Plant Bio-Diversity Evs

8/9/2019 Plant Bio-Diversity Evs

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Plant Bio-diversity


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Contents

}}MeaningMeaning}}IntroductionIntroduction}}ClassificationClassification

}}Their Importance inTheir Importance inhuman lifehuman life


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MeaningThe variety we see in

the plants that existon the Earth is known

as Plant Bio-Diversity.


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Plant worldPlant world

Plants are living organisms belonging tothe vegetal kingdom that can live onland or in water.

There are over 300,000 species ofplants, of which more than 250,000produce flowers.

Unlike animals, that need to eatalready processed food , the plantsare able to produce their own foodthrough a chemical process calledphotosynthesis.


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PLANTS

Bryophytes-No

vascular tissue

Tracheophytes-

vascular tissues

are present

SEEDLESS

Reproducevia spores

SEEDED

GYMNOSPERMS-Non flowering

ANGIOSPERMS-

Flowering


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Classification on basis ofClassification on basis of

habitats:habitats:

MESOPHYTES - Mesophytes are the

plants that grow on land and need

moderate amount of water.XEROPHYTES - Xerophytes are the

plants which grow on land and require

very little water.HYDROPHYTES - Hydrophytes are the

plants which float on or grow under

water.


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Some Mesophytes:

Ox - eye daisyClover


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Some Xerophytes:

Euphorbia VirosaBarrel Cactus


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Some Hydrophytes:

Lotus Water Lily


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Classification on the basis oflife cycle:

}Annual plants-They live only for

1 season}Biennial plants-They live for 2

seasons

}Perennial plants-They live for 2or more seasons


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Annual Plants:


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Biennial plants


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Perennial Plants:


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Classification on basis ofmode of nutrition:

}Saprotophs-are Autotrophs areorganisms that are capable ofmaking their own food.

}organisms which obtain nutrientsfrom dead organic matter (thisterm commonly applies to fungi).

}Paraphytes are plants whichfeed on insects


15/29Leaves.......Leaves.......


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Why do leaves have different

shapes ?

Plants grow and maintain themselves

through photosynthesis, the process inwhich leaves collect sunlight to convertwater and carbon dioxide into sugar.Since not all plants are exposed tosunlight in the same way leaves havedifferent shapes that accommodateeach plants individual needs some plants, for e.g. , push their stems upwards ,rising above other plants and competingfor sunlight.


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Thus the Structure of leaves ofplants is always different.

1. Examples of how

leaves may differ Inshape : Holly hastough spiky leaves.Oak trees have softleaves with a wavy

edge. Atlas cedarshave bunches of thinsharp leaves.


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Trees and the difference intheir barks1. A tree is a plant with a thick woody stem

called a trunk.

2. Most trees can grow for 100s of yearssome trees are small but many are tallerthan a house

3. As a tree grows its outer layer becomeshared when they die the form a tough layercalled bark

4. There are different types of barks .5. Look at the rings in a tree stump and count

these to find out the trees age..


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Red pineCedar

Difference in barks of trees


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Zelkova White birch


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Carnivorous plants

The Venus flytrap plant The Pitcher Plant


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Male and female trees Dioecious plants are plants of whichDioecious plants are plants of which

there are both male and female sexes.there are both male and female sexes.

Some dioecious plants include holly,Some dioecious plants include holly,ginkgo, asparagus, dates, mulberry andginkgo, asparagus, dates, mulberry andspinach.spinach. With some trees, such as dateWith some trees, such as datetrees male flowers usually have smalltrees male flowers usually have smallstigmas or maybe no stigmas in themstigmas or maybe no stigmas in themand female trees will be missingand female trees will be missing

stamens.stamens.


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Examples for male and femaletrees:

Mae holly tree Female holly tree


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Test tube plants Growing a plant in a test tube is an artificial

mean of propagation, but the technique

depends on a natural process the capacityto regenerate, or replace, in loss or damagebody pats with new growth first, a smallpiece of plant tissue is isolated in a sterilizedenvironment such ass a test tube the tissue isthen nourished with a suitable growthmedium given the proper condition , anentire plant can be regenerated from a tinybit of tissue, or even from a single cell


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TEST TUBE PLANTS:


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Medicinal plants:

Serpentina Gulvel

Asparagus


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Necessity of plants in human life

Plants maintain the balance in nature

They enable the survival of all species through theinterdependence among living things.

They provide us food

Medicines and herbs can be made out of them

They remove carbon dioxide, release oxygenand purify the air

Raw materials timber, paper, silk can beobtained through them


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Plant Bio-Diversity Evs

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