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Old Monday, February 27, 2006
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Default Plant Kingdom (Plantae)

(A Brief Discussion at Plant Kingdom)

Virtually all other living creatures depend on plants to survive. Through photosynthesis, plants convert energy from sunlight into food stored as carbohydrates. Because animals cannot get energy directly from the sun, they must eat plants (or other animals that have had a vegetarian meal) to survive. Plants also provide the oxygen humans and animals breathe, because plants use carbon dioxide for photosynthesis and release oxygen into the atmosphere.
Plants are found on land, in oceans, and in fresh water. They have been on Earth for millions of years.
Plants were on Earth before animals and currently number about 260,000 species.

Three features distinguish plants from animals:
• Plants have chlorophyll, a green pigment necessary for photosynthesis;
• Their cell walls are made sturdy by a material called cellulose; and
• They are fixed in one place (they don’t move).


Plant Classification



All plants are included in one so-called kingdom (Kingdom Plantae), which is then broken down into smaller and smaller divisions based on several characteristics, including:
• Whether they can circulate fluids (like rainwater) through their bodies or need to absorb them from the moisture that surrounds them;
• How they reproduce (e.g., by spores or different kinds of seeds); and
• Their size or stature.
The majority of the 260,000 plant species are flowering herbs. To describe all plant species, the following divisions (or phyla) are most commonly used to sort them.

Plants are Devided into Two main Categories:

1) None-Green Plants
&
2) Green Plants..

(1)Non-Green Plants:

they include Bacteria, Fungi, Viruses

(2)Green Plants:

These Plants have Chlorophyll and carry out photosynthesis. They have 2 types further:

...........a) Non-Flowering Plants
...........b) Flowering Plants


(a)Non-Flowering Plants:
They are Seedless Green Plants:

*1* They Produce by Spores
*2* They have Long Life
*3* have simple structure except Ferns
*4* Dont have sporting Fibres
*5* Cannt Grow up in any Greater size.

e.g: Moss , Ferns , Algea

(b)Flowering Plants:

The vast majority of plants (around 230,000) belong to this category.
these plants are seed containing Green Plants

they have further Subtypes:

***************a)Gymnosperms:

These plants have naked and unprotected seeds e,g: Pine,fir,cedar,spruce, cypress.

***************b)Angiosperms:

They have Seeds which are Protected by Fruit or seed-poated.
eg: Grass,Crops,vegetables,Fruits,weed.
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Last edited by Eram Khan; Monday, February 27, 2006 at 05:02 AM.
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