Tag: earthworm - morphology, integumentary system , respiration and nervous system

Questions Related to earthworm - morphology, integumentary system , respiration and nervous system

Earthworm has no special sense organs, still they are sensitive to

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

  1. Light and sound

  2. touch and sound

  3. Touch, taste and light

  4. Touch, taste, light and vibrating

Show answer
Correct Option: A
Explanation:

In earthworms there are specialised nerves with photoreceptors in the nerve endings present in the skin and the impulses from these nerves are carried rapidly to the muscles of the earthworm. This makes them sensitive to stimuli such as light and sound. 

So, the correct option is 'Light and sound'.

The common Indian earthworms are:

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

  1. Pheretima and Tigrina

  2. Pheretima and Hirudo

  3. Pheretima and Terrestris

  4. Pheretima and Lumbricus

Show answer
Correct Option: A

If the skin of pheretima dries, it will die because of?

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

  1. Starvation

  2. Dehydration

  3. Asphyxia

  4. Noise

Show answer
Correct Option: C
Explanation:

  • The Earthworm’s skin is protected by a thin cuticle and kept moist by a slimy mucus.  This lets it absorb the oxygen it needs and expel carbon dioxide.  If a worm is dried up by the sun, it will die because the exchange of gases can’t take place.
  • Asphyxia is the condition where the body either doesn't get enough oxygen to continue normal function or has too much carbon dioxide to function properly. Without adequate oxygen, nerve cells in the brain begin to die in about 2-4 minutes, and cell death is irreversible. 
So, the correct option is 'Asphyxia'.

Earthworm has no special sense organs, still they are sensitive to _______________.

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

  1. Light and sound

  2. Touch and sound

  3. Touch, taste and light

  4. Touch, taste,light and vibrating

Show answer
Correct Option: D
Explanation:
Earthworms rely most heavily on their sense of touch. Nerve endings cover the worm's entire body so that he can feel vibrations and different textures in his surroundings. Their sense of touch helps worms avoid predators and safe conditions.
Tiny sensory organs cover worms' bodies and provide their sense of taste. These organs are called chemoreceptors, and they help worms detect chemical sensations, which translate into taste reception. Worms also use these chemoreceptors to smell the air and their potential food source. While worms have no eyes, they are still able to sense (and avoid) the presence of light. Since sunlight is dangerous and can dry out worms' skin, this sense is especially important for their survival.
Worms have no external ears, so their sense of touch and vibration receptors compensate for their lack of hearing.
So, the correct option is 'Touch, taste,light and vibrating'.

Earthworm has around ............ segments on its body.

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

  1. 60 to 100

  2. 100 to 120

  3. 120 to 140

  4. More than 140

Show answer
Correct Option: B
Explanation:
Earthworm (Pheretima) belongs to order Haplotaxiada of class Oligochaeta under the phylum Annelida. The body of earthworm is rounded and divided into a number of segments. There are around 100 to 120 segments on the body of earthworm.
So, the correct answer is '100 to 120'.

In Pheretima, the segments without setae are 

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

  1. First, last and clitellar segments

  2. Only clitellar segments

  3. Only fourth segment

  4. Only second segment

Show answer
Correct Option: A
Explanation:

  • Except for the first, clitellar and last segment, all the other segments have eight setae located around each segment. 
  • The setae look like small bristles sticking out of the earthworm’s skin. The setae can be retracted and are for moving through the soil. The bristle-like setae anchor the segments as they crawl.
So, the correct option is 'First, last and clitellar segments'.

Earthworm is

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

  1. Ureotelic

  2. Ammoneotelic

  3. Uricotelic

  4. Both (1) and (2)

Show answer
Correct Option: A
Explanation:

Ureotelic organisms are those that excrete nitrogenous waste in the form of urea. Earthworms are ureotelic since their nitrogenous waste composition consists of 40% urea and 20% ammonia. 

So, the correct answer is 'Ureotelic'.

Match the following

Sr. No  Column -I Sr.No Column -II
a. Earthworms i Network of tube
b. Aquatic arthropods  ii Lungs 
c. Molluscs iii Gills
d. Terrestrial organisms iv Moist cuticle
e. Insects
zoology environmental science structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

  1. a-i;b-ii;c-iii;d-iv;e-iii

  2. a-iv;b-iii;c-iii;d-ii;e-i

  3. a-iv;b-ii;c-i;d-iii;e-iii

  4. a-iv;b-ii;c-iii;d-i;e-iii

Show answer
Correct Option: A