NUTRITION IN PLANTS

CLASS – VII

SUBJECT - SCIENCE

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THE VARIOUS COMPONENTS PRESENT IN FOOD ARE CALLED NUTRIENTS.

THE UPTAKE OF NUTRIENTS IN FOOD AND ITS UTILISATION BY THE BODY IS CALLED NUTRITION.

THERE ARE TWO MODES OF NUTRITION:

-AUTOTROPHIC

-HETEROTROPHIC

THE MODE OF NUTRITION IN WHICH ORGANISMS MAKE FOOD THEMSELVES FROM SIMPLE SUBSTANCES IS CALLED AUTOTROPHIC NUTRITION. E.G. GREEN PLANTS

THE MODE OF NUTRITION IN WHICH ORGANISMS TAKE IN FOOD PREPARED BY PLANTS IS CALLED HETEROTROPHIC NUTRITION. E.G. ANIMALS

FOOD IS ESSENTIAL FOR ALL LIVING ORGANISMS

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

LET`S FIND OUT

HOW DO PLANTS PREPARE THEIR FOOD?

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PLANTS PREPARE THEIR FOOD WITH THE HELP OF CERTAIN RAW MATERIALS.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

WHAT ARE THE RAW MATERIALS NEEDED BY PLANTS TO MAKE FOOD?

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THE PROCESS BY WHICH PLANTS PREPARE THEIR FOOD BY USING THESE RAW MATERIALS IS CALLED PHOTOSYNTHESIS

-WATER

-CARBON DIOXIDE

-SUNLIGHT

-MINERALS

-CHLOROPHYLL

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

WHERE IS THE FOOD MADE IN PLANTS?

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LEAVES ARE ALSO KNOWN AS FOOD FACTORIES OF THE PLANTS.

LEAVES ARE THE PLACES WHERE FOOD IS PREPARED BY PLANTS.

Index slide

• Use these quick links to look at certain parts of the presentation

Introduction (inc. parts of a plant)

Parts of a flower

Pollination

• Use these quick links to look at certain parts of the presentation

Introduction (inc. parts of a plant)

Parts of a flower

Pollination

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

HOW DO THEY TRANSPORT THEM TO LEAVES?

HOW DO PLANTS OBTAIN RAW MATERIALS FROM THE SURROUNDINGS?

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

Water and Minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves.

THEY ARE ABSORBED BY THE ROOTS

WATER AND MINERALS ARE PRESENT IN SOIL.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

THESE PORES TAKE CARBON DIOXIDE PRESENT IN THE ATMOSPHERE.

THERE ARE TINY PORES PRESENT ON THE SUFACE OF LEAVES CALLED STOMATA.

CARBON DIOXIDE IS PRESENT IN AIR(ATMOSPHERE)

THESE PORES ARE SURROUNDED BY GUARD CELLS.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

A SUBSTANCE CALLED CHLOROPHYLL IS PRESENT IN THE LEAVES OF PLANTS.

IT HELPS THE LEAVES TO CAPTURE THE ENERGY OF SUNLIGHT

IT IS A GREEN COLOUR PIGMENT WHICH PROVIDE GREEN COLOUR TO THE LEAVES

PHOTO-SYNTHESIS

LIGHT

TO PREPARE

The process by which plants prepare their food by using raw materials is called PHOTOSYNTHESIS

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DURING PHOTOSYNTHESIS, LEAVES CONTAINING CHLOROPHYLL, IN THE PRESENCE OF SUNLIGHT USE CARBON DIOXIDE AND WATER TO SYNTHESISE CARBOHYDRATES

sugar

light energy

chlorophyll

carbon

dioxide

water

oxygen

THE PROCESS OF PHOTOSYNTHESIS CAN BE REPRESENTED IN AN EQUATION.

During this process, oxygen is also released.

Plants store their food in the form of starch.

There would not be any food. The survival of almost all living organisms directly or indirectly depends upon the food made by the plants.

Life would be impossible on the earth without oxygen.

IMPORTANCE OF PHOTOSYNTHESIS

LET`S SEE A VIDEO TOGETHER�

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

WHY SUN IS CALLED ULTIMATE SOURCE OF ENERGY FOR ALL LIVING ORGANISMS?

TASK

Parts of a flowering plant

CAN PHOTOSYNTHESIS TAKE PLACE IN OTHER PARTS OF THE PLANT?

flower

leaf

stem

roots

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GREEN STEMS AND BRANCHES UNDERGO THE PROCESS OF PHOTOSYNTHESIS BECAUSE THEY CONTAIN CHLOROPHYLL.

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Photosynthesis in Cactus

• Leaves are modified into spines.

• Photosynthesis takes place in green stem because it contains chlorophyll.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

HAVE YOU OBSERVED SOME PLANTS WITH DEEP RED, VIOLET OR BROWN LEAVES?

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Photosynthesis in Different coloured leaves

• These leaves have other colour pigment.

• Chlorophyll is also present in these leaves.

• The other colour pigments are more than the green colour pigment.

• These leaves will conduct photosynthesis because of the presence of chlorophyll..

• That`s why, these leaves do not appear green in colour.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

HAVE YOU OBSERVED SLIMY,GREEN PATCHES IN PONDS OR STAGNANT WATER BODIES?

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Photosynthesis in ALGAE

• Algae are green coloured organisms found in stagnant water.

• They contain chlorophyll.

• Algae conduct photosynthesis because they contain chlorophyll.

Index slide

• Use these quick links to look at certain parts of the presentation

Introduction (inc. parts of a plant)

Parts of a flower

Pollination

Index slide

• Use these quick links to look at certain parts of the presentation

Introduction (inc. parts of a plant)

Parts of a flower

Pollination

What have we learnt today?

Green plants synthesise food for themselves by the process of PHOTOSYNTHESIS.

Chlorophyll, water, carbon dioxide and sunlight are essential requirements for photosynthesis.

Solar energy is absorbed by the chlorophyll present in leaves.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

What have we learnt today?

Complex chemical substances such as carbohydrates are the products of photosynthesis.

Oxygen is produced during photosynthesis.

It is utilised by the living organisms for their survival.

Index slide

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Introduction (inc. parts of a plant)

Parts of a flower

Pollination

What have we learnt today?

Green colour pigment Chlorophyll is present in green parts of the plant.

There are tiny pores called Stomata present on the surface of leaves for exchange of gases.

The food synthesised by the plants is stored as Starch.

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HOME ASSIGNMENT

1. FILL IN THE BLANKS:
1. The food synthesised by the plants is stored as _______.
2. In photosynthesis, solar energy is absorbed by the pigment called _______.
3. During photosynthesis, plants take in _______ and release _______ gas.

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HOME ASSIGNMENT

2) NAME THE PORES THROUGH WHICH LEAVES EXCHANGE GASES.

3) CHOOSE THE CORRECT OPTION FROM THE FOLLOWING:

PLANTS TAKE CARBON DIOXIDE FROM THE ATMOSPHERE MAINLY THROUGH THEIR –

1. Roots
2. Stem
3. Leaf veins
4. Petals

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HOME ASSIGNMENT

4) SHOW WITH THE HELP OF A SKETCH THAT PLANTS ARE THE ULTIMATE SOURCE OF FOOD.

5) GIVE A BRIEF DESCRIPTION OF THE PROCESS OF SYNTHESIS OF FOOD IN GREEN PLANTS.

6) DRAW A WELL LABELLED DIAGRAM OF STOMATA.

THANKYOU

FROM – REKHA CHOUDHARY

T.G.T SCIENCE

K.V VIKASPURI