It lives in tropical regions of Africa and America. The fertilized female burrows into the skin of feet and produces ulcers. Also it can produce gas gangrene due to secondary infection. Sand fleas are not found in India.
Fleas are blood sucking insects. They are small, wingless and bilaterally compressed. The different types of fleas are:
They are light or dark brown insects. They are smaller in size than mosquitoes.They transmit kala-afar, sand-fly fever and oriental sore. The life cycle of sandflies involves the same four stages as mosquitoes: egg, larva, pupa and adult. Only the female sand-fly bites and its bite is painful and irritating.
These are the commonest of all insects living close to man. They transmit a number of diseases like diarrhea, dysentery, cholera, typhoid fever, trachoma etc.
Larva can be controlled by maintaining a clean environment, avoiding stagnation of water, providing clean drainage etc. Also they can be controlled by using chemical parricides like Paris green, function and abate.
Noise pollution in India can be controlled by the following ways.
Some of the permanent methods for effective birth control are as follows: Sterilization can be done for either males or females. The advantages of sterilization are:
Man does not live alone. His habitation becomes the haunting place of insects, birds and beasts. The household pests are dreadful ones, against which man has to guard to live a healthy, peaceful life.
There are both advantages and disadvantages of state control over education which may be discussed as follow: 1. State provides adequate funds for expansion as well as qualitative improvement of education. Education will face economic difficulty in absence of the state support.
The mechanisms and methods through which political control can be exerted varies in different forms of governments. They can be broadly classified under two heads- Samuel Huntington (1957) described them as 'objective' and 'subjective'; while Eric Nordlinger (1977) used the terms 'Liberal' and 'Penetration'.