Which of these types of organisms produces the biospherical food supply? Answer: Autotrophs, Photosynthetic organisms, Microbes, and Greenhouse gases. Each type of organism produces some or all of its food through photosynthesis. Carbohydrates are then used by herbivores and carnivores in the process of respiration. Carbon dioxide is then exhaled by animals and returned to the atmosphere through the process of decomposition of organic waste. This carbon is also returned to the atmosphere through decomposition of dead organisms. Soils, too, are important carbon reservoirs.


Many organisms, such as plants, are autotrophs, meaning they produce their own food. These organisms use light, water, carbon dioxide, and other chemicals to produce energy. Many of the plants we know are autotrophs, as are algae and seaweed. Some bacteria are also autotrophs, and they can produce their own food. These organisms produce most of the oxygen in our atmosphere and the bulk of the food that we eat.

The production of food in the biosphere by autotrophs is categorized into three categories. First, there are autotrophs, followed by herbivores and carnivores, and third, omnivores. All three groups are consumers, with herbivores being the primary consumer of autotrophs. The remaining three categories are secondary consumers. Using these classifications, we can see how the food chain is connected to our planet’s ecosystem.

Photosynthetic organisms

Photosynthetic organisms are responsible for the energy needed to power the industrial world. As the population of humans has grown, the need to increase photosynthesis and the efficiency of the processes that convert the output of plants to food has increased. The Green Revolution began in the mid-20th century, resulting in tremendous improvements in agricultural yield. Agricultural advances made possible by the Green Revolution included the use of chemical fertilizers, pest control, plant breeding, and mechanized harvesting. The Green Revolution was an enormous success, limiting severe famine to a few regions but not eliminating widespread malnutrition. In the early 1990s, yields of major crops began declining.

The oxygen produced by the process of photosynthesis is essential for life, but not all photosynthetic organisms use water as a source of electrons. Instead, some organisms utilize light energy to extract electrons from molecules other than water. These organisms, called anoxygenic photosynthetic organisms, are of ancient origin and predate oxygenic organisms. They belong to the domain Bacteria and have representatives in four phyla.


The biosphere’s carbon supply is largely dependent on the activity of microbes, which provide food for larger organisms. The carbon a microbe can produce gets transferred to larger organisms, which in turn release it as waste or decay when they die. Ultimately, most carbon in the biosphere’s food supply stays in the top hundred meters of oceans and is returned to the atmosphere.

Phytoplankton are microscopic organisms that produce about half of the oxygen in the atmosphere. Their metabolism involves the breakdown of complex carbohydrates, which are essential for living organisms. Without these degradative processes, these sugars would accumulate, removing massive amounts of carbon from the biosphere and blocking biological processes. If microbial activity were to cease, life on earth would cease to exist.

Photosynthetic algae

Photosynthetic algae, or photons, are the life force of the biosphere. They produce oxygen and reduce CO2 by photosynthesis. There are many types of algae, including single-celled organisms and multicellular algae. These organisms are part of phytoplankton, the food supply of marine life. In fact, algae are responsible for generating 20% of the world’s oxygen.

The process of photosynthetic algae produces atmospheric oxygen and other beneficial byproducts. These organisms also produce the ozone layer, which protects other organisms from harmful UV radiation. However, the production of oxygen requires water. The availability of water influences the productivity and biomass of ecosystems and also the speed of water cycle. Some of the most common photosynthetic organisms are green algae and anoxygenic plants.

Climate, land use, and agriculture are causing increased concentrations of carbon dioxide in the atmosphere. While carbon dioxide is not harmful in itself, it may increase the rate of photosynthesis in some plants. This can lead to lower quality plants and animals. Plants that use large amounts of fresh water may also be affected by a change in water temperature and precipitation patterns. This may make some species more vulnerable to disease.