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Biology (Part-II) (UPSC)
📆 March 21, 2025
Total Questions: 50
31.
The complete conversion of glucose, in the presence of oxygen, into carbon dioxide and water with release of energy is called :
[1998]
(a) aerobic respiration
(b) anaerobic respiration
(c) glycolysis
(d) hydrolysis
Correct Answer:
(a) aerobic respiration
Solution:
The complete conversion of glucose in presence of oxygen, into carbon dioxide, water and release energy is called aerobic respiration. Anaerobic respiration, occurs in the absence of oxygen.
32.
Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains :
[1998]
(a) polyunsaturated fatty acids
(b) saturated fatty acids
(c) essential vitamins
(d) more carbohydrates and proteins
Correct Answer:
(a) polyunsaturated fatty acids
Solution:
Polyunsaturated fatty acid is an antioxidant, which helps in building of tissues.
33.
Match List-I with List-II and select the answer using the codes given below:
[1998]
List-I (Disease)
List-II (Organism)
A. Malaria
1. Fungi
B. Poliomyelitis
2. Bacteria
C. Tuberculosis
3. Virus
D. Ringworm
4. Protozoan
Codes:
A
B
C
D
(a)
4
3
2
1
(b)
4
3
1
2
(c)
3
4
1
2
(d)
3
4
2
1
(a)
(b)
(c)
(d)
Correct Answer:
(a)
Solution:
Malaria parasite is an protozoan. Tuberculosis is a bacteria. Ring worm is a fungus and Poliomyelitis is a virus.
34.
Haemophilia is a genetic disorder which leads to :
[1998]
(a) decrease in haemoglobin level
(b) rheumatic heart disease
(c) decrease in WBC
(d) non-clotting of blood
Correct Answer:
(d) non-clotting of blood
Solution:
Haemophilia is a sex-linked recessive disorder. Clotting of blood is abnormally delayed that even a simple or small cut will result non stop bleeding in affected individual.
35.
Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of:
[1999]
(a) total internal reflection
(b) interference
(c) diffraction
(d) polarization
Correct Answer:
(a) total internal reflection
Solution:
Endoscopy refers to looking inside the body through endoscope. Endoscope is an instrument used to examine interior of hollow organ of the body through borescope technique.
36.
When ants bite, they inject :
[1999]
(a) glacial acetic acid
(b) methanol
(c) formic acid
(d) stearic acid
Correct Answer:
(c) formic acid
Solution:
When ants bite, they inject formic acid in the muscle tissue. This formic acid is found at the mandible of ants.
37.
In eye donation, which one of the following parts of donor's eye is utilized?
[1999]
(a) Iris
(b) Lens
(c) Cornea
(d) Retina
Correct Answer:
(c) Cornea
Solution:
Generally blindness is caused by the dryness and hardness of cornea. Cornea is a clear layer which helps passing of light. It is an outer layer and can be transferred from one person to another.
38.
Match the hormones in List-I with items in List-II and select the correct answer using the codes given below:
[1999]
List-I
List-II
A. Adrenaline
1. Anger, fear, danger
B. Estrogen
2. Attractingpartners through sense of smell
C. Insulin
3. Females
D. Pheromones
4. Glucose
Codes:
A
B
C
D
(a)
3
1
4
2
(b)
1
3
2
4
(c)
1
3
4
2
(d)
3
1
2
4
(a)
(b)
(c)
(d)
Correct Answer:
(c)
Solution:
Adrenaline is the hormone prepares the body to deal with anger, fear and danger. Estrogen hormone releases from ovary of female. Insulin controls the level of glucagon in blood. Pheromones attracts partners through sense of smell.
39.
Match List-I (Drugs/Chemicals) with List -II (Their uses) and select the correct answer using the codes given below :
[1999]
List-I
List-II
A. Atropine
1. Local anaesthesia
B. Ether
2. Heart trouble
C. Nitroglycerine
3. Dilation of pupil
D. Pyrethrin
4. Mosquito control
Codes:
A
B
C
D
(a)
1
3
2
4
(b)
1
3
4
2
(c)
3
1
4
2
(d)
3
1
2
4
(a)
(b)
(c)
(d)
Correct Answer:
(d)
Solution:
Ether is used as an anesthesia at the time of surgery to prevent pain. Atropine is used as eye drops to dilate the pupil before eye examination. Nitroglycerine is widely used in the treatment of heart. Pyrethrin is biodegradable, non-persistent pesticide which is used to kill mosquitoes, fleas and other insects.
40.
Which one of the following genetic diseases is sex-linked?
[1999]
(a) Royal haemophilia
(b) Tay-Sachs disease
(c) Cystic fibrosis
(d) Hypertension
Correct Answer:
(a) Royal haemophilia
Solution:
Royal haemophilia is sex- linked disease. Clotting of blood is abnormally delayed even small cut will result in non stop bleeding in the affected individual. Queen Victoria was a carrier of this disease and produced haemophilic descendents.
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