state gov UPSSSC Van Daroga Mock Test 2022 General Knowledge Ecology and Environment Ecology and Functions of an ecosystem
The species of which of the following kinds of organisms are generally used as biofertilizers?
1. Blue-Green Algae
2. Spirogyra
3. Nostoc
4. Alfa-alfa
Select the correct answer using the codes given below:
1
1, 2, 3 and 4
2
1 and 3
3
1, 2 and 4
4
2, 3 and 4