blue-green algae
euglena
fern
maize
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Pteridophytes are also called 👉 Ferns , so they show alternation of generations
The question is asking about something called alternation of as*xual and s*xual reproduction. That phrase sounds heavy, but it is actually describing a life cycle where an organism switches between two modes of reproduction. One stage produces offspring without s*x, and another stage involves s*xual reproduction where male and female cells combine.
So imagine a cycle. One generation makes copies of itself without needing a partner. Then the next generation produces s*x cells that fuse and create variation. That back and forth is what they mean.
Now the key point in your question is this. Not all organisms do this. Only a few plant groups are famous for it, and that is where your answer hides.
The correct answer is fern.
Let me show you why in a way that sticks in your head.
A fern has two clear stages in its life cycle. One stage is the sporophyte stage. This is the big leafy fern you see in the forest or on pictures. This stage produces spores, and spores are a form of as*xual reproduction because they do not involve fusion of male and female cells. Those spores grow into a second stage called the gametophyte. This second stage is small and usually unnoticed. It produces male and female cells, and those cells join together during fertilization. That is s*xual reproduction. After fertilization, a new sporophyte grows again, and the cycle continues.
So ferns literally alternate between as*xual and s*xual reproduction. That is why they are the classic example JAMB loves.
Now let’s clear the confusion around the other options, because that is usually where students get tricked.
Blue green algae is not correct because it mainly reproduces as*xually. It just splits itself into two through a simple process called binary fission. There is no real s*xual stage where male and female cells combine in a structured cycle like in plants. So it does not alternate between two generations.
Euglena is also incorrect. Euglena is a single-celled organism. It mostly reproduces as*xually by dividing itself. It does not have a complex life cycle with two alternating generations. There is no clear s*xual and as*xual switching system like in ferns.
Maize is also wrong. Maize is a flowering plant, and flowering plants do have s*xual reproduction through seeds. But they do not show a clear alternation of generations in the same obvious way as ferns. In maize, the dominant stage is the plant you see, and the reproductive process is mainly s*xual through flowers, pollination, and seed formation. There is no independent visible as*xual stage alternating with a s*xual one like in ferns.
So if you strip everything down to the core idea, the question is really asking you which organism shows a life cycle that visibly switches between two reproductive phases. Only fern does that clearly in your syllabus.
If you were unsure before, I want you to notice something now. JAMB loves patterns. Anytime you see “alternation of generations,” your brain should immediately lean toward ferns or sometimes mosses. That is the identity clue.
So the final answer is C, fern.
