Question

Bioluminescence was shown by the phylum ____________.

• A. Porifera
• B. Ctenophora
• C. Coelenterata
• D. Mollusca

Answer 1

The correct option is B

Ctenophora

The correct option is B

Explanation of the correct option :

1. Ctenophores are gelatinous marine planktons that can swim with the help of cilia.
2. They are diploblastic and have a tissue level of organization.
3. They are commonly known as comb jellies and are exclusively marine.
4. They have the ability to emit light (bioluminescence), for example, Ctenoplana and Pleurobrachia.

Explanation of the incorrect option :

Option A:

1. Porifera are spore-bearing organisms. They are commonly known as sponges.
2. These pores are known as Ostia. The pores form a water canal system inside their body. The water enters their body with the help of Ostia
3. The food, oxygen, etc., reach the body by a water current through the pores.

Option C:

1. Coelenterates are aquatic animals that can be either non-motile or free-swimming.
2. They got the name due to the presence of specialized cells called cnidoblasts or cnidocytes on their body, for example, Hydra and jellyfish.

Option D:

1. The name "Mollusca" is derived from the Latin word " mollusks " which means "soft". So soft-bodied animals are placed in this phylum.
2. Phylum Mollusca is characterized by the presence of a muscular foot, visceral hump, and head. freshwater, For example, octopus and snails.

Final answer: Bioluminescence was shown by the phylum Ctenophora.