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

Table of Contents

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.

What is carapace?

In Crustacea, on the dorsal side of the body the exoskeleton is in the form of a covering called carapace.

Give examples of crustaceans.

Each segment in Hirudinea has additional circular rings or markings called annuli.

Why earthworm is termed as natural plough?

Earthworm is perhaps most active segmented worm in churning the soil, therefore it is commonly termed as natural plough.

What is agricultural importance of earthworms?

Burrowing activity of earthworms permits greater penetration of air into the soil, and improves drainage capacity of the soil. It also enables root to grow downwards through the soil more easily. Mixing and churning of the soil is brought about when earth which contains inorganic particles is brought up to the surface from lower regions.

What is carapace?

In Crustacea, on the dorsal side of the body the exoskeleton is in the form of a covering called carapace.

Give examples of crustaceans.

Daphnia, Cyclops, Crabs, Lobsters, Prawn. Wood louise, Ftc. are exame. class Crustacea.

1 thought on “Chapter 10 (Kingdom Animalia) F.Sc 1st Year Biology Helping Notes”

Leave a Comment