Question

Annelida is advanced over nematoda in having:
(1) Closed circulation
(2) meiameric segmentation
(3) true coelom
(4) flame cells

• A. 1,2 and 3 are correct.
• B. 1 and 2 are correct.
• C. 2 and 4 are correct.
• D. 1 and 3 are correct.

Answer 1

Answer: (A)

The body of annelids is divided into segments called metameres, externally by ring like grooves and internally by vertical peritoneal membranous partitions called septa. The external segmentation corresponds to internal segmentation. The phenomenon is called metameric segmentation. They are coeiomat having a perivisceral cavity divided into compartments. Circulatory system is of closed type.