RRB NTPC Exam 2016 will test you on Photosynthesis – the single most important chemical reaction on our planet.
RRB NTPC Exam 2016 #Daily Infographic on General Science (Biology)
Photosynthesis is the process by which plants make their own food.
To make food plants need:
- carbon dioxide
Let’s take a look at how these are collected by plants.
- 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.
The Process of Photosynthesis
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.
- Chlorophyll absorbs the sun’s energy.
- It is this energy that is used to split the water molecules into hydrogen and oxygen.
- Oxygen is released from the leaves into the atmosphere
- Hydrogen and carbon dioxide are used to form glucose or food for plants.
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.
Photosynthesis occurs in two stages commonly known as Light dependent Reactions and Light independent Reactions.
The process of Photosynthesis can be summarized by the following equation :
CO2 + H20 = C6H12O6 + O2
In simpler terms :
Carbon Dioxide+Water= Glucose+ Oxygen
TAKE THE QUIZ ON PHOTOSYNTHESIS