NUTRITION IN PLANTS

WHAT DO YOU MEAN BY NUTRITION ? The nutrients enable living organisms to build

their bodies , to grow , to repair their damaged parts of their bodies and provide the energy to carry out life and processes

WHAT DO YOU MEAN BY PHOTOSYNTHESIS ? The energy is used to synthesis (prepare) food from carbon dioxide and water since the synthesis of food occurs in the presence of sunlight

Carbon dioxide

oxygen

Chlorophyll in leaves

water and minerals

Light e

nergy

Diagram showing photosynthesis

Water and minerals are transported to the leaves by vessels which run like the pipes through out the root , the stem , the branches and the leaves

photosynthesis

Water + light=chemical energy

1 Chlorophyll traps light

energy

2 Water enters leaf

3 Carbon dioxide enters leaf

Light energy

Carbon dioxide from air is taken from in through the tiny pores present on the surface of the leaves these tiny pores are surrounded by guard sells such pores are called stomataStomatal

complex Accessory cells

Guard cellpore

Cellulose micro fibril

During the process oxygen is released . The carbohydrates ultimately get converted into starch . The presence of starch in leaves indicates the occurrence of photosynthesis

Blue / colour in areas exposed to

light

Yellow / brown colour in areas not

exposed to light

WHAT DO YOU MEAN BY ALGAE ? They contain chlorophyll which

gives them the green colour these are generally formed the growth of organisms called algae algae can prepare their own food by photosynthesis Algae growing on

leaf

OTHER MODE OF NUTRITION IN PLANTS There are some other plants which do

not have chlorophyll

then how do they survive ?

Like human and animal such plants depend on the food produced by other plants . They use heterotrophic mode.

You see yellow tubular structure twining around the stem and branches . This plants are called cuscuta . It does not have chlorophyll

Have you seen or heard of plants that can eat animals?

There are few plants which can trap insect and digest them such insect eating plant are called insectivorous plants

ex : pitcher plant

Inside the pitcher plant there are hair which directed downward . When an insect lands the pitcher plants , the lid closes and the trapped insect gets entangled into hair. The insect is digested by the digestive juices secreted in the pitcher

SAPROTROPS The mode of nutrition which

organisms take nutrition in solution form from dead and decaying matter is called saptrotopic nutrition.

Fungus on mushroom

Fungi growing on bread

HOW NUTRITION ARE REPLENISHED IN THE SOIL You learnt plant absorb minerals

nutrients from soil . Plants contain nutrients such as nitrogen , potassium , phosphorous , etc these nutrients need to be added from time to time to enrich the soil . We can grow plants and keep them healthy .

WHAT WE HAVE LEARNT All organisms take food and utilize it to

get energy for the growth and maintance of their body.

Green plants synthesis their food themselves by the process of photosynthesis .they are called autotrophs.

Solar energy is stored in the form of food in leaves with the help of chlorophyll.

A few plants and all animals are dependent on others for their nutrition and called hetrotrophs

QUIZ TIME Nutrition is to repair their damaged parts of their bodies and provide the ……..

energy

life

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Plants take food in ………..

day

night

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Plants who eat insect are called ……….

Hetrotrophs

Autotrophs

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Solar energy is stored in the form of food in the leaves with the help of …………..

Guard sell

chlorophyll

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Well done

MADE BY

Mohamed Thoufeeq……………vii-B

Gilbert Wilson…………………….vii-B

Thank you

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