Biology 2012 Waec Past Questions and Answers

Question 26 :

• WAEC 2012

Squirrels easily kill some trees because

A. They inject poisonous substances into the trees.
B. Most trees are susceptible to squirrel bites
C. They feed voraciously on the roots
D. They gnaw the bark and destroy

Question 27 :

• WAEC 2012

The major role played by accessory pigments during photosynthesis is
the phloem.
to

A. Add colour to plants but not to trap light energy
B. Trap light energy that chlorophyll cannot absorb
C. Transfer energy from chlorophyll to other pigments
D. Prevent chlorophyll from absorbing unnecessary light

Question 28 :

• WAEC 2012

The main raw materials required for photosynthesis are

A. Oxygen and water
B. Oxygen and carbon dioxide.
C. Oxygen and chlorophyll
D. Carbon dioxide and water

Question 29 :

• WAEC 2012

What is the benefit of thunder and lightning to farmers?

A. Addition of nitrates to the soil
B. Aeration of the soil
C. Removal of harmful bacteria from the soil
D. Addition of rain water to the soil

Question 30 :

• WAEC 2012

Which of the following substances must be present in the soil for growth of a healthy green plant?

A. Amino acids
B. Carbon
C. Glucose salts
D. Magnesium ions