question_answer 1)

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   (b) atmospheric nitrogen (c) yeast   (d) bacteria.