JAMB 2010 Biology · Question 41

I. Stomata → Spirogyra II. Alveoli → Earthworm III. Malpighian tubule → Mammal IV. Contractile vacuole →…

Question

I. Stomata → Spirogyra II. Alveoli → Earthworm III. Malpighian tubule → Mammal IV. Contractile vacuole → Protozoa. Which of the above structures is correctly matched with the organisms in which it is found?

A.lll
B.ll
C.l
D.IV

Answer: D. IV

Explanation written with AI and checked against the answer key

Analyze the question: We need to find which structure is correctly paired with the organism where it is found.

Check each pair:

I. Stomata → Spirogyra: Wrong. Spirogyra is a filamentous green alga. It is aquatic and has no stomata. Stomata are found in the leaves and stems of higher plants.
II. Alveoli → Earthworm: Wrong. Alveoli are air sacs in the lungs of mammals. The earthworm breathes through its moist skin and has no lungs.
III. Malpighian tubule → Mammal: Wrong. Malpighian tubules are excretory organs of insects such as the cockroach and grasshopper. Mammals excrete with kidneys.
IV. Contractile vacuole → Protozoa: Correct. Freshwater protozoans such as Amoeba and Paramecium use the contractile vacuole for osmoregulation. It pumps out excess water that enters by osmosis, and it also helps remove some wastes.

Answer: Only IV is correctly matched, so the answer is D.

Exam tip: Memorize the organ-to-organism pairs:

Malpighian tubules → insects
Alveoli → lungs of mammals
Stomata → higher plants
Contractile vacuole → freshwater protozoans

In matching questions like this, eliminate the pairs you know are wrong first. Here that leaves only one option.

AI can make mistakes. Report anything that looks wrong.