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Saturday, December 8, 2007



Plants are one of the major kingdoms of living things. Plants are important to us as they provide us with food, clothing, shelter, medicines, even the air we breathe! They also enhance the environment with their beauty and help other living creatures. Thus it is very important we are informed about plants and how we can help them thrive. The study of plants is called botany.




How does photosynthesis occur?
Water is taken in through the roots of the plant and transported to the leaves by the xylem (tubes that carry water) in the stems. Carbon dioxide animals breathe out from the air goes into the leaves through the tiny pores called stomata and is spreads to the cells that contain chlorophyll in the inside layer of the leaf.Sunlight is used to break down the water in the plant into oxygen which the plant gives off and we use to breathe. The hydrogen is then used with the carbon dioxide to create the food for the plants and ultimately food for animals as well.




Roots




Roots' jobs are:
To absorb or take in water and minerals from the ground
To hold the plant in place.
To store food for the plant.
To prevent soil erosion.
There are two inds of root systems. One is the tap root system. In this system there is a main root larger than the other branching roots. The other is the diffuse root system. In this system there are many thin roots with smaller root branching out..
Tap roots are found in most trees and the carrot, parsnip, radish, beet, and dandelion. The grasses such as corn and rye have diffuse roots. Root systems can be far larger the above ground parts of the plant. They tend to grow in length rather than width. The roots contain a cap at their end that is replaced periodically as the root grows through the soil.Within the roots themselves are areas that store food and also tubes called xylem and phloem that take in water and minerals up to the leaves and to bring food manufactured in the leaves back down for nourishment and storage. There are tiny root hairs that maximize the water and minerals that the root can take in or absorb.