Waec Biology 2013 Past Questions and Answers

Question 56:

• WAEC 2013

(a)(i) What is ecological succession?
(ii) Describe the process of ecological succession on a bare plot of land.
(b) Explain the following terms:
(i) biosphere
(ii)population
(iii)community
(iv)ecosystem.
(c) Name one instrument each used for measuring:
(i) relative humidity
(ii) wind speed

Question 57:

• WAEC 2013

(a)(i) What is conservation?
(ii) State six factors responsible for the decline of the abundance and variety of wildlife.
(b) Outline six ways in which the government can improve the situation in (a)(ii) above.
(c)(i) What is Eutrophication?
(ii) State two causes of eutrophication.

Question 58:

• WAEC 2013

(a) Describe the carbon cycle.
(b) State the functions of:
(i) nitrogen fixing bacteria
(ii) nitrifying bacteria
(iii) denitrifying bacteria; in nature.