WAEC Biology 2023 Objective — Question 6

Question 6 of 50 from the West African Examinations Council (WAEC) Biology 2023 Objective paper, with the correct answer and a full explanation.

Study the list of organisms below and use them to answer questions 6 and 7. I - Hydra II - Owl III - Snake IV - Snail 6. Arrangement of the organisms in order of increasing complexity is

A. I - II - III - IV
B. II - III - I - IV
C. I - IV - III - IICorrect
D. IV - III - II - I

Explanation

Since hydra and snail are invertebrates, they are less complex than snake and owl. Also, molluscans (e.g. snail) are more advanced than coelenterates (e.g. hydra). For vertebrates, the evolutionary trend is Pisces→Amphibians→Reptiles→Aves→Mammals; owl (a bird) is more advanced than snake (a reptile). Thus, in order of increasing complexity: I→IV→III→II.

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Biology 2023 Objective More Biology past papers