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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    6 Topics
    |
    1 Quiz
  2. Recognizing Living Things | Week 2
    3 Topics
    |
    1 Quiz
  3. Organisation of Life | Week 3
    3 Topics
  4. Classification of Living Organisms | Week 4
    7 Topics
    |
    1 Quiz
  5. Kingdom Prokaryotae / Monera & Kingdom Protista | Week 5
    3 Topics
    |
    3 Quizzes
  6. Kingdom Fungi & Kingdom Plantae | Week 6
    9 Topics
    |
    2 Quizzes
  7. Kingdom Animalia I | Week 7
    6 Topics
    |
    1 Quiz
  8. Kingdom Animalia II | Week 8
    5 Topics
    |
    1 Quiz
  9. The Cell | Week 9
    3 Topics
    |
    1 Quiz
  10. The Cell Structure and Functions | Week 10
    4 Topics
    |
    1 Quiz
  11. The Cell and its Environment | Week 11
    4 Topics
    |
    1 Quiz
  12. Nutrition in Plants | Week 12
    4 Topics
    |
    1 Quiz



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Pteridophytes, commonly called ferns or fern allies, are vascular plants and have leaves (known as fronds), roots and sometimes true stems.

Pteridophytes are classified into ferns and club mosses.

Habitat: Damp terrestrial habitats.

Characteristics of Pteridophyta:

1. They have a vascular system for the conduction of water and other substances.

2. They do not bear seeds instead they bear spores.

3. The stem of a fern is a rhizome with long leaves.

4. Fern shows alternation of generation (gametophyte and sporophyte). The mature leaves or fronds of the fern plant (sporophyte stage) bear spores on their underside. The spores mature into young gametophytes which bear the sex organs that contain the eggs and a new sporophyte or document fern plant is produced. Both the sporophyte and gametophyte lead separate existences unlike in the Bryophyte.

5. The sporophyte is dominant in the life cycle of ferns.

6. It possesses large leaves called fronds, true stems & roots.

7. Each gametophyte is called prothallus (which is green and photosynthetic.)

fern
Fern.

Classification of Pteridophytes:

There are four classes, namely:

  • Psilopsida
  • Lycopsida
  • Sphenopsida
  • Pteropsida

Class Lycopsida (Club Mosses)

Habitat: Lycophytes (club mosses) are found almost everywhere on Earth, excluding Antarctica. They grow from the tropics to the Arctic in a range of ecosystems including rainforests, deserts, lakes and wetlands. A large proportion of lycophytes grow from the stems of trees and other plants.

Characteristics:

1. These are the first plants to develop a vascular system.

2. They bear leaves called microphyIIs.

3. They possess special cone-like strobilus made up of special leaves called sporophylls arranged closely together. (A sporophyll is a leaf that produces spores.)

4. The sporophyIIs bear sporangia.

5. The sporophytes grow on independent gametophytes.

Lycophyta 2 Easy Resize.com 1
Lycophyta.

Difference between Bryophyta & Pleridophyta:

Character:Bryophyta:Pteridophyta:
Vasculature
tissue
Vascular tissue
is absent.
Body is differentiated into
tissue organs and systems.
i.e. Vascular tissue is present. 
Vasculature
system
They are non-vascular
plants.
They are vascular plants.
Stems
or leaves
No true roots, leaves
and stems.
Have roots,
stems and leaves.
Sporophytic
phase

The sporophyte is dependent
on gametophyte on the
alternation of generation.
The two generations are
independent of each other.
Dominating
part
Gametophyte generation
is dominant.
The sporophyte generation
is more dominant.
ExamplesMosses, liverworts,
hornworts.
Clubmosses, ferns.

Alternation of Generation:

In alternation of generation, the sporophyte is always attached to the gametophyte in bryophytes but on pteridophytes, they lead separate lives. The gametophyte produces motile (moving) male gametes and non-motile (non-moving) female gametes. Water is essential for fertilization. The fertilized egg or zygote grows on the gametophyte (Bryophyte) into a sporophyte which produces spores. These spores are dispersed by wind and when they fall in a suitable moist environment, they develop into gametophytes.

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