Ch – 1 Nutrition In Plants

Notes:

  • The components of food which are essential for our body are called nutrients.
  • Nutrition is the mode of taking food by an organism and its utilisation by the body.
  • The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic nutrition.
  • The mode of nutrition in which organisms take in ready made food prepared by the plants is called heterotrophic nutrition.
  • The organisms which follow autotrophic mode of nutrition are known as autotrophs.
  • The organisms which follow heterotrophic mode of nutrition are known as heterotrophs.
  • Leaves are known as the food factories of plants.
  • Carbon dioxide from air is taken in through the tiny pores present on the surface of the leaves known as stomata.
  • The green pigment present in the leaves is known as chlorophyll.
  • Chlorophyll helps in capturing sunlight.
  • The desert plants have spine-like leaves to reduce loss of water by transpiration.
  • The carbohydrates are made of carbon, hydrogen and oxygen.
  • Cuscuta takes readymade food from the plant on which it is climbing. The plant on which it climbs is called a host and Cuscuta is called a parasite.
  • The plants which trap insects and digest it by secreting digestive juices are known as insectivorous plants. Eg: Pitcher plant.
  • The mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition.
  • The organisms which live together and share shelter and nutrients have symbiotic relationship. Eg: Lichens.
  • Fertilisers and manures contain plant nutrients like nitrogen, potassium, phosphorous, etc. and it is added from time to time to enrich the soil.
  • Plants use nitrogen in a soluble form.
  • The Rhizobium bacteria take atmospheric nitrogen and convert it into a soluble form.
  • Rhizobium bacteria live in the roots of leguminous plants.

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

10 thoughts on “Ch – 1 Nutrition In Plants

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