Write characteristics of pteropsida.
Answers
Characteristics of pteropsida are as follows:-
1. This is usually named as ferns.
2. These types of plants are used as ornamental plants.
3. Large leaves are found in them which is made up of macrophylls.
4. Body of these plants is made up of roots & stems.
5. Macrophylls is also known as megaphylls.
6. In young duration of their life span leaves in them are circinately coiled.
7. Sporangia is seen in some aquatic ferns. Salvinia, Azolla & Marsilea are the best example of this.
8. Some famous ferns are Adiantum, Pteridium, Pteris etc.
Answer:
Pteridophyta Characteristics
1. Pteridophytes are considered as the first plants to be evolved on land:
It is speculated that life began in the oceans, and through millions of years of evolution, life slowly adapted on to dry land. And among the first of the plants to truly live on land were the Pteridophytes.
2. They are cryptogams, seedless and vascular:
Pteridophytes are seedless, and they reproduce through spores. They contain vascular tissues but lack xylem vessels and phloem companion cells.
3. The plant body has true roots, stem and leaves:
They have well-differentiated plant body into root, stem and leaves.
4. Spores develop in sporangia:
The sporangium is the structures in which spores are formed. They are usually homosporous (meaning: one type of spore is produced) and are also heterosporous, (meaning: two kinds of spores are produced.)
5. Sporangia are produced in groups on sporophylls:
Leaves that bear the sporangia are termed as sporophylls. The tip of the leaves tends to curl inwards to protect the vulnerable growing parts.
6. Sex organs are multicellular:
The male sex organs are called antheridia, while the female sex organs are called archegonia.
7. They show true alternation of generations:
The sporophyte generation and the gametophyte generation are observed in Pteridophytes. The diploid sporophyte is the main plant body.
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