Please scroll down to get to the study materials.
The life cycle of a mosquito completes in the following four phases:
Mosquitoes copulate in the evening during flight. After copulation, female mosquitoes lay their eggs in stagnant water. The female anopheles lays 40 to 100 eggs at a time. Their eggs are spindle in shape having lateral air floats. A culex lays 200-300 eggs at a time. Their eggs are cigar shaped.
The eggs are hatched into larvae within 2-3 days under suitable conditions. These are transparent and emerge from the lower end of each egg. They are also called Wriggler because of their caterpillar like movements. The body of larvae is divided into head, thorax, and abdomen. The larva of a culex mosquito at rest hangs at an angle from the surface of water whereas the larva of an anopheles lies parallel to the surface of water.
After about a week, the larva moults for the last time and develops into pupa. They are commonly known as tumblers. The body of pupa is comma-shaped. The pupa of a mosquito is very active in comparison to the pupae of other insects. Pupa metamorphoses into mosquito after a short duration.
After metamorphosis, the pupa develops the body organs. Thus animago is formed. Imago is a complete insect stage in which mosquito is completely young. The imago emerges when the pupalskin splits. The mosquito dries its wings by vibrating and then flies in air. After mating between male and female, the female starts laying eggs. The complete lifecycle from eggs to adult takes ten to several days.
The periodic shedding of the outer layer of the skin of larvae of insects to allow further growth is called Moulting.
Differentiation of tissues inside the puparium of insects is called Histogenesis.
Period of rapid transformation from larval to adult stage is called metamorphosis.
Mosquito is harmful to human as well as other animals. Mosquito causes different diseases like malaria, filaria, yellow fever, meningitis, encephalitis, dengue, etc.
Plasmodium is an intracellular blood parasite which causes malarial fever. Its primary host is human where the asexual cycle is completed. The secondary host is a female anopheles mosquito. When an infected female anopheles mosquito bites one, several sporozoites with its saliva enter the blood.
Mosquito larvae breath with the help of respiratory trumpets. During respiration it is on the surface of water and then oil enters inside it which closes trumpets. Hence it dies.
The lifecycle of mosquito completes in the following four phases:
Mosquitoes lay eggs in stagnant water of pond and ditches.
By the study of life cycle of mosquito, we can conclude the female mosquito lays eggs in stagnant water and develop larva and pupa in it. During this stage they can be controlled by using DDT, BHC, kerosene oil etc. Hence, with the help of life cycle of mosquito, we can control them.
Mosquito larva feed on algae and bacteria found in water.
The stages which spend in water in the life cycle of mosquito are:
ii) Larva and
The life cycle of a mosquito completes in ______ phases.
Mosquitoes copulate in the ______ during flight.
The female anopheles lays ______ eggs at a time.
50 to 100
40 to 50
none of these
40 to 100
The eggs are hatched into larvae within ______.
The periodic shedding of the outer layer of the skin of larvae of insects to allow further growth is called ______.