GENERAL KNOWLEDGE

Detailed explanation-1: -The principal marine primary producers are cyanobacteria, algae and marine plants. The oxygen released as a by-product of photosynthesis is needed by nearly all living things to carry out cellular respiration. In addition, primary producers are influential in the global carbon and water cycles.

Detailed explanation-2: -Primary producers-including bacteria, phytoplankton, and algae-form the lowest trophic level, the base of the aquatic food web. Primary producers synthesize their own energy without needing to eat.

Detailed explanation-3: -These primary producers, including higher plants and photosynthetic algae and cyanobacteria, are the foundation of natural ecosystems on Earth. The energy fixed by these autotrophic organisms is transferred along complex food webs, ultimately sustaining the vast majority of life on Earth.

Detailed explanation-4: -Cyanobacteria, also called blue-green algae, are microscopic organisms found naturally in all types of water. These organisms are primary producers who use sunlight to make their own food.

Detailed explanation-5: -Most algae possess chlorophyll a. As primary producers, they use the sunlight energy to convert inorganic substances into simple organic compounds, and, provide the principal basis of food webs on the Earth.