The Root System
The entire lower part of growing plants that is normally under the soil makes up the root system. Roots are branching organs which grow vertically into the soil. Roots have no leaves, nodes or buds.
In general, the plant root system consists of a taproot (primary root) or fibrous roots (adventitious roots), with attached branch roots and finer rootlets having root hairs close to the tip.
Functions of Roots.
Despite being inconspicuous because they are normally hidden underground, the plant root system performs various functions which are essential to growth and development. Some of these functions include:-
1. Anchorage and support
2. Absorption
3. Storage
4. Photosynthesis
5. Movement
6. Reproduction
Read the following which explains each of the above.
There are different types of root system. Some of these include
(a) tap root
(b) fibrous root .
Examine these images of root types. More information on roots for your readings.
THE SHOOT SYSTEM
All the parts that you see growing above the ground are the organs that together make up the shoot system. Some of these organs include leaves, stems, buds, flowers, etc.
Wednesday, January 2, 2013
Friday, July 20, 2012
GLOBAL WARMING
What is global warming?
Global warming refers to the environmental condition resulting from Earth retaining too much heat .
Gases such as carbon dioxide, trap heat, and and these gases are being released or sent into the atmosphere at a rapid or alarming rate. As a result of this, the balance of gases in the air is destroyed.
Excess carbon dioxide, which is a hot gas, comes from the fumes generated or given off by factories and motor vehicles.
The destruction of forests for lumber or other uses for mankind, is also a contributing factor to global warming. People sometimes use the 'slash and burn' method to destroy trees. A large amount of carbon dioxide is released into earth's atmosphere when this is done.
Trees supply us with oxygen, and take in carbon dioxide. Therefore, the fewer the trees that are left behind, the less oxygen will be produced.
Read this folder which will help you to understand more about global warming, then take the quiz that follows.
Global warming refers to the environmental condition resulting from Earth retaining too much heat .
Gases such as carbon dioxide, trap heat, and and these gases are being released or sent into the atmosphere at a rapid or alarming rate. As a result of this, the balance of gases in the air is destroyed.
Excess carbon dioxide, which is a hot gas, comes from the fumes generated or given off by factories and motor vehicles.
The destruction of forests for lumber or other uses for mankind, is also a contributing factor to global warming. People sometimes use the 'slash and burn' method to destroy trees. A large amount of carbon dioxide is released into earth's atmosphere when this is done.
Trees supply us with oxygen, and take in carbon dioxide. Therefore, the fewer the trees that are left behind, the less oxygen will be produced.
Read this folder which will help you to understand more about global warming, then take the quiz that follows.
Sunday, October 30, 2011
Friday, October 14, 2011
Lines of latitude and longitude
The main line of latitude is the equator and this measures zero degrees. It is the only line of latitude which is a Great Circle. The equator divides the earth into the Northern and Southern Hemispheres.
How materials affect the behaviour of light
Materials affect the behaviour of light in a number of ways.
Take a look at this clip.
Sunday, September 18, 2011
Eclipses
There are two types of eclipses, namely, solar eclipse and lunar eclipse.
Another example of a solar eclipse.
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