Tag: earthworm

Quizzes (3) Questions (59)

Questions Related to earthworm

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

Chaeta of Pheretima is about

  1. 0.025 mm long

  2. 0.25 mm long

  3. 0.5 mm long

  4. 2.5 mm long
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chaeta or cheta is a chitinous bristle or seta found on an insect, arthropod or annelid worms such as the earthworm. They function in locomotion. In Pheretima, chaeta is about 0.25 mm long. 

So, the correct answer is '0.25 mm long'.

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

Gustatoreceptors of Pheretima are present

  1. In the buccal cavity

  2. In the prostomium

  3. In the peristomium

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gustoreceptors are found in the epithelial of the buccal cavity,these cells have sensory hair like processes and their nuclei lie below the middle part of the cells. These receptors severs to smell (olfactory receptors) for taste (gustoreceptors). Earthworms can smell different types of decaying food. Hence gustoreceptors are present in the buccal cavity. 

So the correct answer is 'In the buccal cavity'.

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

Choose the correct answers from the alternatives given.
The chitinous bristles that earthworms use to anchor themselves in the earth and pull themselves along are:

  1. aortic arches

  2. setae

  3. parapodia

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

An earthworm has 100 to 150 body segments, each having muscles and bristles. An earthworm's setae are so tiny, they're almost invisible. He uses them to anchor himself while navigating in the soil, or when a bird is trying to pull him from the ground. The setae is a stiff structure resembling a hair or a bristle, especially in an invertebrate.

So, the correct option is, 'setae'.

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

Somites/metameres/segments present in the body of earthworm are

  1. 60-80

  2. 80-100

  3. 100-120

  4. 120-160
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earthworms are segmented and are externally covered by rings that encircle the body. Earthworm is divided into segments 100-200 segments similar segments called somites or metameres. Segments are separated from each other by distinct ring-like grooves. External segmentation corresponds to the internal segmentation of the body. Each segment of the group of segments can become specialized to perform a particular function.

So the correct answer is '100-200 segments'.

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

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

  1. Starvation

  2. Dehydration

  3. Asphyxia

  4. Noise
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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

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

  1. Light and sound

  2. Touch and sound

  3. Touch, taste and light

  4. Touch, taste,light and vibrating
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

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

  1. 60 to 100

  2. 100 to 120

  3. 120 to 140

  4. More than 140
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.
Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

In Pheretima, the segments without setae are 

  1. First, last and clitellar segments

  2. Only clitellar segments

  3. Only fourth segment

  4. Only second segment
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Earthworm is

  1. Ureotelic

  2. Ammoneotelic

  3. Uricotelic

  4. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.