Waec Biology 2016 Past Questions and Answers

Question 41:

• WAEC 2016

Use the diagram above that shows the effect of nitrates on water bodies Study it carefully and answer questions.
The phenomenon in the diagram is termed

A. Denitrification
B. Conservation
C. Eutrophication
D. Global warming

Question 42:

• WAEC 2016

Use the diagram above that shows the effect of nitrates on water bodies Study it carefully and answer questions.
Another cause that could lead to the phenomenon in the diagram is

A. Exhaust from cars
B. Oil spillage
C. Dumping of sewage
D. Excess rainfall

Question 43:

• WAEC 2016

The illustration above represents a cross between a colour blind male and normal female.
Study it carefully and answer the questions.
What is the genotype ratio of carrier females to normal males in the cross?

A. 1:1
B. 2:3
C. 3:4
D. 4:1

Question 44:

• WAEC 2016

The illustration above represents a cross between a colour blind male and normal female.
Study it carefully and answer the questions.
Which of the genotypes are carriers of colour blindness?

A. 1 and 11 only
B. 1 and 111 only
C. 11 and 111 only
D. 1, 11 and 111 only

Question 45:

• WAEC 2016

The type of placentation illustrated in the diagram above is

A. Marginal
B. Perietal
C. Axile
D. Basal