<Li> Producers ( autotrophs ) are typically plants or algae . Plants and algae do not usually eat other organisms , but pull nutrients from the soil or the ocean and manufacture their own food using photosynthesis . For this reason , they are called primary producers . In this way , it is energy from the sun that usually powers the base of the food chain . An exception occurs in deep - sea hydrothermal ecosystems , where there is no sunlight . Here primary producers manufacture food through a process called chemosynthesis . </Li>
<Li> Producers ( autotrophs ) are typically plants or algae . Plants and algae do not usually eat other organisms , but pull nutrients from the soil or the ocean and manufacture their own food using photosynthesis . For this reason , they are called primary producers . In this way , it is energy from the sun that usually powers the base of the food chain . An exception occurs in deep - sea hydrothermal ecosystems , where there is no sunlight . Here primary producers manufacture food through a process called chemosynthesis . </Li>
where do the organisms in the first trophic level get their energy from
where do the organisms in the first trophic level get their energy from
sun
sun