Waec Biology 2003 Past Questions and Answers

Question 41:

• WAEC 2003

Which of the following is not a behavioural adaptation used by social animals?

A. Cryptic
B. Mimicry
C. Flash
D. Season

Question 42:

• WAEC 2003

In natural selection, Darwin proposed that evolution occurred because of the following conditions except

A. Food and other needs are abundant
B. There is a fierce competition among the offsprings
C. That the weaker offsprings are eliminated
D. That nature selects those that will survive to reproduce their kind

Question 43:

• WAEC 2003

(a) What is a balanced diet?
(b) (i) Name four classes of food other than proteins
(ii) Give one example of food substance for each class named
(c)(i) State three functions of proteins in humans.
(ii) Describe the appearance of a child with protein deficiency.
(d)(i) Name one organelle in a living cell that produces enzymes.
(ii) Mention two enzymes that act on proteins.

Question 44:

• WAEC 2003

(a) Describe the processes that occur from the time a pollen grain is deposited on the stigma of a flower to the . formation of a zygote.
(b) Explain the importance of the amniotic sac to the mammalian embryo.
(c) The following are the names of some common diseases; malaria, typhoid, amoeboid dysentry, tuberculosis, tetanus, leprosy, cholera, yellow fever, poliomyelitis, measles, common cold, small pox, influenza, chicken pox, whooping cough and trypanosomiasis. Use the format below to classify the diseases according to their causative organisms.

Viral diseases	Bacteria diseases	Protozoa diseases

Question 45:

• WAEC 2003

(a)(i) What is respiration?
(ii) Name two types of respiration.
(iii) Write in words the equation representing the type of respiration that occurs in the muscle during strenuous exercise.
(b) Name two diseases that can affect the above mentioned system.
(c) Mention the structures used for gaseous exchange in the following organisms:
(i) Amoeba
(ii) Cockroach
(iii) White mangrove
(iv) Hibiscus.