At least ______ of the carbon dioxide fixation on earth is carried out by algae through
photosynthesis.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. Half.
At least 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. Carbon dioxide fixation means the conversion of inorganic carbon to organic carbon by living organisms.
- Algae are chlorophyll-containing simple, thalloid, autotrophic, and largely aquatic organisms.
- These are found in both freshwater and marine habitats.
- Some algal forms are also found in moist habitats like wet rocks and soil, tree trunks, etc. About 70 species of marine algae are used as food.
- Algae are essential for the respiration of aquatic life.