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Earthworm (Pheretima) MCQ

CEE NEXUS Team April 26, 2026
Earthworm (Pheretima) MCQ

Earthworm (Pheretima)

NEB / CEE Biology Study Material

🪱 Introduction

Earthworm is a terrestrial annelid belonging to phylum Annelida. It is commonly found in moist soil and plays an important role in maintaining soil fertility. It is often called the "friend of farmers" due to its beneficial activities.

🔬 Classification

  • Phylum: Annelida
  • Class: Oligochaeta
  • Genus: Pheretima

⚙️ External Features

  • Body is long, cylindrical, and segmented (metameric segmentation)
  • Covered with moist cuticle
  • Presence of clitellum (reproductive structure)
  • Setae present for locomotion

🧠 Digestive System

  • Complete digestive tract
  • Mouth → Pharynx → Esophagus → Crop → Gizzard → Intestine → Anus
  • Gizzard helps in grinding food

❤️ Circulatory System

  • Closed circulatory system
  • Blood contains hemoglobin dissolved in plasma

🌬️ Respiration

Respiration occurs through moist skin (cutaneous respiration).

⚡ Excretory System

Excretion is carried out by nephridia.

🔁 Reproduction

  • Hermaphrodite (both male and female organs present)
  • Cross-fertilization occurs
  • Clitellum forms cocoon

🌱 Importance

  • Improves soil fertility
  • Aerates soil
  • Used in vermicomposting
Earthworms are called "ecosystem engineers" because they improve soil structure and nutrient cycling.
© CEE NEXUS
⏳ Time Left: 10:00
📌 Progress: 0/50 answered

1. Earthworm belongs to which phylum?

2. Body segmentation in earthworm is called?

3. Clitellum is present in which segments?

4. Earthworm shows which type of symmetry?

5. Setae are used for?

6. Earthworm respiration occurs through?

7. Earthworm is:

8. Nephridia are concerned with?

9. Earthworm circulatory system is:

10. Blood in earthworm contains?

11. Typhlosole is related to?

12. Earthworm excretes mainly?

13. Nervous system of earthworm consists of?

14. Spermathecae are used for?

15. Earthworm fertilization is?

16. Earthworm habitat is mainly?

17. Body cavity of earthworm is?

18. First dorsal pore in earthworm is present between segments:

19. Clitellum secretes:

20. Assertion (A): Earthworm shows closed circulatory system.
Reason (R): Blood flows through vessels.

21. Which nephridia open outside?

22. Typhlosole increases:

23. Assertion (A): Earthworm is ureotelic.
Reason (R): It excretes urea under moist conditions.

24. Spermathecal pores are found in segments:

25. Earthworm locomotion depends on:

26. Which structure stores sperm received from another worm?

27. Assertion (A): Earthworm blood contains hemoglobin.
Reason (R): Hemoglobin is dissolved in plasma.

28. Pharyngeal nephridia are located in:

29. Earthworm brain is located in:

30. Assertion (A): Fertilization is external.
Reason (R): Cocoon formation occurs outside body.

31. Septal nephridia open into:

32. Which is incorrect?

33. Blood glands are present in:

34. Which structure is absent in earthworm?

35. Which segments contain hearts (aortic arches)?

26. Which structure stores sperm received from another worm?

27. Assertion (A): Earthworm blood contains hemoglobin.
Reason (R): Hemoglobin is dissolved in plasma.

28. Pharyngeal nephridia are located in:

29. Earthworm brain is located in:

30. Assertion (A): Fertilization is external.
Reason (R): Cocoon formation occurs outside body.

31. Septal nephridia open into:

32. Which is incorrect?

33. Blood glands are present in:

34. Which structure is absent in earthworm?

35. Which segments contain hearts (aortic arches)?

36. Assertion (A): Earthworm shows peristaltic movement.
Reason (R): Alternate contraction of circular and longitudinal muscles occurs.

37. Which organ stores sperm produced by same worm?

38. Earthworm is ammonotelic under:

39. Which part grinds food?

40. Assertion (A): Earthworm has no respiratory organs.
Reason (R): Diffusion occurs through moist skin.

41. Calciferous glands are present in:

42. Which is NOT present in earthworm?

43. Which structure increases absorption surface?

44. Assertion (A): Earthworm is hermaphrodite.
Reason (R): Self-fertilization occurs.

45. Which segment contains female genital pore?

46. Which type of nephridia is most numerous?

47. Blood glands help in:

48. Which is incorrect?

49. Which part temporarily stores food?

50. Final concept: Earthworm belongs to:

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