Question

What is true about Nereis, scorpion, cockroach and silver fish?

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

Answer 1

The Correct Option is A

To determine the correct statement about Nereis, scorpion, cockroach, and silverfish, let's evaluate each option:

1. Option 1: They all possess a dorsal heart

   This statement is correct. All the organisms listed have a dorsal heart, which is a characteristic of the phylum Arthropoda, to which scorpions, cockroaches, and silverfish belong. Nereis, which belongs to the phylum Annelida, also has a dorsal vessel that functions comparably to a heart.

2. Option 2: None of them is aquatic

   This statement is incorrect. Nereis is an aquatic organism. It is a marine polychaete worm found in marine and sometimes brackish environments.

3. Option 3: They all belong to the same phylum

   This statement is incorrect. Nereis belongs to the phylum Annelida, whereas scorpions, cockroaches, and silverfish belong to the phylum Arthropoda. Therefore, they do not all belong to the same phylum.

4. Option 4: They all have jointed paired appendages

   This statement is incorrect. While scorpions, cockroaches, and silverfish have jointed paired appendages (a characteristic feature of Arthropods), Nereis does not have jointed appendages.

Based on the above analysis, the correct answer is that they all possess a dorsal heart. This characteristic is shared by the listed organisms, supporting blood circulation along a dorsal line.