Photosynthesis, taking in sunlight and CO2 and water.
asexual reproduction
Are plants the only organisms in an ecosystem that produce their own food? Ans:yes
plants and algae - they can produce their own food so, they do not need to eat others.
Algae use energy from the sun to produce their own food.
All green plants, including ferns, mosses, algae, flowering plants, trees, grasses etc. can photosynthesise; the process in which a plants converts UV energy and other substances like carbon dioxide into simple sugars which act as the plants food. Hence, these plants can produce their own food
grasses
Plants, algae, and certain bacteria are organisms that are able to produce their own food through a process called photosynthesis. These organisms have chlorophyll, a pigment that allows them to convert sunlight into energy to make their own organic compounds like sugars.
Algae produce there own food as they have chlorophyll. So they usually do not produce disease. But it is interesting to note that the malaria parasite, which affect hundreds of million people each year, worldwide, has evolved from algae most probably.
Organisms that produce their own food are called autotrophs. They can convert sunlight into energy through photosynthesis (plants, algae) or obtain energy through chemosynthesis (some bacteria).
Algae are autotrophs, which means they produce their own food.
Algae protists are the most similar to plants due to their ability to perform photosynthesis and produce their own food using sunlight, just like plants.
Nearly all plants, as well as algae, create oxygen. In fact, all plants and algae that make their own food from sunlight, air, and water do produce oxygen. Two my knowledge, there are only a couple of types of parasitic plants that get food from other plants, and thus do not make their own food or oxygen.