Biology (Part-III) (UPSC)

Total Questions: 50

31. Consider the following statements: [2004]

1. Toothless mammals such as Pangolins are not found in India.

2. Gibbon is the only ape found in India.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Correct Answer: (b) 2 only

Solution:Gibbon is the only ape found in rain forests of Assam in India, whereas Pangolins are found in tropical Asia and Africa.

32. In which organ of the human body, lymphocyte cells formed? [2004]

(a) Liver
(b) Long bone
(c) Pancreas
(d) Spleen

Correct Answer: (b) Long bone

Solution:Lymphocytes are the cells that determine the specificity of the immune response to infectious microorganisms and other foreign substances. In humans lymphocytes make up 25 to 33% of the total number of leukocytes. Lymphocytes cells originate from bone marrow of long bones and Hen migrate to lymphatic system.

33. Assertion (A): Fatty acids should be a part of the balanced human diet. [2004]

Reason (R): The cells of the human body cannot synthesize any fatty acids.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and Rare individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) Ais false but R is true

Correct Answer: (c) A is true but R is false

Solution:Assertion is true because a balanced diet is a diet which contains the correct amount of carbohydrates, proteins and fats. But the reason is false, because human body cells synthesize various fatty acids except linoleic and linolenic fatty acids.

34. Consider the following statements: [2004]

1. Femur is the longest bone in the human body.

2. Cholera is a disease caused by bacteria.

3. 'Athlete's foot' is a disease caused by virus.

Which of the statements given above are correct?

(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2 and 3

Correct Answer: (a) 1 and 2

35. Consider the following statements: [2005]

1. Dengue is a protozoan disease transmitted by mosquitoes.

2. Retro-orbital pain is not a symptom of dengue.

3. Skin rash and bleeding from nose and gums are some of the symptoms of dengue.

Which of the statements given above is/are correct?

(a) 1 and 2
(b) 3 only
(c) 2 only
(d) 1 and 3

Correct Answer: (b) 3 only

Solution:Dengue viruses are transmitted to humans through the bites of infective female Aedes mosquito. The symptoms of disease is characterized by high fever, severe muscle pain, joint pain and rashes in body.

The Aedes aegypti mosquito is the main transmitter of dengue, Zika, chikungunya and yellow fever viruses.

36. Which of the following diseases of milching animals are infectious ? [2005]

1. Foot and mouth disease

2. Anthrax

3. Black Quarter

4. Cowpox

Select the correct answer using the codes given below:

(a) 1, 2 and 3
(b) 2, 3 and 4
(c) 1 and 4
(d) 1, 2, 3 and 4

Correct Answer: (d) 1, 2, 3 and 4

37. Assertion (A): All the proteins in our food are digested in small intestine only. [2005]

Reason (R): The protein-digesting enzyme from pancreas are released into small intestine.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and Rare individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) Ais false but R is true

Correct Answer: (d) Ais false but R is true

Solution:Assertion is false because protein digestion occurs in stomach and small intestine. But reason is true because the proteolytic enzyme from pancreas secretion immediately enters to small intestine from the stomach.

38. Assertion (A): Amoeba reproduces by fission. [2005]

Reason (R): All unicellular organisms reproduce by asexual methods.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and Rare individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) Ais false but R is true

Correct Answer: (a) Both A and R are individually true and R is the correct explanation of A

Solution:Assertion is correct and reason is the correct explanation of assertion.

Amoeba is a unicellular animal. It reproduce by the process of asexual reproduction. Fission is one of the processes of asexual reproduction, where amoeba divides in half to produce

39. Assertion (A): The person with Diabetes insipidus feels thirsty. [2005]

Reason (R): A person with Diabetes insipidus suffers from excess secretion of vasopressin.

(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and Rare individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) Ais false but R is true

Correct Answer: (c) A is true but R is false

Solution:Assertion is correct but the reason is false. Deficiency of vasopressin results Diabetes insipidus. In this disease the patients produce enormous quantities of dilute urine and the patient consequently feels thirsty.

Diabetes insipidus (water diabetes) is a rare condition caused by a reduction in, or failure to respond to, anti-diuretic hormone.

40. Pneumoconiosis affects the workers who work mainly in : [2005]

(a) Tanneries
(b) Coal mining industry
(c) Distilleries
(d) Glass industry

Correct Answer: (b) Coal mining industry

Solution:Pneumoconiosis is a respiratory disease caused by the inhaling various type of dust, such as coal dust, silica dust, asbestos dust etc. So, it is very common in workers of coal mining industries and related industries.

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