Question

In which of the following animals post anal tail is found?

• A. earthworm
• B. lower invertebrates
• C. scorpion
• D. snake.

Answer 1

The Correct Option is D

To determine which of the given animals has a post-anal tail, we need to understand the definition and significance of a post-anal tail. In biology, a post-anal tail is an extension of the body past the anal opening and is a characteristic feature of chordates, which include vertebrates like reptiles, amphibians, birds, and mammals.

Let's analyze each of the given options:

• Earthworm: Earthworms are invertebrates belonging to the phylum Annelida. They do not have a post-anal tail. Their body is segmented with no distinct tail.
• Lower Invertebrates: These include various simpler organisms like sponges, corals, and jellyfish. None of these possess a post-anal tail as they do not belong to the chordate group.
• Scorpion: Scorpions are arachnids and belong to the class Arachnida. They have a segmented body but are not considered to have a true post-anal tail as seen in vertebrates.
• Snake: Snakes are reptiles, which are part of the vertebrate group. They do have a clear post-anal tail, which extends beyond the anal opening. This is quite characteristic of vertebrate chordates, which have this feature as part of their body plan.

Based on this analysis, the animal that has a post-anal tail is the snake.

Conclusion: The correct answer is snake, as it is a vertebrate with a post-anal tail, unlike the other options which either lack a tail structure or do not possess a true post-anal tail characteristic of vertebrates.