What is a Need: - Definition
It is something which is necessary for living organisms to live a
life. From animals to plants, all live in different ways and in
different places.Despite different places and different ways of living,
all of these living organisms have five basic needs.
e) Living Place
Air is a combination of different types of gases used by living
organisms for different requirements. Oxygen and Carbon Dioxide are two
major components of the air. Plants use carbon dioxide to make food and
oxygen. The oxygen is used by humans and other animals to breathe.
The amount may be different but all living beings need water to
survive. For humans and animals ,water helps in digestion and it
fulfills several other needs of the body.Plants take water to make food
and to grow.Certain plants such as algae remain submerged in water and
their survival depends upon water availability.
All plants and animals require nutrients for survival and growth.
Animals and humans eat various types of food to get carbohydrates, fats
and other essential nutrients. Most of the plants make their own food by
taking nutrients from soil and the surrounding environment.
It fulfills different needs of all living organisms.Its energy warms
the whole environment ,thus it acts as a heat source.Plants need
sunlight to make food and oxygen.Humans and animals are dependent on the
sunlight indirectly as they need food from plants.Humans also get
Vitamin D from sunlight ,which gives strength to the bones.
e) Living Place
Some plants need damp places while few grow in drier places.Living
places which are appropriate for certain organisms are called habitats
for those organisms.Every organism need space where they can get enough
food ,air and water for survival.