Earthworm (Pheretima) MCQ

Samim Miya

🪱 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.
        

⏳ Time Left: 10:00
📌 Progress: 0/50 answered

1. Earthworm belongs to which phylum?

Arthropoda Mollusca Annelida Nematoda

2. Body segmentation in earthworm is called?

Metamerism Tagmatization Cephalization Symmetry

3. Clitellum is present in which segments?

1–5 14–16 24–26 30–35

4. Earthworm shows which type of symmetry?

Radial Bilateral Asymmetrical Spherical

5. Setae are used for?

Digestion Movement Respiration Excretion

6. Earthworm respiration occurs through?

Lungs Skin Gills Trachea

7. Earthworm is:

Dioecious Hermaphrodite Asexual Parthenogenetic

8. Nephridia are concerned with?

Digestion Excretion Respiration Circulation

9. Earthworm circulatory system is:

Open Closed Absent Mixed

10. Blood in earthworm contains?

RBC Hemoglobin in plasma No pigment Only WBC

11. Typhlosole is related to?

Respiration Digestion Excretion Movement

12. Earthworm excretes mainly?

Urea Ammonia Uric acid Creatinine

13. Nervous system of earthworm consists of?

Brain only Nerve cord Brain + ventral nerve cord None

14. Spermathecae are used for?

Storage of sperm Production of sperm Egg formation Digestion

15. Earthworm fertilization is?

Internal External Both None

16. Earthworm habitat is mainly?

Aquatic Terrestrial Aerial Parasitic

17. Body cavity of earthworm is?

Acoelomate Pseudocoelomate True coelom Absent

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

4/5 5/6 6/7 7/8

19. Clitellum secretes:

Digestive enzymes Cocoon Blood pigment Mucus only

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

21. Which nephridia open outside?

Septal Integumentary Pharyngeal None

22. Typhlosole increases:

Respiration Absorption Excretion Movement

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

24. Spermathecal pores are found in segments:

5–8 6–9 7–10 8–11

25. Earthworm locomotion depends on:

Setae + muscles Wings Fins Cilia only

26. Which structure stores sperm received from another worm?

Testes Spermatheca Seminal vesicle Ovary

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

28. Pharyngeal nephridia are located in:

1–3 4–6 7–9 10–12

29. Earthworm brain is located in:

1–3 segments 3–4 segments 5–6 segments 10–12 segments

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

31. Septal nephridia open into:

Outside body Alimentary canal Blood Skin

32. Which is incorrect?

Earthworm is coelomate Closed circulatory system present Respiration by lungs Segmented body

33. Blood glands are present in:

Anterior segments Posterior segments Entire body Only clitellum

34. Which structure is absent in earthworm?

Heart Brain Nephridia Setae

35. Which segments contain hearts (aortic arches)?

4–7 7–11 10–13 5–9

26. Which structure stores sperm received from another worm?

Testes Spermatheca Seminal vesicle Ovary

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

28. Pharyngeal nephridia are located in:

1–3 4–6 7–9 10–12

29. Earthworm brain is located in:

1–3 segments 3–4 segments 5–6 segments 10–12 segments

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

31. Septal nephridia open into:

Outside body Alimentary canal Blood Skin

32. Which is incorrect?

Earthworm is coelomate Closed circulatory system present Respiration by lungs Segmented body

33. Blood glands are present in:

Anterior segments Posterior segments Entire body Only clitellum

34. Which structure is absent in earthworm?

Heart Brain Nephridia Setae

35. Which segments contain hearts (aortic arches)?

4–7 7–11 10–13 5–9

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

37. Which organ stores sperm produced by same worm?

Spermatheca Seminal vesicle Ovary Testis sac

38. Earthworm is ammonotelic under:

Dry condition Moist condition Extreme heat Winter

39. Which part grinds food?

Crop Gizzard Pharynx Intestine

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

41. Calciferous glands are present in:

Esophagus Crop Gizzard Intestine

42. Which is NOT present in earthworm?

True coelom Blood vessels Nephridia Lungs

43. Which structure increases absorption surface?

Crop Typhlosole Pharynx Mouth

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

A and R true, R explains A A and R true, R not explanation A true, R false A false, R true

45. Which segment contains female genital pore?

12 13 14 15

46. Which type of nephridia is most numerous?

Septal Integumentary Pharyngeal All equal

47. Blood glands help in:

Digestion Formation of blood cells Excretion Movement

48. Which is incorrect?

Earthworm has closed circulation Respiration by skin Has lungs Segmented body

49. Which part temporarily stores food?

Crop Gizzard Intestine Pharynx

50. Final concept: Earthworm belongs to:

Diploblastic animals Triploblastic coelomate Acoelomate Pseudocoelomate

Published by Samim Miya

Founder of CEE Nexus. I share high-quality medical entrance prep resources to help Nepalese students succeed.

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Earthworm (Pheretima) MCQ

Earthworm (Pheretima)

🪱 Introduction

🔬 Classification

⚙️ External Features

🧠 Digestive System

❤️ Circulatory System

🌬️ Respiration

⚡ Excretory System

🔁 Reproduction

🌱 Importance

Published by Samim Miya

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