Question

photons are critical to the process of photosynthesis because photons
provide the chlorophyll needed to conduct photosynthesis.
provide the electricity needed to excite the chlorophyll in the leaves.
are needed to excite the electrons of the pigment atoms in chlorophyl.
cause leaves to appear green and attract sunlight.
provide the water needed to conduct photosynthesis.

Explanation:

In photosynthesis, photons are light - energy particles. They strike the chlorophyll pigments. The energy from photons excites the electrons in the pigment atoms of chlorophyll, which initiates the light - dependent reactions. Chlorophyll is a pre - existing pigment and not provided by photons. Photons are not electricity or water. The green color of leaves is due to chlorophyll's absorption properties, not photons making leaves green to attract sunlight.

Answer:

are needed to excite the electrons of the pigment atoms in chlorophyl.