based on what you have learned about photosynthesis, select the true statements. photosynthesis uses light energy to produce food molecules. the reactants of photosynthesis are made of different types of atoms than the products. food provides an organism with energy - rich molecules, which are broken down in cells. the chemical bonds between atoms change during photosynthesis.

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# Brief Explanations:
- **Photosynthesis uses light energy to produce food molecules**: Photosynthesis is a process where plants (and some other organisms) use light energy (from the sun), carbon dioxide ($CO_2$) and water ($H_2O$) to produce glucose ($C_6H_{12}O_6$, a food - like molecule) and oxygen ($O_2$). The general equation is $6CO_2 + 6H_2O+light\ energy
ightarrow C_6H_{12}O_6 + 6O_2$.
- **The reactants of photosynthesis are made of different types of atoms than the products**: According to the law of conservation of mass, atoms are neither created nor destroyed in a chemical reaction. The reactants ($CO_2$ and $H_2O$) and products ($C_6H_{12}O_6$ and $O_2$) of photosynthesis are made up of the same types of atoms ($C$, $H$, and $O$).
- **Food provides an organism with energy - rich molecules, which are broken down in cells**: Food molecules (such as glucose) contain chemical energy in their bonds. In cells, through processes like cellular respiration ($C_6H_{12}O_6+6O_2
ightarrow 6CO_2 + 6H_2O+energy$), these molecules are broken down to release energy (in the form of ATP) that the cell can use for various functions.
- **The chemical bonds between atoms change during photosynthesis**: In photosynthesis, the bonds in $CO_2$ and $H_2O$ are broken, and new bonds are formed to create $C_6H_{12}O_6$ and $O_2$. For example, in $CO_2$ (with $C = O$ double bonds) and $H_2O$ (with $O - H$ single bonds),  new $C - C$, $C - H$, and $C - O$ bonds are formed in glucose.

# Answer:
- Photosynthesis uses light energy to produce food molecules.
- Food provides an organism with energy - rich molecules, which are broken down in cells.
- The chemical bonds between atoms change during photosynthesis.

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