JAMB 2021 Biology · Question 8

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.II
B.I
C.IV
D.III

Answer: C. 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 has no stomata because it is aquatic and exchanges gases over its whole surface. Stomata occur in higher plants (leaves and stems).
II. Alveoli → Earthworm: Wrong. Alveoli are the air sacs of the lungs in mammals and other lung-breathing vertebrates. The earthworm breathes through its moist skin.
III. Malpighian tubule → Mammal: Wrong. Malpighian tubules are the excretory organs of insects (e.g., cockroach, grasshopper). Mammals excrete through the kidneys (nephrons).
IV. Contractile vacuole → Protozoa: Correct. Freshwater protozoa such as Amoeba and Paramecium have contractile vacuoles. They collect excess water that enters by osmosis and expel it, which is osmoregulation and a little excretion.

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

Tip: Memorize the right homes for these structures:

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

In matching questions, eliminate options by spotting the obvious mismatches first. Here, "Malpighian tubule" should immediately make you think "insect", not mammal.

AI can make mistakes. Report anything that looks wrong.