Question

In evolution, .............. evolved fifteen times in Annelida.

• A. Cephlaization
• B. True coelom
• C. Bilateral symmetry
• D. Triploblastic nature

Answer 1

The correct option is B True coelom

The phylum Annelida is known so due to the overt segmentation exhibited by most members of the group. The phyla with more than 17000 species, includes ragworm, earthworms and leeches. These are bilaterally symmetrical, triploblastic and coelomate organisms. The coelom is the main body cavity and positioned inside the body to contain the digestive tract. Animals with true coelom are known as coelomates where the fluid filled body cavity called a coelom is complete with a lining called peritoneum.

So, the correct answer is option B.