The chemical that acts as a catalyst in the photosynthesis process is
1. oxygen
2.hydrogen peroxide
3.chlorophyll
4.carbon dioxide
5.water

chlorophyll

Explanation:

The work of chlorophyll is to absorb light energy from sunlight and transfer it to other molecules used for a process of photosynthesis. This energy is utilized in synthesize carbohydrates using CO2. Further, it also doesn't use in a reaction of photosynthesis hence it acts as the catalyst in this reaction.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.