Transcript Document

Let us go to the World of
PLANTS
and
their
S.K.Arora
TARGET STUDENTS
11 to 14 Years
Class VII th to IX th
S.K.A.
We have about
25000
Different Species of
Plants
For Example
S.K.A.
Big Trees
Plants of Tea family
Small Bryophytes
Centuary
Plant
Intertidal Plants
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.
8
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 PHYLOGENICRELATIONSHIPS
1.HERBS:-- They have short and perishable stem.
For example: wheat,gram,pea,sun flower
carrot,radish etc.
Go back
Shrubs:-•They are small woody plants of nearly equal
•Their height varies from 1 fit to 4 fit.
• Examples:China rose,Oleander etc.
height
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
12
1.Annuals
2.Biennials
3.Perennials
GO
BACK
ANNUALS
•These plants live and complete their lifecycle 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.
17
•This relationship is based on
Evolutionary links
18
•Whether they produce seeds or not
•Whether the seeds are contained in
fruits or are exposed.
18
• On this basis, all plants are grouped
into two Phyla(Phylum) :--
•CRYPTOGAMES
They do not produce flowers.
•PHANEROGAMES
They produce flowers.
Go to 21
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
Go back
19
CRYPTOGAMES
Thallophyta
Bryophyta
Pteridophyta