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Q68 (UPPCS/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology)

With reference to 'earthworms', which of the following statements is/are correct ?
1. Earthworms improves soil fertility and are known as farmer's friends.
2. Earthworm has two pair of hearts.
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Result
Your answer: —  Â·  Correct: B

Explanation

Statement 1 is correct: Earthworms are widely known as "farmer's friends." They burrow through the soil, which creates channels that improve aeration and water drainage. Furthermore, they consume organic matter and excrete nutrient-rich waste known as vermicompost or castings, which significantly enhances soil fertility.

Statement 2 is incorrect: A typical earthworm (such as Lumbricus terrestris) does not have two pairs of hearts. Instead, it has a closed circulatory system featuring five pairs of aortic arches. These arches function as pseudo-hearts, pumping blood between the dorsal and ventral vessels to maintain circulation. Therefore, the claim that they have only two pairs is biologically inaccurate in the context of general science.

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SIMILAR QUESTIONS

CDS-I · 2003 · Q111 Relevance score: -0.02

Consider the following statements: I. All nematodes are parasitic in nature II. Earthworms are nocturnal animals III. Annelids have no true coelom. IV. The alimentary canal of flatworms has only one opening. Which of these statements is/are correct?

UPPCS · 2022 · Q148 Relevance score: -1.05

With reference to ecological niche, which of the following statements is/are correct ?
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2. Each species has a distinct niche.
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CDS-I · 2026 · Q8 Relevance score: -1.86

Consider the following statements with reference to manure and organic farming : 1. Vermicompost is rich in organic matter and nutrients. 2. Biofertilizers and bio-pesticides are not used in organic farming. 3. Crop rotation is beneficial in controlling insects, pests and weeds. Which of the statements given above is/are correct ?