Waec Biology Past Questions and Answers

Question 136:

• WAEC 1990

(a) Describe the process of succession in an abandoned farm land.
(b) List seven ways by which micro-organisms can -be controlled to maintain good health.

Question 137:

• WAEC 1991

The cell is a functional unit of living organisms because

A. Multicellular organisms are made up of cells
B. All cells in a multicellular organism function as a single cell
C. The function of a multicellular organism is the sum total of the functions of its constituent cells
D. The function of a single cell is superior to that of the multicellular organism
E. The cells of a multicelullar organism are similar in structure

Question 138:

• WAEC 1991

The cell is a functional unit of living organisms because

A. Multicellular organisms are made up of cells
B. All cells in a multicellular organism function as a single cell
C. The function of a multicellular organism is the sum total of the functions of its constituent cells
D. The function of a single cell is superior to that of the multicellular organism
E. The cells of a multicelullar organism are similar in structure

Question 139:

• WAEC 1991

The organelle which eliminate water from the body of protozoa is

A. Plasma membrane
B. Contractile vacuole
C. Cell wall
D. Protoplasm
E. Nucleus

Question 140:

• WAEC 1991

Spirogyra is regarded as a multicellular plant because

A. Its cells are linked together by cytoplasmic strands
B. Its cells are joined to form organs
C. The cylindrical cells are linked end to end
D. The filaments consist of one cell only
E. It is an algea containing large vacuoles