getting to know plants
TRANSCRIPT
Getting to Know Plants
SACHIT
AGGARWAL
HERBS
Plants with green and tender stems are
called Herbs. They are usually short and may not have many branches. They are also used for food,
flavouring, medicine, or perfume.
SHRUBSSome plants have the
stem branching out near the base. The stem is hard
but not very thick. Such plants are called Shrubs.
An area of cultivated shrubs in a park or a garden is known as a
Shrubbery.
TREESSome plants are very tall and have hard and thick brown stem. The stems
have branches in the upper part, much above the ground. Such plants are called Trees. They tend to be long-lived, some reaching several
thousand years old.
CLIMBERS & CREEPERS
Plants that take support on neighbouring
structures and climb up are called Climbers.
Plants with weak
stems that cannot stand
upright and spread on
the ground are called
Creepers.
STEMS
The Stem helps the water and minerals to
go to leaves and
other plant parts attached to the stem,
through narrow tubes inside them.
LEAVESA Leaf is an organ of a plant.The part of a leaf by which it
is attached to the stem is called Petiole. The broad, green part of the leaf is
called Lamina. The lines on the leaf are called Veins and the thick vein in the middle
is called the Midrib. The design made by veins in a
leaf is called the Leaf Venation.
LEAF VENATION
PARALLEL VENATION
In the leaves of grass the veins are parallel to one another.
This is Parallel Venation.
RETICULATE VENATION
If the design is net-like on both sides of midrib, the venation is
Reticulate Venation.
TRANSPIRATION
Water comes out of leaves in the form
of vapour by a process called Transpiration.
Plants release a lot of water into the air
through this process.
PHOTOSYNTHESIS
Leaves prepare their food in
the presence of sunlight and a green coloured substance
present in them. For this, they use water and carbon dioxide from air. This process is called
Photosynthesis. Oxygen is given out in this process. The food
prepared by leaves ultimately gets stored in different parts
of plant as starch.
ROOTS
The Roots help in holding the plant firmly in the soil. They are said to
anchor the plant to the soil.
TYPES OF ROOTS
TAP ROOT In a plant with a taproot
system, the Taproot is the largest, most central, and most
dominant root from which other roots sprout laterally.
FIBROUS ROOTA Fibrous Root system is usually formed by thin,
moderately branching roots growing from the stem.
FLOWERS
A Flower, is the reproductive
structure found in plants. The
prominent parts of the open flower are the Petals. The small
leaf-like structure are called the
Sepals.
PARTS OF A FLOWER
STAMENThe Stamen is the
pollen-producing reproductive organ of a flower.
PISTILThe ovule producing part
of a flower is known as the Pistil.
PARTS OF STAMEN• Anther: The part of the
stamen where pollen is produced.
• Filament: The filament is a stalk that connects to the anther.
PARTS OF PISTIL• Style: It is a long, slender
stalk that connects the stigma and the ovary.
• Stigma: It is a sticky platform at the top of the style where pollen is deposited.
• Ovary :The enlarged basal portion of the pistil where ovules are produced.
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