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Photosynthesis - Photoautotrophs use energy from sun to convert water from the soil and carbon dioxide from the air into glucose.
Glucose provides energy to plants and is used to make cellulose which
is used to build cell walls. E.g. Plants, algae, phytoplankton and some bacteria. Carnivorous plants like pitcher plant use photosynthesis
for energy production but depend on other organisms for other nutrients
like nitrogen, potassium and phosphorous. Hence, these plants are
basically autotrophs.
Chemosynthesis - Chemoautotrophs use energy from chemical reactions to make food. The chemical reactions are usually between hydrogen sulfide/methane with oxygen.
Carbon dioxide is the main source of carbon for Chemoautotrophs. E.g.
Bacteria found inside active volcano, hydrothermal vents in sea floor, hot water springs
The hetotrophs depend upon the Autotrophs for making their own food and comparison of autotrophs to heterotrophs are as follows.
Comparision of autotrophs and hetotrophs.
Autotrophs
- An organisms that prepare their own food through photosynsthesis process is called autotrophs.
- Autotrophs also known as producers.
- Autotrophs store chemical energy in carbohydrate food molecules they build themselves.
- Example of autotrophs are plants, algae and some bateria.
- They cannot eat other organisms and their byproduct.
- In food chain, autotrophs make up the first trophic levels.
heterotrophs
- The organisms that cannot prepare their own food and depends on others.
- It is also know as consumer.
- The heterotrophs cannot store chemical energy in carbohydrate food molecule.
- Example of heterotrophs are animals, fungi and many bacteria.
- They can eat other organisms and their byproduct.
- In food chain, heterotrophs form the next trophic levels after plants.
To learn more about Autotrophs here.
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