Fill in the following blanks with suitable words. (e) Common salt has been used to preserve and for ages.
Fill in the following blanks with suitable words:
(a) Alcohol is produced with the help of _________
(b) Blue -green algae fix______directly from air to enhance fertility of soil.
(c) Micro-organisms can be seen with help of a______
(d) Cholera is caused by______
(e) Common salt has been used to preserve______ and ______for ages.
(f) The food material which is preserved by pasteurisation is ______
(g) As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less.______