1.tissue is involved in transportation of food in plants.
2 In the heart, which chambers have thicker walls the auricles or the ventricles?
3
tissue is involved in transportation of water in plants.
4 The colour of the red blood cells is due to the pigment
5. The upper two chambers of the heart are
and the lower ones are
6. Name the blood vessels which carry blood towards the heart
7 The stretching and relaxing of arteries with each heartbeat is felt as thropbbing. What is it
called?
8. In lower animals, excretion occurs by
from the body surface.
9. If someone's kidneys are damaged, doctors remove wastes from the body by
Answers
Explanation:
Plants have two transport systems - xylem and phloem. Xylem transports water and minerals. Phloem transports sugars and amino acids dissolved in water.
Xylem
The xylem transports water and minerals from the roots up the plant stem and into the leaves.
In a mature flowering plant or tree, most of the cells that make up the xylem are specialised cells called vessels. Vessels:
Lose their end walls so the xylem forms a continuous, hollow tube. This allows water to flow easily.
Become strengthened by a chemical called lignin. The cells are no longer alive. Lignin gives strength and support to the vessel.
Transport in the xylem is a physical process. It does not require energy.
1. Phloem Tissue.
2. Ventricles.
3. Xylem Tissue.
4. Haemoglobin.
5. Upper chambers - The right and left Atria
Lower chambers - The right and left Ventricles
6. Artries and Veins
7. Pulse
8. Diffusion
9. Dialysis