Tapeworm
Earthworm
Centipede
Crayfish
Shark
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The selected answer is wrong:
All members of three large animal phyla are metameric: Annelida, Arthropoda, and Chordata......Tapeworms are segmented but not metamerically segmented....... All other options belong to the classes above except Tapeworm..... therefore the correct answer is A. Tapeworm
REF: https://en.m.wikipedia.org/wiki/Metamerism_(biology) and.
https://global.britannica.com/science/segmentation-zoology
The correct answer is A because
Metameric segmentation means the body is divided into repeating segments. This is a common feature in many invertebrate phyla, including annelids (earthworms), arthropods (centipedes, crayfish), and platyhelminthes (tapeworms).
Sharks, however, belong to the phylum Chordata, which includes vertebrates. While they have a segmented vertebral column, their external body form is not segmented in the same way as invertebrates.
The correct answer is E.
Explanation:
Metameric segmentation is the repetition of organs and tissues at intervals along the body of an animal, thus dividing the body into a linear series of similar parts or segments (metameres). It is most strikingly seen in Annelida.
The correct answer is E because
Metameric segmentation means the body is divided into repeating segments. This is a common feature in many invertebrate phyla, including annelids (earthworms), arthropods (centipedes, crayfish), and platyhelminthes (tapeworms).
Sharks, however, belong to the phylum Chordata, which includes vertebrates. While they have a segmented vertebral column, their external body form is not segmented in the same way as invertebrates.
The correct answer is:
E. Shark
Explanation:
Metameric segmentation refers to the repetition of similar body segments along the longitudinal axis of an organism. It is a characteristic of annelids, arthropods, and some chordates.
Tapeworm (A) – Exhibits segmentation in the form of proglottids, though this is not true metamerism.
Earthworm (B) – A classic example of true metameric segmentation, as it belongs to Phylum Annelida.
Centipede (C) – An arthropod with segmented body parts.
Crayfish (D) – Another arthropod, with a segmented body divided into cephalothorax and abdomen.
Shark (E) – Does not exhibit true metamerism. Sharks belong to Phylum Chordata, Class Chondrichthyes, and while they have a segmented vertebral column, they do not have external segmentation like annelids or arthropods.
Thus, the shark is not metamerically segmented.
The correct answer is:
E. Shark
Explanation:
Metameric segmentation refers to the repetition of body segments along the length of an animal's body, commonly seen in annelids and arthropods. Let's analyze each option:
1. Tapeworm (A) – Exhibits segmentation in the form of proglottids, which are repeated reproductive segments.
2. Earthworm (B) – A classic example of metameric segmentation; its body is divided into repeated segments.
3. Centipede (C) – Has a segmented body with repeated pairs of legs, showing clear metamerism.
4. Crayfish (D) – An arthropod with a segmented body, though some segments are fused into specialized regions.
5. Shark (E) – Sharks belong to the class Chondrichthyes (cartilaginous fish) and do not have true metameric segmentation. Their muscles show some segmentation (myotomes), but their body structure does not follow true metamerism like annelids or arthropods.
Thus, sharks are NOT metamerically segmented.
