Page 99 - EVS Class 05

Amphibians

Frogs and toads are amphibians that live both in water and on land. They

breathe with the help of their moist skin when in water.

The young ones of frogs are called
tadpoles. They look like fish and breathe
with the help of gills.

Eels
Eels also live in water. They look like
snakes.

Sea dragons are all fish that look like
floating weeds. They swim with the help

of their very fine fins. Frog Sea Dragon
Mosquitoes and Malaria

Small insects moving in stagnant water can be seen

easily. These are larva of mosquitoes as mosquitoes
breed on stagnant water.

Mosquitoes are parasitic insects that feed on animal
and human blood. Female anopheles mosquito

carries the protozoa of malaria. When this mosquito

bites a person suffering from malaria, the protozoa
are sucked up with the blood. When this mosquito bites
a healthy person, the protozoa are

injected into the healthy person’s body

and cause malaria. The mosquito has a In 1897, Sir Ronald Ross discovered
that it is the female anopheles
germs plasmodium in it. The
mosquito that spreads malaria.
plasmodium does not harm the

mosquito. But, when the mosquito bites a

person, it transmits malaria. Male anopheles mosquito feeds on the juice of
flowers and fruits and it does not spread malaria.

Symptoms of Malaria

A person suffering from malaria has severe headache, fever and chills.

EVS-5
99