Waec Biology 1990 Past Questions and Answers

Question 16:

• WAEC 1990

The stems of young herbaceous plants are kept upright mainly by

A. Osmotic pressure
B. Turgor pressure
C. Transpiration pull
D. Suction pressure
E. Root pressure.

Question 17:

• WAEC 1990

Different tissues in plants contribute to the support of the parts as a result of the following characteristics
except

A. Malleability
B. Rigidity
C. Flexibility
D. Resilience
E. Hardness

Question 18:

• WAEC 1990

Water vapour is lost in plants during transpiration through

A. Stomata and lenticels
B. Xylem and stomata
C. Sclerenchyma and stomata
D. Parenchyma and lenticels
E. Guard cells and lenticels

Question 19:

• WAEC 1990

Gaseous exchange takes place in the adult toad through the

A. Buccal cavity, bladder and lungs
B. Buccal cavity, skin and lungs
C. Tympanic membrane, lungs and gills
D. Buccal cavity, skin and spiracle
E. Gills skin and buccal cavity

Question 20:

• WAEC 1990

Breathing movement in mammals is accompanied by regular movements of the diaphragm and the

A. Intercostal muscles
B. Vertebral column
C. Clavicle
D. Pleural cavity
E. Floating ribs