Question

Differentiation in segmental fashion occurs in

• A. Leech
• B. Starfish
• C. Snails
• D. Ascaris

Answer 1

The correct option is A

Leech

The correct option is A

Explanation for the correct option.

1. Differentiation in segmental fashion occurs in the leech.
2. Leeches lead a parasitic mode of life, they suck the blood of vertebrates.
3. They have suckers inside the mouth.
4. With the help of suckers, leech attaches itself with the body of host.
5. They show metameric segmentation.
6. Body is divided into segments which are identical to each other and they bear organs in each segment.

Explanation for the incorrect option.

Option B:

1. Starfish is a star shaped creature with 5 arms.
2. They belong to echinoderms.
3. They have spines all over their body and are hard- skinned.
4. They don't have segments on their body.

Option C :

1. Snails are shelled gastropod .
2. Snails have lungs for respiration.
3. They have a hard outer covering called shells.
4. Shells protect them from outer environment.

Option D :

1. Ascaris is known as round worm.
2. They are parasitic in nature.
3. Their body is long cylindrical and pointed at both the ends and body is creamy white or pink in colour.

Final answer:

Differentiation in segmental fashion occurs in leech