Nutrition in Animals
All organisms require food for survival and growth.
Requirement of nutrients, mode of intake of food and its utilization in body
are collectively known as nutrition.
Different organism takes food in different ways.
- A humming bird sucks nectar of plants.
- Human
beings use their hands to put food into their mouth and swallow the food
after chewing.
- Infants
of human and many other animals feed upon their mother’s milk by sucking
them.
- A snake
swallows the animals they prey upon without chewing them.
- A frog
captures prey with its sticky tongue.
- An
earthworm uses its muscular pharynx to swallow its food.
- Spiders
weave sticky web in which small insects get stuck.
- Some
aquatic animals filter tiny particles floating nearby and feed upon them.
- Amoeba,
a unicellular animal, engulfs tiny particles of food by using pseudopodia.
Amoeba surrounds the food by pseudopodia and then makes a food vacuole to
engulf the food.
- In multicellular organisms; like hydra there are numerous tentacles around their mouth. Hydra uses tentacles to surround its prey and kill them with its stinging cells. Then the food is pushed inside the body cavity.
Nutrition in complex animals involves following steps:
- Ingestion
- Digestion.
- Absorption.
- Assimilation
- Egestion.
To Know more about the Digestive Human Food Watch the video attached :
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