Question

What is true about nereis, scorpion, cockroach and silverfish?

• A. They all have jointed paired appendages
• B. They all belong to the same phylum
• C. They all possess dorsal heart
• D. None of them is aquatic

Answer 1

The correct option is C

They all possess dorsal heart

The correct option is C.

Explanation of the correct option:

1. The dorsal heart is the single feature that all of these species have in common.
2. All of these invertebrates—nereis, scorpions, cockroaches, and silverfish—have dorsal hearts, which are long, elongated structures found in the middorsal line of the thorax.

Explanation of the incorrect option:

Option A:

1. Nereis do not have jointed limbs, whereas insects have, making them members of the phylum Arthropoda, which has jointed appendages.
2. A jointed appendage is a protrusion from an organism's body that has joints.

Option B:

1. Nereis belongs to the phylum Annelida, not the phylum Arthropoda, which includes scorpions, silverfish, and cockroaches.
2. Arthropods are invertebrate creatures with paired jointed legs, an exoskeleton, and a segmented body.
3. The annelids are triploblastic and coelomate.

Option D:

Nereis is an aquatic annelid, but scorpion, cockroach, silverfish are not.

Final answer: Nereis, scorpion, cockroach, and silverfish all possess a dorsal heart.