Question

Choose the correct option for the largest phylum of animal kingdom

• A. Chordate
• B. Annelida
• C. Sponge
• D. Arthropoda

Answer 1

The correct option is D

Arthropoda

The correct option is D.

Explanation of the correct option:

1. Arthropoda is the largest phylum of all living things, it includes animals with segmented bodies and an exoskeleton of chitin.
2. They constitute 84% of the animal kingdom.
3. With nearly nine lakh species, Arthropoda is the largest phylum.
4. Arthropoda characteristics: The body is segmented, triploblastic, and bilaterally symmetric.
5. The head, thorax, and abdomen make up the body.
6. Their body is equipped with jointed appendages that aid in movement
7. The organ system level of organization is seen in them.
8. Their circulatory system is open.
9. Blood is present in the coelomic cavity, so called haemolymph.

Explanation of the incorrect options:

Option A:

1. The chordata is the third-largest phylum in the animal kingdom.
2. It includes all the vertebrates.
3. Its main feature is the presence of a notochord.
4. Hence, it is an incorrect option.

Option B:

1. It is a large phylum consisting of segmented worms.
2. It has around 9000 species but it is not the largest phylum.
3. Leeches, earthworms, and polychaete worms are examples of annelids.
4. Hence, it is an incorrect option.

Option C:

1. Sponges constitute the phylum porifera.
2. They are mostly found in marine water but some can also be found in freshwater.
3. They possess pores on their body.
4. Hence, it is an incorrect option.

Final answer: The correct option for the largest phylum of the animal kingdom is arthropoda.