* Air is all around
* Our earth is
surrounded by a huge envelope of air called the atmosphere.
* The process of
burning of a substance in the presence of oxygen and releasing a large amount of
light and heat is called combustion.
* Priestley helped
us in understanding the presence of oxygen in air that is produced by plants
during photosynthesis which can be used by animals for respiration.
experiment helped us to know the role of sunlight in evolving Oxygen during
* Air contains 78%
Nitrogen, 21% Oxygen, 1% of carbon-di-oxide, water vapour, Noble gases, and
* Composition of
air changes slightly from place to place and also from season to season.
* In plants,
+water ---- Sunlight Chlorophyll→ Food + Oxygen Chlorophyll
* In animals,
+ Oxygen → Carbon - di - oxide + water +
* Aquatic plants
and animals use oxygen dissolved in water for breathing.
* Ozone layer,
present in the atmosphere helps in preventing harmful radiations hitting the
this activity you will be able to understand the atomic level of the process
that plants use to convert solar energy into chemical energy.
Step 1: Use the given URL in the browser. ‘Illuminating
Photosynthesis page will open.
Step 2: Three buttons given on the top of the activity
window to explore. Click the 'The Cycle' button, in this window you can open
the curtain and water the plant by click on the curtain and the watering pot.
Step 3: Explore the atomic level process of the
photosynthesis by clicking the 'Atomic Shuffle' button.
Step 4: Click 'Replay" to view the process again
and 'Next' to view the next level of the process.