Tag: earthworm

Questions Related to earthworm

The structure in earthworm which serves as a wedge to force open cracks in the soil is 

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

  1. Peristomium

  2. Setae

  3. Typhlosole

  4. Prostomium

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Correct Option: D
Explanation:

1. The first segment of the earthworm body is called peristomium or buccal segment which bears crescentic mouth. It bears a fleshly lobe-like structure called prostomium which hangs over the mouth ventrally. It is called the boring part as it bores in soil.

2. Setae are locomotory organs of earthworm.
3. Typhlosole enhances the intestinal absorption area in earthworms.
So, the correct option is 'Prostomium'.

In earthworms setae are present in all segments except 

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

  1. First and the last segments

  2. First segment

  3. Clitellum and last segments

  4. First clitellum and last segments

Show answer
Correct Option: D
Explanation:
  • Setae are the locomotory organ of earthworm.
  • Each segment except first (peristomium), last (pygidium) and clitellum bears setae.
  • The number of setae are 80-120 per segments.
So, the correct option is 'First, clitellum and last segments'.

The first body segment of earthworm is 

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

  1. Peristome

  2. Peristomium

  3. Protostomrum

  4. Protostome

Show answer
Correct Option: B
Explanation:

The body of earthworm is made of about 100-150 segments. Segmentation help the earthworm move. Each segment or section has muscles and bristles called setae. The first segment is called peristomium.
So, the correct option is 'peristomium'.

Setae help in locomotion in earthworm but are not uniformly present in all the segments. They are present in
zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

  1. 1st segment

  2. last segment

  3. clitellar segment

  4. 20th-22nd segment

Show answer
Correct Option: D
Explanation:

In each body segment of earthworm, except the first, last and clitellum, there are rows of setae, embedded in the epidermal pits in the middle of each segment.

Match the following and choose the correct answer.

(A) Hermaphrodite (i) Produces blood cells and haemoglobin
(B) Direct development (ii) Testis and ovary in the same animal
(C) Chemoreceptor (iii) Larval form absent
(D) Blood gland in earthworm Sense of chemical substances
zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

  1. A- (ii); B- (iii); C- (iv), D- (i)

  2. A- (iii); B- (ii); C- (iv), D- (i)

  3. A- (i); B- (iii); C- (ii), D- (iv)

  4. A- (ii); B- (iv); C- (iii), D- (i)

Show answer
Correct Option: A
Explanation:

(A) Hermaphrodite - Testis and ovary in the same animal

(B) Direct development - Larval form absent.
(C) Chemoreceptor - Sense of chemical substances
(D) Blood gland in earthworm - Produces blood cells and haemoglobin.
So, the correct answer is (a).

Earthworm and cockroach are ------- in habit.

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

  1. nocturnal

  2. diurnal

  3. annual

  4. seasonal

Show answer
Correct Option: A
Explanation:

  • Animals that are active at night are said to be nocturnal. Cockroaches and earthworm prefer to live in dark places during the day and they are active only at night. 
  • Diurnal animals remain active during the day. E.g: mammals, birds and reptiles.
  • Annual changes in the behaviour of animals are seen due to the changing cycles of day length, annual variability of rainfall etc.
  • Seasonal changes in behaviour occur due to seasonal variations which may cause local climate change, changes in the availability of food etc. E.g: seasonal migration of birds.
So, the correct option is 'nocturnal'.

If an earthworm is possessing $100$ segments, caecum starts from $23^{rd}$, in how many segments typhlosole is extended.

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

  1. $48$

  2. $50$

  3. $52$

  4. $49$

Show answer
Correct Option: A
Explanation:

The typhlosole is a part of the intestine in earthworms. It is folded extensively and increase the surface area for digestion

It runs for almost 25 segments.
Hence starting from 23, it would run upto the 48th segment.
So the correct answer '48'.

Which of the following scientist explained Pheretima posthuma?

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

  1. Darwin

  2. Bose

  3. K. N. Bahal

  4. C.S. Basu

Show answer
Correct Option: C
Explanation:

Darwin is known for his famous theory of evolution. Jagdish Chandra Bose is known for his contribution in the field of radio and microwave optics. Pheretima posthuma is the zoological name of an earthworm. Indian scientist, Karm Narayan Bahl (K. N. Bahl) studied the anatomy of Pheretima posthuma (earthworm). 

So, the correct answer is option C.

Given is an animal followed by three terms or features. Choose the terms which does not match with the animal.
Earthworm.

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

  1. Invertebrate

  2. Annelida

  3. Insecta

  4. None of the above

Show answer
Correct Option: C
Explanation:
Earthworm is an invertebrate and belongs to the annelid phylum whereas Insecta belongs to the arthropods phylum. These two phyla vary with each other by having different skeletons. Annelida contains hydrostatic skeleton whereas arthropods contain chitinous exoskeleton. Hence the correct answer is option C, Insecta.

In earthworm, the spermathecae occur in

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

  1. 4-7 segments

  2. 5-8 segments

  3. 6-9 segments

  4. 7-10 segments

Show answer
Correct Option: C
Explanation:

Spermatheca is four pairs, one pair each in the segments 6$^{th}$, 7$^{th}$, 8$^{th}$, and 9$^{th}$ situated ventrolaterally. These are also called seminal receptacles as they store the spermatozoa from another worm during copulation. 

So the correct answer is '6-9 segments'.