Question

1. Explain photosynthesis under the following headings:
a. Definition
b. Equation
Necessary conditions
d. Products formed​

Answer 1

$Definition$

Photosynthesis is the biochemical pathway which converts the energy of light into the bonds of glucose molecules.

The process of photosynthesis occurs in two steps.

In the first step, energy from light is stored in the bonds of adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). 

$Equation$

6 CO2 + 6 H2O + Light -> C6H12O6 + 6 O2 + 6 H2O

$Necessary\; conditions$

For plants to perform photosynthesis they require light energy from the sun, water and carbon dioxide. 

Water is absorbed from the soil into the cells of roots.

The water passes from the root system to the xylem vessels in the stem until it reaches the leaves.

$Products \;formed$

The direct products of the light reactions and the Calvin cycle are 3-phosphoglycerate and G3P, two different forms of a 3-carbon sugar molecule.

Two of these molecules combined equals one glucose molecule, the product seen in the photosynthesis equation.

While this is the main food source for plants and animals, these 3-carbon skeletons can be combined into many different forms.

A structural form worth note is cellulose, and extremely strong fibrous material made essentially of strings of glucose.

Besides sugars and sugar-based molecules, oxygen is the other main product of photosynthesis.

Oxygen created from photosynthesis fuels every respiring organism on the planet.