Life Cycle of Fern online exercise for - Free Printable

Let's solve the fill-in-the-blank passage about the life cycle of a fern based on the diagram and biological knowledge.

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Completed Passage with Explanations:

Ferns begin their life cycle with _________.
✔ Spores
👉 Ferns do not produce seeds. Instead, they reproduce via spores, which are reproductive cells that develop into new plants under suitable conditions.

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Ferns produce _________ at the underside of their leaves or fronds.
✔ Spores
👉 The spores are produced in structures called sporangia, located on the undersides of the fronds (leaves).

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Spores are usually clusters inside a ____________.
✔ Sporangium (or spore case)
👉 Spores are grouped together in a structure called a sporangium. When mature, this opens to release the spores.

> Note: "Sporangia" is the plural form; singular is "sporangium".

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When the spore case opens, the spores are released.
✔ This is correct as written — no change needed.

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Spores which find a right place grow into a _________ shaped plants with male and female structures.
✔ Heart-shaped
👉 The spore develops into a small, independent plant called a prothallus, which is typically heart-shaped. It has both male (antheridia) and female (archegonia) reproductive organs.

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Here the fern undergoes _____________.
✔ Fertilization
👉 On the prothallus, sperm from the antheridia swim through water to reach the egg in the archegonium. This process is called fertilization.

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If a male sex cell _________ a female sex cell, the fertilized egg forms a new fern plant.
✔ Fertilizes
👉 The sperm cell fertilizes the egg cell, forming a zygote, which then grows into a new fern plant.

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Spore cases on the fronds produce _________ and the cycle continues.
✔ Spores
👉 The mature fern plant produces more spores in sporangia on its fronds, completing the cycle.

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✔ Final Filled-In Passage:

> Life cycle of a Fern
> Ferns begin their life cycle with spores. Ferns produce spores at the underside of their leaves or fronds. Spores are usually clusters inside a sporangium. When the spore case opens, the spores are released.
>
> Spores which find a right place grow into a heart-shaped plant with male and female structures. Here the fern undergoes fertilization. If a male sex cell fertilizes a female sex cell, the fertilized egg forms a new fern plant. Spore cases on the fronds produce spores and the cycle continues.

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🌿 Summary of the Fern Life Cycle (Based on Diagram):

1. Mature fern plant → produces spores in sporangia on the underside of fronds.
2. Spores are released and land in a moist environment.
3. A spore germinates and grows into a heart-shaped prothallus (gametophyte).
4. The prothallus produces sperm (in antheridia) and eggs (in archegonia).
5. Sperm swims through water to fertilize the egg → forms a zygote.
6. Zygote develops into a new fern plant (sporophyte).
7. The new fern grows and eventually produces spores, continuing the cycle.

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💡 Key Concept: Ferns have a alternation of generations life cycle:
- Sporophyte (diploid): Mature fern plant
- Gametophyte (haploid): Heart-shaped prothallus

This cycle depends on water for sperm to reach the egg.

Let me know if you'd like a labeled version of the diagram!