Life Process

The basic functions performed by living organisms to maintain their life on this earth are called life processes

Life Processes includes: Nutrition Respiration Transportation Excretion Growth

What Are Life Processes

The process of taking in food and utilizing it is

called nutrition. The term ‘nutrition’ comes from the word

‘nutrient’. A nutrient is an organic or inorganic substance

required for the maintenance of life and survival of a living organism.

The food taken in by an organism contains a large number of nutrients like carbohydrates, fats, proteins

Nutrition

Autotrophic 1. Photosynthesis 2. Chemosynthesis Heterotrophic 1. Parasitic 2. Holozoic 3. Saprophytic

Mode of Nutrition

Autotrophic

The word ‘auto’ means ‘self’ and ‘trophe’ means ‘nutrition’.

Autotrophic nutrition is that mode of nutrition in which an organism makes its own food from the simple organic materials like carbon dioxide and water present in the surroundings (with the help of sunlight energy)

Those organisms which can make their own food from carbon dioxide and water are called autotrophs.

Heterotrophic

The word ‘heteros’ means ‘other’ and ‘trophe’ means nutrition, thus heterotrophic means nutrition obtained from others.

All animals have a heterotrophic mode of nutrition. Those organisms which cannot make their own

food from inorganic substance like carbon dioxide and water depend on other organism for their food are called heterotrophs.

They are of 3 types: Parasitic, Holozoic & Saprophytic

Green plant are autotrophs and synthesis their own

food by the process of photosynthesis. ‘Photo’ means light and ‘synthesis’ means build,

thus photosynthesis means ‘build up by light’. The process by which green plants make their own

food from carbon dioxide and water by using sunlight energy in the presence of chlorophyll is called photosynthesis.

Raw material required are carbon dioxide and water.

Oxygen gas is released during photosynthesis.

Nutrition in Plants

Animals obtain their food from plants and

animals thus are heterotrophs. Animals can be divided into three groups on

the basis of their food habits: Herbivores Carnivores Omnivores

Nutrition in Animals

The nutrition in human beings takes place through

human digestive system The human digestive system consists of the

alimentary canal and its associated glands. The various organs of the human digestive system

in sequence: Mouth, Oesophagus, Stomach, Small Intestine, and Large Intestine.

The glands which are associated with the human digestive system and form a part of the human digestive system are: Salivary Glands, Liver, and Pancreas.

Nutrition in Humans

Efforts by: Arpit MathurGurkirat Kaur

Aman Singh