Read the following statements and choose the correct option: 1. Atleast half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis 2. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. 3. They are of paramount importance as secondary producers of energy-rich compounds. 4. Many species of Porphyra, Laminaria and Sargassum are among th

Step-by-step solution

Atleast half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers energy-rich compounds which form the basis of the food cycles of all aquatic animals.Many species of Porphyra, Laminaria and Sargassum are among the 70 species of marine algae used as food.