Biology (Part-I) (UPSC)

Total Questions: 50

41. Which one the following group of a plant domesticated in the new world and introduced into the old world? [2014-1]

(a) Tobacco, cocoas, and rubber
(b) Tobacco, cotton and rubbers
(c) Cotton, coffee and sugarcane
(d) Rubber, coffee and wheat

Correct Answer: (a) Tobacco, cocoas, and rubber

Solution:Encyclopedia Britannica: In the 15th and 16th centuries. during the Columbian Exchange: numerous plants, animals, and microbes from old world (Europe, Asia, and Africa) were introduced to the new world (Americas) and vice versa. From the image given in the link, it's evident that Cocoa and Tobacco were introduced from new world to old world so only A fits.

42. Recently, there was a growing awareness in our country about the importance of Himalayan nettle (Girardinia diversifolia) because it is found to be a sustainable source of : [2019-1]

(a) anti-malarial drug
(b) biodiesel
(c) pulp for paper industry
(d) textile fibre

Correct Answer: (d) textile fibre

Solution:There is a community in Khar, a hamlet in Darchula district in far-western Nepal, which produces fabrics from Himalayan nettle. The fabric and the things made from it are sold in local as well as national and international markets as high-end products so D: textile is most suitable.

43. Which of the following statements are correct regarding the general difference between plant and animal cells? [2020-1]

1. Plant cells have cellulose cell walls whilst animal cells do not.

2. Plant cells do not have plasma membrane unlike animal cells which do.

3. Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles.

Select the correct answer using the code given below:

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

Correct Answer: (c) 1 and 3 only

Solution:NCERT Class 10 Science: page 61- Plant cells, in addition to the plasma membrane, have another rigid outer covering called the cell wall. So, statement#2 is incorrect, so by elimination answer is c.

44. According to India's National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels? [2020-1]

1. Cassava

2. Damaged wheat grains

3. Groundnut seeds

4. Horse gram

5. Rotten potatoes

6. Sugar beet

Select the correct answer using the code given below:

(a) 1,2,5 and 6 only
(b) 1,3,4 and 6 only
(c) 2,3,4 and 5 only
(d) 1,2,3,4,5 and 6

Correct Answer: (a) 1,2,5 and 6 only

Solution:National Policy on Biofuels 2018 identified following raw materials for biofuel generation: Molasses, Sugarcane juice, biomass in form of grasses, . agriculture residues (Rice straw, cotton stalk, corn cobs, saw dust, bagasse etc.), sugar containing materials like sugar beet, sweet sorghum, etc. starch containing materials such as corn, cassava, rotten potatoes etc., Damaged food grains like wheat, broken rice etc. In the entire policy document there is no mention of horse gram or groundnut so, #3 and #4 are wrong. By elimination we arrived at answer a.

45. Consider the following statements: [2023-1]

1. Some mushrooms have medicinal properties.

2. Some mushrooms have psychoactive properties.

3. Some mushrooms have insecticidal properties.

4. Some mushrooms have bioluminescent properties.

How many of the above statements are correct?

(a) Only one
(b) Only two
(c) Only three
(d) All four

Correct Answer: (d) All four

Solution:The answer is (d). All four statements are correct. Some mushrooms have medicinal properties. For example, the shiitake mushroom is known to boost the immune system and fight cancer. Some mushrooms have psychoactive properties.

For example, the psilocybin mushroom is known to cause hallucinations and alter consciousness. Some mushrooms have insecticidal properties. For example, the oyster mushroom is known to kill mosquitoes. Some mushrooms have bioluminescent properties. For example, the jack-o'-lantern mushroom is known to glow in the dark.

46. The only snake that builds a nest is: [1995]

(a) Chain viper
(b) King Cobra
(c) Krait
(d) Saw-scaled viper

Correct Answer: (b) King Cobra

Solution:King cobra is the only snake that not only lives in holes but also builds a nest.

47. Which one of the following sets is correctly matched? [1995]

(1) Diphtheria, Pneumonia and Leprosy: Hereditary

(2) AIDS, Syphilis and Gonorrhoea: Bacterial

(3) Colour blindness, Haemophilia and Sickle cell anaemia: Sex linked

(4) Polio, Japanese B encephalitis and Plague: Viral

(a) only 2
(b) only 3
(c) 1 and 4
(d) None of these

Correct Answer: (b) only 3

Solution:Diphtheria, Leprosy, Plague are Bacterial diseases. AIDS, Polio, Pneumonia, Gonorrhoea, Syphilis- Viral disease. Japanese B encephalitis - Protozoan disease. Colour blindness and Haemophilia - Sex linked disease. Sickle cell anaemia is a genetic disease in which RBC became sickle shaped.

48. A person with 'AB' blood group is sometimes called a universal recipient because of the : [1995]

(a) lack of antigen in his blood
(b) lack of antibodies in his blood
(c) lack of both antigens and antibodies in his blood
(d) presence of antibodies in his blood

Correct Answer: (b) lack of antibodies in his blood

Solution:Person having blood group 'AB' is called universal recepient because the 'AB' blood group has no antibody in the blood plasma, So, the person can accept any type of blood group (i.e. A, B and O).

49. Which one of the following is a membrane that protects the developing embryo from desiccation? [1995]

(a) Amnion
(b) Allantois
(c) Chorion
(d) Yolk sac

Correct Answer: (a) Amnion

Solution:The amnion is a membrane that protects the developing embryo by a fluid-filled space called amniotic cavity. Amnion is formed above the embryo.

50. Which one of the following antimicrobial drugs, is suitable for treatment of both tuberculosis and leprosy? [1995]

(a) Isoniazid
(b) P-aminosalicylic acid
(c) Streptomycin
(d) Rifampicin

Correct Answer: (d) Rifampicin

Solution:Leprosy is caused by Mycobacterium leprae and tuberculosis is caused by Mycobacterium tuberculosis. The effective drug for Mycobacterium species is Rifampicin.

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