National Science Olympiad Model Paper 1 Questions and Answers Part 10

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Q. 40. Statement: Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrheal diseases.

Reason: Dehydration is common to all types of diarrheal diseases and adequate supply of fluids and electrolytes should be ensured.

A) Both Statement and Reason are correct, and Reason is the correct explanation for Statement.

B) Both Statement and Reason are correct, but Reason is not the correct explanation for Statement.

C) Statement is correct, but Reason is incorrect.

D) Both Statement and Reason are incorrect.

Answer: B

Explanation:

Several types of bacteria can enter your body through contaminated food or water and cause diarrhea. Common bacteria that cause diarrhea include Campylobacter

Escherichia coli (E. coli) , Salmonella, and Shigella. So, Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrheal diseases.

Dehydration takes place when your body loses more fluid than you drink. The most common cause of water loss from the body is excessive sweating and loss of fluids.

Hence, Dehydration is common symptoms to all types of diarrheal diseases and adequate supply of fluids and electrolytes should be ensured.

So, the correct answer is ′ Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

Q. 41. Refer to the given table and select the correct option regarding it.

Refer to the Given Table and Select the Correct Option Regarding It
Milch breeds of cattle
Indigenous pure breedExotic pure breedHybrid breed

A) (i) Ongole, (ii) Kankrej (iii) Holstein

B) (i) Hallikar (ii) -Jersey, (iii) -Frieswal

C) (i) -Sahiwal, (ii) Ongole (iii) -Frieswal

D) (i) -Karan Fries, (ii) -Ayrshire (iii) Kankrej

Answer: B

Explanation

Indigenous pure breed: Hallikar, Amritmahal, khilari, kangayam, bargur, Pulikulam, alambadi, tharparkar, hariyana, kankrej, ongole, Krishna valley, Deoni, Surti , murrah

Exotic Pure Breed: Jersey , Holstein, Brwonswiss, Red Dane, Ayrshire, Guemsey.

Hybrid: Frieswal, Sanga.

Q. 42. Which of the following is correctly matched

Answer: A

Explanation:

Aves possess dry skin, without glands except oil gland near the base of tail.

(ii) Pinnae are not found in aquatic animals and egg laying mammals.

(iii) In cyclostomes, unpaired appendages (joints) are found.

Chondrichthyes is a class that contains the cartilaginous fishes: they are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.

Cyclostomatous is a group of agnathans that comprises the living jawless fishes: the lampreys and hagfishes. Both groups have jawless mouths with horny epidermal structures that function as teeth, and branchial arches that are internally positioned instead of external as in jawed fishes.

Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized by feathers, toothless beaked jaws, the laying of hard-shelled eggs.

Q. 43. Which of the following is correct pairing of fish and its feeding zone from the choices given below.

A) Rohu- Bottom Zone

B) Catla- Middle Zone

C) Common carp- Bottom Zone

D) Mrigal- Surface Zone

Answer: C

Explanation:

Which of the Following is Correct Pairing of Fish and Its Feeding Zone from the Choices Given Below
Feeding AreaFish
Feeding in the surface zoneCatla, Silver carp
Feeding in the middle zoneRohu
Feeding in the bottom zoneMrigal, common carp, Shellfish, Crabs, Crayfish, sea anemones, starfish, snails, bristleworms
Pairing of Fish

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