Multiple choice

Which of the following do not increase the fertility of soil?

a. Rhizobium bacteria b. Blue-green algae c. Lactobacillus bacteria d. Spirogyra algae

  1. Only a and b

  2. Only b and c

  3. Only a and c

  4. Only c and d

  5. Only a and d

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Lactobacillus bacteria and Spirogyra algae do not increase the fertility of soil.