Waec Biology 1989 Past Questions and Answers

Question 66:

• WAEC 1989

The theory that new organs or characteristics develop in organisms when there is a need for them was
postulated by

A. Charles Darwin
B. Jean Lamarck
C. Gregor Mendel
D. Wallace
E. Louis Pasteur

Question 67:

• WAEC 1989

Which of the following is an example of reproductive adaptation?

A. Succulent stems of cactus plant
B. Changing colour of chameleon
C. Possession of spines by desert plants
D. Neck colouration in Agama lizard
E. Leaf-shedding in trees

Question 68:

• WAEC 1989

The large intercellular air spaces which penetrate the tissues of most hyrophytes provide a pathway through
which

A. Carbondioxide absorbed by leaves can diffuse to the roots
B. Oxygen produced in the leaves can diffuse to the submerged parts
C. Salts absorbed by roots can reach other parts of the plant
D. Plant hormones are transported to various parts
E. Manufactured food is translocated

Question 69:

• WAEC 1989

Which of the following processes will not introduce carbondioxide into the atmosphere?

A. Breathing
B. Photosynthesis
C. Respiration
D. Putrefaction
E. Burning

Question 70:

• WAEC 1989

(a) List five morphological features that are characteristic of plant found in each of the following habitats:-(i) tropical rainforest. (ii) savanna. In each case, state function of the features listed in (a) to the plant.
(b) Explain the term: ecological succession
(c) By means of a diagram only, outline the carbon cycle to show the relative importance of the cycle to life in general.