Tag: structure of earthworm

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Multiple choice zoology environmental science structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Find out the wrongly matched pair.

  1. Nephridia - Earthworms - help to remove nitrogenous wastes and maintain ionic balance

  2. Malpighian tubules - insects including cockroaches - help in the removal of nitrogenous wastes and osmoregulation

  3. Antennal glands or green glands - excretory organ in the abdominal part of crustaceans like prawns - perform the excretory function

  4. Protonephridia - Rotifers - primarily concerned with ionic and fluid volume regulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm respires by

  1. Clitellum

  2. Ctenidia

  3. Moist skin

  4. Typhlosole
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration takes place through the moist surface of the body of an earthworm. Moist surface aids in easy diffusion of gases. Haemoglobin is the respiratory pigment that helps in transportation of oxygen to different parts of the body. 

Clitellum is the glandular and non-segmented region in the body of an earthworm and is helpful in copulation. 
Ctenidia is the respiratory organ present in molluscs and some insects. 
Typhlosole is a part of the digestive system of an earthworm and increases the absorption and digestion region in the alimentary system.
So, the correct answer is option C.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

If non labelled diagram of earthworm is given, then which special character must be shown to include it in a specific phylum?

  1. Eye

  2. Metamerical segmentation

  3. Clietlum

  4. Anus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metameric segmentation is the defining feature that places earthworms in the phylum Annelida. While clitellum (option C, misspelled as Clietlum) is also characteristic, it is specific to clitellates within annelids, whereas segmentation is the broader phylum-level trait used for classification.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Which of the following animals body shows bilateral symmetry?

  1. Star fish

  2. Jelly fish

  3. Earthworm

  4. Sponge
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bilateral symmetry means the body can be divided into identical left and right halves along a single plane. Among the choices, earthworms exhibit bilateral symmetry, whereas adult starfish and jellyfish show radial symmetry, and sponges are mostly asymmetrical.

Multiple choice zoology environmental science structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

In earthworm, pharyngeal, nephridia are present as three paired tuffs in the segments.

  1. $3$rd, $4$th and $5$th
  2. $4$th, $5$th and $6$th
  3. $5$th, $6$th and $7$th
  4. $6$th, $7$th and $8$th
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In earthworms, pharyngeal nephridia are segmentally arranged excretory organs that occur as three paired tufts of nephridia situated in the 4th, 5th, and 6th segments.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm moves with the help of

  1. Muscles

  2. Setae

  3. Parapodia

  4. Setae and muscles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Earthworm is able to move with the help of combined efforts of muscles and setae. Both of them help in longitudinal and circular movement of the muscles. The coelomic fluid acts as a hydraulic skeleton in the body of an earthworm. It helps to provide stiffness to the body and relaxation of the muscles. Thus option D is correct. 

Parapodia is the organ present in polychaetes, marine worms and is helpful in their locomotion. It is absent in earthworms. So, the correct answer is option D.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Pheretima is

  1. Arboreal

  2. Scansorial

  3. Fossorial

  4. Cursorial
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pheretima is a fossorial animal that lives in moist soil burrows. In summer, when the topsoil is dry, earthworms burrow deep into the soil. The earthworm burrows are lined by slimy secretion of its body. Temperature regulation while others use the underground habitat for protection from predators or for food storage.

So the correct answer is "Fossorial".

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm is

  1. Nocturnal

  2. Diurnal

  3. Aquatic

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earthworm is a reddish brown terrestrial invertebrate that inhabits the upper layers of the moist soil rich in decaying matter. It is nocturnal and during the daytime, it lives in burrows made by boring and swallowing the soil.

So the correct answer is 'Nocturnal'.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Find the odd one out:

  1. Balanoglossus

  2. Herdmania

  3. Saccoglossus

  4. Earthworm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Earthworm belongs to phylum Annelida where as rest of the three belong to phylum Hemichordate. Hemichordates are said to be connecting link between chordate and non chordate because they have their half of the body with notochord whereas half is without notochord.