# Power and Roots

Document Sample

```					                                    Power and Roots

Power and Roots
The Root is the organ of a plant that typically lies below the surface of the soil. This is not always the
case, however, since a root can also be aerial (growing above the ground) or aerating (growing up
above the ground or especially above water). Furthermore, a stem normally occurring below ground is
not exceptional either (see rhizome). So, it is better to define root as a part of a plant body that bears no
leaves, and therefore also lacks nodes. There are also important internal structural differences between
stems and roots.

The first root that comes from a plant is called the radicle. The four major functions of roots are 1)
absorption of water and inorganic nutrients, 2) anchoring of the plant body to the ground, and
supporting it, 3) storage of food and nutrients, 4) vegetative reproduction. In response to the
concentration of nutrients, roots also synthesise cytokinin, which acts as a signal as to how fast the
shoots can grow. Roots often function in storage of food and nutrients. The roots of most vascular plant
species enter into symbiosis with certain fungi to form mycorrhizas, and a large range of other
organisms including bacteria also closely associate with roots. When dissected, the arrangement of the
cells in a root is root hair, epidermis, epiblem, cortex, endodermis, pericycle and lastly the vascular
tissue in the centre of a root to transport the water absorbed by the root to other places of the plant.

Math.Edurite.com                                                               Page : 1/3
In mathematics, that which is represented by an exponent or index, denoted by a superior numeral. A
number or symbol raised to the power of 2 – that is, multiplied by itself – is said to be squared (for
example, 32, x2), and when raised to the power of 3, it is said to be cubed (for example, 23, y3). Any
number to the power zero always equals 1. Powers can be negative. Negative powers produce fractions,
with the numerator as one, as a number is divided by itself, rather than being multiplied by itself, so for
example 2-1 = 1/2 and 3-3 = 1/27.

Exponents are sometimes referred to as powers and means the number of times the 'base' is being
multiplied. In the study of algebra, exponents are used frequently. In the example to the right, one
would say: Four to the power of 2 or four raised to the second power or four to the second. This would
mean 4 x 4 or (4) (4) or 4 · 4 . Simplified the example would be 16. If the power/exponent of a number
is 1, the number will always equal itself. In other words, in our example if the exponent 2 was a 1,
simplified the example would then be 4.

Exponent Rules :- When working with exponents there are certain rules you'll need to remember.
When you are multiplying terms with the same base you can add the exponents.

This means: 4 x 4 x 4 x 4 x 4 x 4 x 4 or 4 · 4 · 4 · 4 · 4 · 4 · 4
When you are dividing terms with the same base you can subtract the exponents.
This means: 4 x 4 x 4 or 4 · 4 · 4
When parenthesis are involved - you multiply. (83)2 =86
yayb = y (a+b)
yaxa = (yx)a

Squared and Cubed and 0's ;- When you multiply a number by itself it is referred to as being
'squared'. 42 is the same as saying "4 squared" which is equal to 16. If you multiply 4 x 4 x 4 which is
43 it is called 4 cubed. Squaring is raising to the second power, cubing is raising to the third power.
Raising something to a 1 means nothing at all, the base term remains the same. Now for the part that
doesn't seem logical. When you raise a base to the power of 0, it equals 1. Any number raised to the
power 0 equals 1 and 0 raised to any exponent or power is 0!

Math.Edurite.com                                                             Page : 2/3
Thank You

Math.Edurite.Com

```
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
 views: 0 posted: 8/27/2012 language: pages: 3
How are you planning on using Docstoc?