Nervous System of Earthworm
Biology

Nervous System of Earthworm

The brain is formed of the supra pharyngeal ganglia (segment earthworm). It is a bilobed mass of nervous tissue situated on the dorsal wall of…
Excretory System of Earthworm
Biology

Excretory System of Earthworm

Excretion is the process of elimination of metabolic waste products from the body. In earthworm, excretion or excretory system is effected by minute paired tubes called…
Circulatory System of Earthworm
Biology

Circulatory System of Earthworm

In the body of earthworm there are two median longitudinal vessels. The dorsal longitudinal vessel runs above the alimentary canal. The ven-tral longitudinal vessel runs…
Digestive System of Earthworm
Biology

Digestive System of Earthworm

The digestive system runs as a straight tube from mouth to anus. The mouth is situated in the first segment. The mouth opens into the…
Body Wall and Body Cavity of Earthworm
Biology

Body Wall and Body Cavity of Earthworm

Earthworms are invertebrates. Their skin is permeable, allowing water to pass through. They must live in damp habitats or they will dry out and die.…
External Apertures of Earthworm
Biology

External Apertures of Earthworm

Earthworms are nocturnal animals. They lie in the burrows during the day and come out at night for food. Earthworm leaves the burrow only during…
External Features of Earthworm
Biology

External Features of Earthworm

Earthworms are nocturnal animals. Generally, they have a reddish-brown color with a cylindrical body. They lie in the burrows during the day and come out…
Control of Malaria
Biology

Control of Malaria

The control of malaria measures fall under the following three categories. Treatment of infected patient (1) Plasmodium does not produce antitoxins or antibodies in human…
Types of Malaria
Biology

Types of Malaria

The disease caused by Plasmodium is known as malarial fever. It is charcterised by recurring bouts of fever, each lasting several hours. The febrile condition…
Life cycle in the Mosquito: Sporogony
Biology

Life cycle in the Mosquito: Sporogony

When a female anopheles mosquito bites an infected person, it sucks blood along with all the stages of parasite. But in the gut of the…
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