Very short answer type questions
1) Give two examples each of kharif and rabi crops.
2) What are weedicides?
3) What are antibiotics?
4) Who discovered vaccine for small pox?
5) Which type of micro organisms causes Yellow vein mosaic of bhindi?
6) Name the monomeric unit of cellulose.
7) Write the constituent components of Polycot.
8) Expand PET.
9) Which gas is produced when metals react with acids?
10) Name a metal and a non metal which occur in liquid state.
ans these questions of class 8th science
Answers
Answer:
1. Maize and Rice are kharif crops....
Wheat and barley are Rabi crops.....
2. Weedicides are the chemicals which are sprayed over the fields to get rid of weeds. 2, 4-D (2, 4 dichlorophenoxy acetic acid) acts as a dicot weedicide.
3.Antibiotic: A drug used to treat bacterial infections. Antibiotics have no effect on viral infections. Originally, an antibiotic was a substance produced by one microorganism that selectively inhibits the growth of another.
4.Edward Jenner.
5. virus.
6. Glucose
7. The constituents of polycot are polyester and cotton, while polywool is made with polyester and wool. Explanation: Polyester is used in the making of clothes and is a man-made synthetic fiber.
8. polyethylene terephthalate .
9. hydrogen gas.
10. The metal which exist as a liquid at room temperature is mercury. Non-metal which exist as a liquid at room temperature is bromine.
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