Saturday, October 10, 2009 ; Plant Transport System
Michelle asked about the Plant Transport System which she has missed a few lessons in due to illness.
Xylem = water-carrying tube
Phloem = food-carrying tube
As seen in the diagram on cross-section of a stem below, food-carrying tube is on the outside (nearer to the stem surface) while water-carrying tube is more interior.
When a layer of the stem is cut off, usually the food-carrying tube is removed (common question in plants transport system). This will prevent food from the leaves above the cut area from transporting food to parts of the plants below the cut area.
If a thicker layer of the stem is cut off, water-carrying tubes will be cut off. This will prevent leaves from receiving water to make food and therefore, the plant will soon wither and die as there is no food made for respiration.
It is important to note that food-carrying tubes carry food to all parts of the plant from the leaves.
On question 32c in your Science Practice 2B, my clue is "What is the function of leaves? If they're gone, what will happen?" and ignore the blue water. It got nothing to do with 32c anymore.
Let me know which other areas you're not familiar with.
posted by Allan at
3:04 PM
0 Comments:
Post a Comment
Subscribe to Post Comments [Atom]
<< Home