Multiple choice

Algae are important for human beings because

  1. they can be turned to important diet in future

  2. they purify atmosphere

  3. both 1 and 2

  4. none of these

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

Algae are important because they are a potential food source (rich in nutrients) and they perform photosynthesis, which helps in purifying the atmosphere by consuming CO2 and releasing oxygen.