Question

Name the phylum where animals have haemoglobin dissolved in the plasma.

Answer 1

Hint: haemoglobin is the pigment of iron present in the red blood cells. They help in carrying the oxygen and the carbon dioxide throughout the body and place an important role in the respiration. They provide the red color to the erythrocytes or the RBC in the blood.

Complete Answer:
The phylum Annelida includes ringed worms in them. The phylum Annelida belongs to the kingdom Animalia has the haemoglobin dissolved inside the plasma. The animals like earthworms belong to this category. In these animals the haemoglobin is not found in the RBC instead they are found dissolved in the plasma of the blood. Since they are found outside the cells, they are called the extracellular haemoglobin.

Characteristics of Annelids:
- They possess the segmented body and each division in its body is called the segments.
- The bristles are the locomotor organs which are called as setae or chaetae.
- The body of the epithelial cells are covered by the thin cuticle but not chitin.
- It has the straight alimentary canal starting from the mouth to the anus but the digestion takes place outside of the cell. Thus, these annelids have extracellular digestion.
- They possess the close blood vascular system.

Note: Animals like leech, Polychaeta, earthworm, clitellata etc. belong to the phylum Annelida. Mainly in these organisms, the reproduction takes place may be both sexual and asexual reproduction. In earth worms the both male and the female reproductive organ is present in the same organism and hence they are bisexual.