“Fill in the diagram below to compare and contrast photosynthesis and cellular respiration. In the center is the products and reactants of those reactions. Write which step it is used for, or from which step it is produced. Finally describe the energy for each process.”

The processes and their reactions are discussed below.

Carbon dioxide:

In case of plants the carbon dioxide is needed to produce glucose in the process of photosynthesis. This step is very crucial for the survival of each and every organisms in the living world. The energy for this process of photosynthesis is found from sun's rays.

In case of humans, carbon dioxide is produced through respiration. This produces energy that helps the organism to sustain living.

Oxygen:

It is produced by plants from photosynthesis through splitting of water. The energy for this process comes from Sun's energy.

In case of animals, the oxygen is needed  for respiration. This is required to accept the electron in the last step of aerobic respiration. This produces the energy that helps to sustain the living.

Water:

Both plants and animals require the water for performing their metabolic works. The water is obtained by plants from soil through roots and conducted to leaves by vascular tissues xylem. Similarly the animals obtain water from drinking. They need the water to perform digestion, and each and every metabolic process.

Glucose:

Glucose is produced by plants from photosynthesis. It is produced absorbing the energy of Sun's rays.

In case of animals, the animals obtain glucose from food and they digest the glucose through respiration and produce energy that helps them to sustain life.