Who discovered ‘vaccine’ for the first time? Name two diseases which can be prevented by using vaccines.
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Which of the following is an example of carrying out bio-control of pests/diseases using microbes?
Correct answer is option (A) i.e Trichoderma sp. against certain plants pathogens Explanation: A biological control being developed for use in the treatment of plant disease is the fungus Trichoderma. Trichoderma species are free...
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Soil erosion can be prevented by
Correct Answer is (a) raising forests
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We spend crore of Rupees and even thousands of lives every year due to corrosion. How can it be prevented? Explain.
By Galvanization: Coating of a less reactive metal with a more reactive metal e.g. coating of iron surface with Zn to prevent rusting of iron. By greasing/oiling (to keep away...
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Which bacterium causes peptic ulcers? Who discovered the above pathogen for the first time?
(i) Helicobactor pylori (ii) Marshall and Warren
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What is the basic principle of vaccination? How do vaccines prevent microbial infections?
The principle of vaccination is based on the property of `memory' of the immune system. In vaccination, a preparation of antigenic proteins of pathogens or inactivated/live but weakened pathogens is...
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Explain how soil pollution and soil erosion could be prevented.
Prevention of Soil Pollution: 1. Use manures instead of chemical fertilizers. 2. Industrial waste should be treated before release. 3. Avoid use of polythene and plastic or they should not get mixed in...
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Name any two sexually transmitted diseases (STDs). How do these infectious diseases spread from one Person to another?
(i) The two sexually transmitted diseases (STDs) are gonorrhoea and syphilis. These infectious diseases spread from one person to another by sexual contact with an infected person. Two symptoms of STDs are...
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Fruit and leaf drop at early stages can be prevented by the application of:
The correct answer is (2) Auxins helps to prevent premature leaf and fruit fall.
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The noble gas which was discovered first in the sun and then on the earth (a) argon (b) xenon (c) neon (d) helium
(d) He was observed in the spectrum of the sun
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Diseases are broadly grouped into infectious and non infectious diseases.
The correct answer is (d)ii and iv
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