Photosynthesis everywhere

New theory : How does photosynthesis occur without light energy?

let me show you the theory as it can be hard to understand without it.

3 CO₂ + 9 ATP + 6 NADPH + 6 H⁺ → C₃H₆O₃-phosphate + 9 ADP + 8 P_i + 6 NADP⁺ + 3 H₂O

In the light-independent or dark reactions the enzyme RuBisCO captures CO₂ from the atmosphere and in a process that requires the newly formed NADPH, called the Calvin-Benson Cycle, releases three-carbon sugars, which are later combined to form sucrose and starch.To be more specific, carbon fixation produces an intermediate product, which is then converted to the final carbohydrate products. The carbon skeletons produced by photosynthesis are then variously used to form other organic compounds, such as the building material cellulose, as precursors for lipid and amino acid biosynthesis, or as a fuel in cellular respiration. The latter occurs not only in plants but also in animal when the energy from plants gets passed through a food chain .So as the plants continue to photsynthesize, the animal gets an "unlimited" supply of food for some time.

The fixation or reduction of carbon dioxide is a process in which carbon dioxide combines with a five-carbon sugar, ribulose 1,5-bisphosphate, to yield two molecules of a three-carbon compound, glycerinate 3-phosphate, also known as 3-phosphoglycerate (PGA). GP, in the presence of ATP and NADHT from the light-dependent stages, is reduced to glyceraldehyde 3-phosphate. This product is also referred to as 3-phosphoglyceraldehyde (PGAL) or even as triose phosphate. Triose is a 3-carbon sugar . Most (5 out of 6 molecules) of the G3P produced is used to regenerate RuBP so the process can continue (see Calvin-benson cycle). The 1 out of 6 molecules of the triose phosphates not "recycled" often condense to form hexose phosphates, which ultimately yield sucrose, starch and cellulose. The sugars produced during carbon metabolism yield carbon skeletons that can be used for other metabolic reactions like the production of amino acids and lipids.

I can conclude: That animal which depend on photosynthesis can suvive even without light energy to photosynthesize the "normal way"

Here's a diagram to summarize everything.

ANIMALS CAN PHOTOSYNTHESIZE

From my perspective : Some animals can photosynthesize, because they are incredibly intelligent creatures and can control the amount of food digested in the stomach.Here's are some examples you might be interested in.

LOWER: The sacoglossan showing the green network of ducts which contain the green chloroplasts from its algal food.

UPPER : The aeolid nudibranch which "farms" colonies of brown single-celled algae (zooxanthellae) in its body.

Two quite different groups of sea slugs have evolved ways of using the ability of plants to convert the sun's energy into sugars and other nutrients. In simple terms they have become "solar powered".
The herbivorous sacoglossans are suctorial feeders removing the cell sap from the algae on which they feed. In most, the cell contents are simply digested by the slug. Some species however have evolved branches of their gut which ramify throughout the body wall and contain plastids, which are the photosynthesising "factories" from the algae, alive and operating. In many cases these plastids are chloroplasts, but sacoglossans that feed on red and brown algae are also reported to keep the plastids from these algae alive as well.

I can conclude that some animals are more intelligent than humans as they are able to photosynthesize just by eating algae.