SELECT * FROM question_mgmt as q WHERE id=4336 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=365 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Microorganisms: Friend and Foe fill in the blanks a microorganisms can be s

Question:

Fill in the blanks:

(a) Microorganisms can be seen with the help of a ____________.
(b) Blue green algae fix __________ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.

Answer:

(a) Microscope

Microorganisms can be seen with the help of microscope because they are very small in size. We cannot see the microorganisms with the naked eyes.

(b) Nitrogen

To increase in the fertility of the soil, the composition of nitrogen should be rich in soil. Blue green algae fix the nitrogen from environment and increases the fertility of the soil.

(c) Yeast

The process of fermentation of alcohol with the help of yeast which is known as fermentation process. With the help of yeast, the carbon dioxide gas production occurs.

(d) Bacteria

Cholera is a water- born bacterial disease. It spreads by impure water.


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  • Answered by Ekta Mehta
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