Question

Which one is the most striking or (common) character of the vertebrates?

• A. Presence of notochord.
• B. Presence of triploblastic condition.
• C. Presence of gill pouches.
• D. Presence of coelom.

Answer 1

The correct option is A

Presence of notochord.

The correct option is A.
Explanation for the correct option:

1. Animals that have a vertebral column and/or notochord at any stage in their existence are said to be vertebrates.
2. The existence or absence of vertebrates is one of the categories used to categorize life.
3. There are five essential traits that characterize all vertebrates.
4. They are strong-willed.
5. They are skull-shaped.
6. They are endoskeleton-equipped.
7. They are symmetrical on both sides.
8. There are two sets of appendages on them.
9. All embryonic and some adult chordate animals have a notochord, a cartilaginous skeletal rod that supports the body.
10. All members of the phylum Chordata share an embryonic midline structure called the notochord, which offers the growing embryo mechanical and signaling cues.
11. The notochord, which develops in vertebrates from the dorsal organizer, is essential for healthy vertebrate development.

Explanation for the incorrect options:
Option B:

1. The ectoderm, mesoderm, and endoderm are the three major germ layers that make up the gastrula in a condition known as triploblastic.
2. At the blastula stage of development, the embryo reserves germ cells that are later integrated into the gonads during organogenesis.
3. When the blastula gastrulates, the germ layers develop.
4. Multicellular creatures, especially flatworms (Phylum Platyhelminthes), molluscs (Phylum Mollusca), arthropods (Phylum Arthropoda), and chordates, can exhibit triploblastic (Phylum Chordata).

Option C:

1. A gill pouch is any of a group of paired linear pouches that develop as outgrowths of the throat wall in chordate embryos.
2. They develop into the gill slits in fish and some amphibians.
3. Fish are aquatic vertebrates that lack limbs with digits, such as fingers or toes, but do have gills.
4. Recall that animals with internal backbones are known as vertebrates.
5. The majority of fish have streamlined bodies in general.

Option D:

1. The main body cavity in the majority of animals, the coelom, is situated between the digestive canal and the body wall.
2. Animals with coelom have a space between their body wall and digestive system.
3. Arthropods, molluscs, and annelids are a few examples.
4. Animals classified as pseudocoelomate have a body cavity that is not lined with mesoderm.
5. Mesoderm is dispersed across the ectoderm and endoderm of these animals.
6. Any invertebrate with a three-layered body with a pseudocoel is referred to as a pseudocoelomate or blastocoelomate.

Final answer: The presence of notochord is the most striking or (common) character of the vertebrates.