Photosynthesis and Respiration

Life without the use of Photosynthesis

Made By: Sierra and Nicole

How does each organism survive and how do they get energy? What are the chemical interactions?

Some of these organisms survive having a symbiotic relationship with one another. Symbiosis is a mutually beneficial relationship. For example, a tube worm and a Beggiatoa bacteria. The tube worm provides the bacteria a place that is safe to live, and the bacteria gives it food. If not, consumer eats directly from bacterial mats,How this works is that there are hydrothermal vents, streams of hot, chemical rich water from the ocean floor that are rich in sulfides. Then the tube worm absorbs these sulfides and the bacteria inside the tube worm generates these chemicals into sugars and sulphuric acids. This way of organisms obtaining energy for food production using inorganic chemicals found in their environment without the use of sunlight is called chemosynthesis.


Formula For Chemosynthesis

CO2+H2O+H2S---->C6H12O6+H2SO4

Carbon Dioxide+Water+Hydrogen Sulphide---->Sugar+Sulphur Compounds

Primary Producers

Primary Consumers

Diagram of Energy Conversions

Life at the vent area is intimately connected to the vent fluid. Seawater slips through the porous crust of the seafloor. It is then heated and reacts with the chemicals in the rock. The heat is believed to come from the magma chamber underneath the floor. This heated water rises through the crust, seeking a way to get to the surface. This is a hydrothermal vent. Underneath the vents and under the seafloor, it is possible that subsurface mini-environments exist. All vent microbes rely on chemosynthesis as their source instead of photosynthesis, because it is dark around the environment.

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Diagram of Mussels during Chemosynthesis

Mussels and tubeworms around a vent are releasing hydrogen sulfide gas. The chemical equation given here for chemosynthesis is just one of a number of possibilities.


Carbon Dioxide + Water + Hydrogen Sulfide = Sugar + Sulfur Compunds

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Interdependence between organisims in relationship to energy transfer.

Giant tube worms and Giant clams form symbiotic relationships with chemosynthetic bacteria. The bacteria thrives inside the animal’s tissues and it provides the animal a built-in food supply. Since tube worms have no mouth they nutrients are absorbed directly into the tissues.


Some vent animals like clams and mussels feed directly on bacteria and octopi prey of those that eat bacteria.

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