Chapter 10 (Kingdom Animalia) F.Sc 1st Year Biology Helping Notes

What are Malpighian tubules?

A well developed excretory system comprising of Malpighian tubules is present in arthropods. Malpighian tubules absorb wastes from haemocoel and drop them in hindgut. The nitrogenous wastes are excreted in the form of – solid uric acid

How respiration or exchange of gases occurs in arthropods?

Most arthropods possess an extensive system formed of air tubes called trachea for the exchange of gases. Main tracheal tubes open to the exterior. through openings called spiracles. Aquatic arthropods respire through gills and book lungs.

Why blood is colourless in arthropods?

In arthropods, blood is colourless as it is without haemoglobin.

Describe exoskeleton of arthropods.

The skeleton is external, i.e., exoskeleton. It is in the form of an outer covering, the cuticle, light in weight and formed chiefly of chitin. It provides a surface for the attachment of muscles which help in locomotion.

How locomotion occur in Aschelminthes?

Locomotion is by undulating waves of contraction and relaxation of muscles. The muscular layer is dividend into four longitudinal parts, two dorso-lateral and two ventro-lateral. The circular muscles are absent therefore the bending is dorso-ventral only.

What is importance of Enterobius vermicularis?

Enterobius vermicularis, commonly known as pin worm is cosmopolitan (found everywhere) but more common in Europe and America. Pinworms are parasites in the human caecum, colon and appendix Their movement cause intense itching of anus, inflammation of mucous membrane of colon and appendix resulting in insomnia (sleepless condition) and loss of appetite (hunger).

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