Question

Select the Incorrect statement.
1) Pheretima blood circulation is closed type.
2) Blood glands present above the pharyngeal mass produce only blood cells.
3) In earth worm gascous exchange take place between blood capillaries of outer epidermis and surface film of moisture.
4) In pheretima nephridia present in all body segments except first two segments.

Answer 1

The circulatory system of Pheretima is closed type as the blood flows only through blood vessels. So, blood flows through a system of blood vessels and blood glands that produce blood cells are present behind the pharyngeal mass. Gaseous exchange in earthworm takes place through the skin. Oxygen mixes with the slime on the skin and then the mixture passes through the skin and the capillaries present in the skin. Nephridia are present in each segment compartment, except for the first three on the anterior end and the last one on the posterior end.

So, the incorrect statements are 'Blood glands present above the pharyngeal mass produce only blood cells and in Pheretima nephridia are present in all body segments except the first two segments'.