7th Class Science Nutrition in Plants

Nutrition in Plants

Category : 7th Class

Nutrition in Plants

 

Synopsis

 

  • Green plants, synthesise their food themselves by the process of photosynthesis. They are autotrophs. Non-green plants and animals are heterotrophs.

 

  • Photosynthesis can be summarised as follows.

 

\[\text{carbon}\,\text{dioxide+}\,\text{water}\xrightarrow[\text{Chlorophyll}]{\text{Sunlight}}\text{Glucose+Oxygen}\]

 

  • Photosynthesis provide food and oxygen to all the living organisms.

 

  • The Sun is the ultimate source of energy for all living organisms.

 

  • Gaseous exchange in the leaves takes place through tiny pores, which are generally located on the lower surface of a leaf called stomata.

 

  • In some plants like crotons, the green colour of the chlorophyll is hidden by other pigments and appear dark red.

 

  • Some plants like pitcher plant and venus fly trap, feed on trapped insects and fulfill their nitrogen requirement. They are called insectivorous plants.

 

  • The organisms which feed on dead and decaying organisms are called saprophytes. e.g., moulds, mushrooms and some bacteria.

 

  • Plants which depend completely on other plant for food and habitat are called parasites. e.g., cuscuta.

 

  • Some plants, like mistle toe, depend on other plant as well as prepare their own food. They are called partial parasites.

 

  • Symbiosis is a beneficial relationship between two organisms.

 

Other Topics

Notes - Nutrition in Plants
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