Q9 of 27 Page 1

Write three types of blood vessels. Give one important feature of each.

The three types of blood vessels are:

•Artery: Arteries carry oxygen-rich blood away from the heart to all of the body's tissues.


•Vein: Veins carry blood back to the heart. Veins return deoxygenated blood back to the heart after arteries carry blood out. The vena cava is the largest vein in the body.


•Capillary: These are small and thin blood vessels. Capillaries connect arteries and veins. They have thin walls that allow oxygen, nutrients, carbon dioxide, and other waste products to pass to and from cells.


More from this chapter

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7

Identify the acid and base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?

 8

Based on the group valency of elements write the molecular formula of the following compounds giving justification for each:

(i) Oxide of first group elements


(ii) Halide of the elements of group thirteen, and


(iii) Compound formed when an element, A of group 2 combines with an element, B of group seventeen.


 10

Trace the sequence of events which occur when a bright light is focused on your eyes.

 11

What are plant hormones? Name the plant hormones responsible for the following

(i) Growth of stem


(ii) Promotion of cell division


(iii) Inhibition of growth


(iv) Elongation of cells