Endothermic.
Dark reaction needs energy. this energy is supplied by light reaction
The amount of energy needed for a reaction to take place is called the activation energy. It is the minimum amount of energy required for the reactants to transform into products. This energy is needed to break bonds in the reactant molecules before new bonds can be formed.
A reaction releasing energy is called an exergonic reaction, so the opposite of the would be a reaction that needs energy to take place, called an endergonic reaction. These are also known as exothermic and endothermic reactions.
endothermic
Assuming you mean the name: an exothermic reaction.
A chemical reaction that produces energy is said to be exothermic. In comparison, if it consumes energy it is endothermic.
It varies with the differences in chemical reactions
If a reaction requires a constant input of energy, the products are higher in energy than the reactants. This type of reaction is known as endothermic, since it involves an increase in energy of the system. Conversely, reactions that release energy are known as exothermic.
The activation energy barrier in a reaction is also known as the energy barrier or energy threshold. This term refers to the minimum amount of energy required for a chemical reaction to occur.
Endothermic reaction.
Endothermic reaction. See Related Link.
The scientific name for the reaction that gives out energy is exothermic