Waec Biology 2007 Past Questions and Answers

Question 26:

• WAEC 2007

In testing for starch in a leaf, the leaf is boiled in alcohol to

A. Kill the cells
B. Soften the leaf
C. Enable chemicals penetrate the leaf
D. Decolourise the leaf

Question 27:

• WAEC 2007

The mode of nutrition common to green plants is

A. Autotrophic
B. Heterotrophic
C. Holozoic
D. Saprophytic

Question 28:

• WAEC 2007

Micronutrients essential for the synthesis of chlorophyll include

A. Iron and potassium
B. Iron and magnesium
C. Magnesium and calcium
D. Magnesium and potassium

Question 29:

• WAEC 2007

Biuret’s test is carried out on a food substance to indicate the presence of

A. Vitamins B
B. Fats
C. Proteins
D. Starch

Question 30:

• WAEC 2007

In a test for non-reducing sugars like sucrose, what is the significance of adding dilute hydrochloric acid to the original sugar solution? To

A. Hydrolyse the non-reducing sugar
B. Accelerate he rate of the reaction
C. Stabilize the medium
D. Sterilize the solution