The precise mechanisms by which star collapse brought about life are still unknown, but life basically consists of molecular machines that seek to create more of themselves.


The word photosynthesis can be separated to make two smaller words:

“photo” which means light

“synthesis” which means putting together

Plants need food but they do not have to wait on people or animals to provide for them. Most plants are able to make their own food whenever they need it. This is done using light and the process is called photosynthesis.

Photosynthesis is the process by which plants make their own food.

  • Carbon dioxide from the air passes through small pores (holes) in the leaves. These pores are called stomata.
  • Water is absorbed by the roots and passes through vessels in the stem on its way to the leaves.
  • Sunlight is absorbed by a green chemical in the leaves.

Photosynthesis takes place in the leaves of plants. The leaves are made up of very small cells. Inside these cells are tiny structures called chloroplasts. Each chloroplast contains a green chemical called chlorophyll which gives leaves their green color.

Some of the glucose is used to provide energy for the growth and development of plants while the rest is stored in leaves, roots or fruits for later use by plants.

Light dependent reactions occur in the thylakoid membrane of the chloroplasts and take place only when light is available.

Plants need carbon dioxide, water and sunlight to make their food. The food they make is called glucose. In addition to glucose, plants also produce oxygen.

The equation is 6CO2+6H2OC6H12O6+O6 it shows the chemical formula for carbon dioxide, water, glucose and oxygen

Some of the glucose that plants produce during photosynthesis is stored in fruits and roots. This is why we are able to eat carrots, potatoes, apples, water melons and all the others. These foods provide energy for humans and animals.

Oxygen that is produced during photosynthesis is released into the atmosphere. This oxygen is what we breathe and we cannot live without it.

While it is important that photosynthesis provides food and oxygen, its impact on our daily lives is far more extensive. Photosynthesis is so essential to life on earth that most living organisms, including humans, cannot survive without it.

All of our energy for growth, development and physical activity comes from eating food from plants and animals. Animals obtain energy from eating plants. Plants obtain energy from glucose made during photosynthesis.

Our major sources of energy such as natural gas, coal and oil were made millions of years ago from the remains of dead plants and animals which we already know got their energy from photosynthesis.

Photosynthesis is also responsible for balancing oxygen and carbon dioxide levels in the atmosphere. Plants absorb carbon dioxide from the air and release oxygen during the process of photosynthesis.