Table of Contents
What are the characteristics of Sphenopsida?
Sphenopsids are characterized by jointed stems with whorls of leaves and branches borne at the joints (or nodes). The internodal part of the stem is vertically ridged and spores are produced in rings of sporangia arranged in cones, usually at the tips of the fertile shoots.
How many species of Sphenopsida are there?
The Sphenopsida (= Equisetopsida, Arthrophyta), of which the 16 species of Equisetum are the the sole surviving representatives, were represented by diverse herbaceous and woody forms, readily recognised by their characteristic jointed stems, associated with whorled leaves, branches and sporangia-bearing organs and …
What does Sphenopsida mean?
Definition of sphenopsid : any of a class or division (Sphenopsida or Sphenophyta) of primitive vascular plants characterized by jointed ribbed stems, small leaves usually in whorls at distinct stem nodes, and sporangia in sporangiophores and made up of the horsetails and extinct related forms.
What are the classifications of pteridophytes?
The three different types of pteridophytes include:
- Ferns.
- Horsetails.
- Lycopods or Lycophytes.
Which of the following is example of class Sphenopsida?
– Equisetum is an example of Sphenopsida. Pteropsida: The plants of this class are some under ferns. Ferns have large leaves and thus are known as macrophylla.
What are examples of Sphenopsida?
EquisetalesCalamitesHorsetailsField horsetail
Horsetails/Lower classifications
Which of the following is an example of Sphenopsida?
– Equisetum is an example of Sphenopsida. Pteropsida: The plants of this class are some under ferns. Ferns have large leaves and thus are known as macrophylla. – These plants are perennial i.e. remain green throughout the year.
Who proposed classification of pteridophytes?
Reimer (1954) proposed a classification for Pteridophytes. In this classification, the Pteridophytes are divided into five subdivisions.
What are the main characteristics of pteridophytes?
The general characteristics of Pteridophytes are:
- They are seedless.
- They are multicellular.
- They reproduce through spores.
- They are independent and free-living organisms.
- They have a well-differentiated plant body into root, stem and leaves.
Which of the following belongs to Sphenopsida?
Equisetum belongs to sphenopsida/pteropsida.
Is Equisetum a pteridophyte?
Equisetum is a homosporous pteridophyte. The haploid spores germinate to form gametophyte.
Is Sphenopsida a fern?
Once considered of the same evolutionary line, these plants were formerly placed in the single group Pteridophyta and were known as the ferns and fern allies. Although modern studies have shown that the plants are not in fact related, these terms are still used in discussion of the lower vascular plants.
What is the phylum of Equisetum?
Vascular plantHorsetails / Phylum
How are pteridophytes classified write in brief?
But the discovery of pteridophytes (seed bearing ferns) broke down this artificial classification. In 1935, Sinnott introduced term Tracheophyta to include all vascular plants. Tracheophyta are further divided into four main groups : Psilopsida, Lycopsida, Sphenopsida and Pteropsida.
What are pteridophytes also called?
Pteridophytes are also called vascular cryptogams.
Is Equisetum a Gymnosperm?
Horsetails are gymnosperms Selaginella is heterosporous, while Salvinia is homosporous Ovules are not enclosed by ovary wall in gymnosperms Stems are usually unbranched in both Cycas and Cedrus….
| Question | |
|---|---|
| Question Video Duration | 3m8s |
Which among the following belong to Sphenopsida?
What is Sphenopsida class?
Class: Sphenopsida: This class is represented by only one living genus (Equisetum) and about 18 extinct forms (e.g., Calamites, Annularia etc.). This group originated during the Devonian period of Palaeozoic Era, attained their maximum development in the Carboniferous period.
What is a sphenopsid plant?
Sphenopsida (horsetails) Class of the Pteridophytina that first appeared in the Devonian and reached the peak of its abundance and diversity during the Carboniferous, forming a major component of the coal-swamp vegetation. Sphenopsids are characterized by jointed stems with whorls of leaves and branches borne at the joints (or nodes).
What is the sporophyte in Sphenopsida?
In sphenopsida (Horsetails), the sporophyte is differentiated into root, stem and leaves. The leaves may be expanded or scale-like and are always arranged in whorls.
What is the classification of Psilotopsida?
Class: Psilotopsida: The members of the class Psilotopsida show close resemblance in fundamental characteristics to the Silurian and Devonian members of Rhyniopsida (e.g., Rhynia, Cooksonia), Zostero- phyllopsida (e.g., Zosterophyllum) and Trimero- phytopsida (e.g., Trimerophyton, Psilophyton).