Question 666:

• JAMB 1990

The vilius in the small intestine is significant because it

A. Increase the surface area for absorption
B. Increase the surface area for digestion
C. Assists in mixing digested food
D. Assists in filtering undigested food

Question 667:

• JAMB 1990

If a ring of bark and phloem is removed from a stem, the

A. Plant dies immediately
B. Plant dies after two days
C. Movement of food is not affected
D. Movement of minerals is hardly affected

Question 668:

• JAMB 1990

Transpiration can be measured with a

A. Photometer
B. Hygrometer
C. Potometer
D. Barometer

Question 669:

• JAMB 1990

Excretory products responsible for the red, purple and blue colours of flowers are called

A. Alkaloid
B. Tannins
C. Anthocyanins
D. Resins

Question 670:

• JAMB 1990

Etiolation is caused by the influence of

A. Minerals salt
B. Water
C. Carbondioxide
D. Light