from one place to another in search of food. shelter, and mates.

• Besides, most of the plant cells are dead.

• The physical activity performed by the plants is also less than compared to animals.

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