Let us go to the World of

PLANTStheir

S.K.Arora

and

TARGET STUDENTS

11 to 14 Years

Class VII th to IX thS.K.A.

We have about

25000

Different Species of Plants

S.K.A.

For Example

Big Trees Small Bryophytes Intertidal Plants

Plants of Tea family Centuary Plant Cycade Tree

Why to classify

PLANTS

S.K.A.

?

To make studies EASIER

To switch directly to the DESIRED Group

of plants

To ESTABLTSH relationship Among different groups of

Plants

PLANTS

Such as

s.k.a.

1.On the basis of HEIGHT.

2.On the basis of LIFE TIME.

3.On the basis of LEAF SHEDING.

4.On the basis of PHYLOGENIC- RELATIONSHIPS

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1.HERBS:-- They have short and perishable stem. For example: wheat,gram,pea,sun flower carrot,radish etc.

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Shrubs:--

•They are small woody plants of nearly equal height •Their height varies from 1 fit to 4 fit.

• Examples:China rose,Oleander etc.

Trees:--

•They are big,sometime huge woody plants •They have a simple main stem, which grows for some distance above the grounds.

Ex . Neem, Mango etc.

ON THE BASIS OF LIFE TIME

1.Annuals

2.Biennials

3.Perennials

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ANNUALS

•These plants live and complete their life-cycle just in one season.

•Ex.Wheat,Gram,Bean,Pea etc.

Biennials:-- • These plants live for two seasons.

• In the first season they grow leaves and produce

flowers in the next season.

Ex .Beet root;Carrot, Radish(in temperate regions)

Perennials:--•These plants live for more then two years. They produce flowers and seeds every year.

•Ex. Rose, Mango. Pine etc.

•This relationship is based on Evolutionary links

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•Whether they produce seeds or not

•Whether the seeds are contained in

fruits or are exposed.

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• On this basis, all plants are grouped into two Phyla(Phylum) :--

•CRYPTOGAMES

They do not produce flowers.

•PHANEROGAMES

They produce flowers.

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1.DECIDUOUS Plants:-- These plants shed their leaves

once a year.Ex.Mulberry,Oak etc.

2.EVERGREEN Plants :--

These plants never shed their leaves at one time but keep on shedding some leaves all through the year.Ex.Pine,Guava etc

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CRYPTOGAMES

Thallophyta Bryophyta Pteridophyta