Biology
Give suitable explanations for the following:
Hands must be washed before eating food.
Answer
We handle a variety of things like books, coins, furniture, tools and machinery in workshops, seats and supporting rods in buses and even pets and other domestic animals in our day-to-day life. These germs can be picked by us when we touch these objects. They are then transmitted to the different parts of the body, through the water we drink or through the food we eat. Hence it becomes a necessity to wash hands thoroughly before consuming food as it protects us from the diseases that could be spread through these germs/vectors.
Related Questions
Describe the different ways by which the housefly contaminates our food.
What are the four major aspects of personal hygiene?
The figure given below represents an organism. Study the same and answer the following question:
(a) Identify the organism and write its scientific name.
(b) Is it a causative agent of any disease? If yes, name the disease.
(c) Label the guidelines 1, 2 and 3.
(d) Is it a unicellular or a multicellular organism ? Mention the specific category of organisms to which it belongs.
(e) Write one important function of the part numbered 1.
Mosquitoes have become a nuisance in the lives of people. Several steps are recommended to destroy mosquitoes in different stages. One of the step is 'Biological control' in which a kind of fish is introduced in the ponds, as shown below in the figure.
(a) What are the four stages in the life cycle of a mosquito ?
(b) Name the fish which selectively devours mosquito larvae.
(c) Give an example of insecticide (full form) which can be sprayed in ponds and marshy places to kill the larval stages of mosquitoes.