Botany: Fern Anatomy and Reproduction

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Questions and Answers

What is the name given to the underground stem of a fern?

  • Frond
  • Rhizome (correct)
  • Stipe
  • Blade

What is a pinna?

  • A primary leaflet of the frond (correct)
  • A division of the pinnulet
  • A division of the pinna
  • The flattened section of the frond

What is the term used to describe the stalk of the frond?

  • Costa
  • Rachis
  • Pinnule
  • Stipe (correct)

What is the name given to the uncurling frond of a fern?

<p>Fiddlehead (D)</p> Signup and view all the answers

What is the primary function of the rachis?

<p>To support the pinnae (D)</p> Signup and view all the answers

What is the term used to describe the leafy part of the frond?

<p>Blade (D)</p> Signup and view all the answers

Which of the following is a characteristic of the roots of a fern?

<p>They are branched (B)</p> Signup and view all the answers

What is the term for the brownish scales that cover the rhizome?

<p>Ramentum (D)</p> Signup and view all the answers

Which of these is NOT a method of vegetative reproduction in Dryopteris repens?

<p>Spore germination (C)</p> Signup and view all the answers

What is the type of spores produced by Dryopteris?

<p>Homosporous (D)</p> Signup and view all the answers

Where are the sporangia of Dryopteris located?

<p>On the lower side of leaves (B)</p> Signup and view all the answers

What is the function of the annulus in the sporangium?

<p>To help in the dehiscence of the sporangium (A)</p> Signup and view all the answers

What happens to the indusium as the spores mature?

<p>It dries up and shrivels (C)</p> Signup and view all the answers

What is the ploidy level of the new sporophyte that develops from the gametophyte in apogamy?

<p>Haploid (A)</p> Signup and view all the answers

What is the shape of the mature gametophyte (prothallus) of Dryopteris?

<p>Heart shaped (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of the prothallus?

<p>Heterotrophic (B)</p> Signup and view all the answers

What does the term 'pteridophyte' refer to?

<p>Feather-like leaf plants (B)</p> Signup and view all the answers

Which characteristic is NOT true about pteridophytes?

<p>They produce flowers. (D)</p> Signup and view all the answers

Which type of leaves do some pteridophytes, like Lycopodium, have?

<p>Microphylls (A)</p> Signup and view all the answers

What structure forms as a result of spore germination in pteridophytes?

<p>Prothallus (D)</p> Signup and view all the answers

Which of the following statements about the reproductive organs of pteridophytes is correct?

<p>The male organs are called antheridia. (C)</p> Signup and view all the answers

What is formed when the antheridium absorbs water and swells?

<p>Antherozoids (D)</p> Signup and view all the answers

Which part of the archegonium contains the egg?

<p>Venter (A)</p> Signup and view all the answers

What substance is secreted from the mouth of the archegonium to attract antherozoids?

<p>Malic acid (B)</p> Signup and view all the answers

What is the initial structure formed from the diploid zygote?

<p>Embryo (C)</p> Signup and view all the answers

In the alternation of generations, which phase is diploid?

<p>Sporophyte (C)</p> Signup and view all the answers

What part of the embryo develops into the root?

<p>Hypobasal cells (C)</p> Signup and view all the answers

How do pteridophytes contribute to the soil ecosystem?

<p>By binding soil along hill slopes (A)</p> Signup and view all the answers

What type of gametes are the antherozoids considered?

<p>Uninucleated and motile (A)</p> Signup and view all the answers

Which pteridophyte is used as a biofertilizer due to its symbiotic relationship?

<p>Azolla (C)</p> Signup and view all the answers

Which of the following is primarily used for polishing metals?

<p>Equisetum (C)</p> Signup and view all the answers

What is the primary use of leaves from Pteridium?

<p>Dye production (B)</p> Signup and view all the answers

Which fern is commonly known as the florist's fern due to its resilience in arrangements?

<p>Ruhmora adiantiformis (C)</p> Signup and view all the answers

Which of the following is NOT considered a benefit of certain pteridophytes?

<p>Noxious weed (D)</p> Signup and view all the answers

Flashcards

Pteridophyte

Plants with feather-like leaves and vascular tissues.

Vascular cryptogams

Pteridophytes without flowers or seeds but with vascular tissues.

Sporophyll

Leaves that bear sporangia to produce spores.

Prothallus

Independent gametophyte structure formed from germinated spores.

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Alternation of generations

Life cycle of pteridophytes that includes sporophyte and gametophyte stages.

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Blade

The flattened section of the frond in a fern.

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Frond

The complete leaf of a fern, including the blade and stalk.

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Pinna

A primary leaflet of a fern leaf.

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Rachis

The stalk within the blade of a fern that supports the pinnae.

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Stipe

The stalk of the frond, connecting the frond to the rhizome.

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Rhizome

The underground stem that supports the fern and produces roots and shoots.

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Pinnule

A smaller division of the pinna in a fern.

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Fiddlehead

An uncurling frond of a fern, often at a young stage.

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Vegetative Reproduction

A type of asexual reproduction in plants where new individuals arise from vegetative parts.

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Fragmentation

A method of vegetative reproduction where a parent plant breaks into fragments that grow into new plants.

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Adventitious Buds

Buds that develop from non-terminal positions on plants, capable of forming new plants.

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Apogamy

Formation of a new sporophyte directly from the gametophyte, resulting in a haploid sporophyte.

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Sporangium

A structure that produces spores in ferns, containing spore mother cells that undergo meiosis.

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Dehiscence of Sporangium

The process where the sporangium splits open to release spores into the environment.

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Germination of Spores

The process by which spores develop into a prothallus after landing on suitable soil.

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Antheridium

The male reproductive structure on the prothallus, producing male gametes (androcytes).

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Scouring Rushes

Equisetum species used for cleaning and polishing utensils.

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Nitrogen Fixation

Symbiotic relationship between Azolla and Anabaena azollae for biofertilization.

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Anthelmintic Drug

A drug obtained from the rhizomes of Dryopteris for treating worm infections.

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Ornamental Ferns

Ferns grown for their aesthetic leaves, like Ruhmora adiantiformis (florist's fern).

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Dry Industrial Lubricant

Club moss spores used as a powder for lubrication and photography.

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Antherozoids

Motile gametes produced by androcytes, enabling fertilization.

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Archegonium

The female reproductive organ producing eggs, typically in clusters.

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Venter

Swollen lower part of the archegonium containing the egg.

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Fertilization

Process where antherozoids swim to and fertilize the ovum, forming a zygote.

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Embryo

Diploid structure formed from a zygote, which develops into a sporophyte.

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Sporocarps

Structures in certain ferns that produce starch and can be eaten.

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Soil Binding

The ability of pteridophytes to stabilize soil on slopes through root systems.

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Study Notes

Pteridophytes Overview

  • Pteridophytes are vascular plants
  • They are the first terrestrial vascular plants
  • Pteridophytes are derived from two Greek words: pteron (meaning feather) and phyton (meaning plant)
  • They have feather-like leaves
  • They occupy a transitional position between bryophytes and spermatophytes
  • They do not produce flowers or seeds (cryptogams)
  • They are vascular cryptogams
  • They have vascular tissues (xylem and phloem)
  • They mostly grow in moist, shady places
  • The main plant body is sporophytic and differentiates into roots, stem and leaves

Characteristics of Pteridophytes

  • They are known as vascular cryptogams
  • They have vascular tissues except xylem vessels and companion cells
  • Some have small leaves (microphylls) exemplified by Lycopodium
  • Others have large leaves (megaphylls) such as Pteris
  • Plants (sporophyte) reproduce by spores formed in sporangia
  • Sporangia develop on the ventral side of leaves or in the axils of leaves
  • Such leaves are called sporophylls
  • Spores can be homosporous or heterosporous

Reproduction in Pteridophytes

  • Sporophylls sometimes form compact structures called cones or strobili
  • Spores germinate to produce a multi-cellular, gametophytic, chlorophyllous body called prothallus
  • Prothallus is a thalloid structure
  • Multicellular, jacketed sex organs are present
  • Male sex organs are called antheridia
  • Female sex organs are called archegonia
  • Water is essential for fertilization as male reproductive units (antherozoids) are motile
  • An embryo develops in situ after fertilization
  • The sporophyte remains attached to the gametophyte until the root develops
  • Plants show clear alternation of generations (sporophyte and gametophyte are independent of each other)

Economic Importance of Pteridophytes

  • Food (ex: Marsilea)
  • Soil binding
  • Scouring (ex: Equisetum)
  • Nitrogen fixation (ex: Azolla)
  • Medicines (ex: roots of Dryopteris)
  • Ornamentals
  • Handicrafts
  • Dye (ex: leaves of Pteridium)
  • Dry industrial lubricant (ex: club mosses)
  • Noxious weeds (ex: Salvinia, Pteridium)

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