WAEC Biology Past Questions & Answers - Page 2

6.

Study the list of organisms below and use them to answer the questions.
I-Hydra
II-Owl
III-Snake
IV-Snail

The Phylum of the organism labeled IV is

A.

Platyhelminthes

B.

mollusca

C.

Arthropoda

D.

Coelenterata

Correct answer is B

The organism labelled IV is a Snail. Snails belong to the Phylum Mollusca. This phylum is characterized by soft-bodied animals that usually have an external shell, like snails, clams, and squids.

7.

Study the list of organisms below and use them to answer the questions.
I-Hydra
II-Owl
III-Snake
IV-Snail

The arrangement of the organisms in order of increasing complexity is

A.

II-III-I-IV

B.

I-IV-III - II

C.

I-II-III-IV

D.

IV-III-II - I

Correct answer is B

The arrangement of organisms in order of increasing complexity is Hydra (a simple multicellular organism), Snail (a more complex invertebrate), Snake (a simple vertebrate), and Owl (a more complex vertebrate). This is because as we move from invertebrates to vertebrates, the level of organization and complexity increases. The complexity of an organism can be determined by its level of organization, from cellular to tissue to organ to system level.

8.

The diagram below is an illustration of a structure in the skeletal system of humans. Study it and answer the question.

An individual was involved in a car accident and the illustrated structure was badly injured. Which of the following structures would most likely be affected?

A.

Clavicle, tongue, and pelvis

B.

Eye, cerebellum, and ear

C.

Ear, brain, and hinge joint

D.

Lumbar, eye, and teeth

Correct answer is B

No explanation has been provided for this answer.

9.

The diagram below is an illustration of a structure in the skeletal system of humans. Study it and answer the question

The illustrated structure is a part of the 

A.

appendicular skeleton

B.

axial skeleton

C.

axis vertebrae

D.

cervical vertebrae

Correct answer is B

The skull is part of the axial skeleton. It is the bony structure that forms the head and encloses and protects the brain. The skull is located along the central axis of the body, and it is one of the key components of the axial skeleton.

10.

Which of the following soil types have a high capillarity?

A.

Sand and clay

B.

loam and sand

C.

silt and sand

D.

silt and clay

Correct answer is D

Both silt and clay particles have very small pores, which contribute to higher capillarity. When combined, the silt and clay would likely result in a soil with relatively high capillarity.