a) Define nutrition. Why is nutrition necessary for an organism? (b) What are the different modes of nutrition? Explain with one example of each mode of nutrition. (c) Name the mode of nutrition in (i) roundworm, and (ii) Plasmodium.

• The process of intake of nutrients like carbohydrates, fats, minerals, vitamins and proteins by an organism and also utilization of these minerals by the organism is called nutrition. Nutrition provides energy to the organism from the food they Each of the above-mentioned nutrients plays a vital role in the functioning of the body. Carbohydrates provide energy to the body, fats provide essential oils to the body, vitamins and minerals play a major role in building the cells and tissues in the body.
• The two different modes of nutrition are Autotrophic nutrition and heterotrophic

Autotrophic nutrition: The mode of nutrition in which the organisms prepare their own food from the available inorganic materials like carbon dioxide, water, sunlight and chlorophyll from their surroundings is called autotrophic nutrition.

Example: Green plants

The mode of nutrition in which the organisms cannot prepare their own food from the available inorganic materials like carbon dioxide, water, sunlight and chlorophyll from their surroundings is called heterotrophic nutrition.

Example: Animals

• The mode of nutrition in roundworm and plasmodium is a parasitic mode of These are the organisms which feed on other living organisms called host for their nutrition.