Q.1 Give two examples of each:-
(a) Kharif crop
(b) Rabi kharif
Q.2 Explain how fertilisers are different
from manure.
Q.3 Name the microorganism which can fix atmospheric nitrogen in the soil?
Q.4 write 10 lines on the usefulness of microorganisms in our lives.
Q. 5 Can microorganism be seen with the naked eyes? If not, how can they be seer
Gledu Santor Secondary School
science subject
Answers
Answer:
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Explanation:
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Answer:
1. Examples of : (a) Kharif crop ---> rice, maize
(b) Rabi crop ----> wheat, barley
2. Fertilisers are different
from manure by the following points:
(i) Manure is a natural substance obtained by the decomposed animal wastes whereas fertilizers are human-made inorganic salts or organic compounds.
(ii) Manures can be prepared at homes or fields. On the other hand, the fertilizers can be made only in factories.
3. The microorganism which can fix atmospheric nitrogen in the soil is Rhizobium.
4. Some of the uses of microorganisms in our lives are:
•They are used in winemaking, baking, pickling and other food-making processes.
•Alcoholic fermentation by yeast is widely used in the preparation of wine and bread.
•A bacterium Lactobacillus promotes the formation of curd.
•Microbes are used to reduce pollution.
•They are used to increase soil fertility by fixing atmospheric nitrogen.
•Microbes are also useful in preparing many medicines and antibiotics.
•Certain microbes are also used in the biological treatment of sewage and industrial effluents.
•Some microorganisms are taken as probiotics, that are believed to provide health benefits when consumed.
•Bacteria are also involved in making cheese.
•Acetobacter acetic is used for producing acetic acid from alcohol.
5. Microorganisms can be seen with naked eyes. they can be seen by the microscopes.