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Pteridophytes are seedless vascular plants that reproduce by spores, such as ferns, horsetails, Lycopodium and Selaginella. They have true roots, stems and leaves with xylem and phloem, a dominant diploid sporophyte and a small independent gametophyte. They were among the first plants with vascular tissue and still need water for fertilisation.

They are called cryptogams because they reproduce by spores and have no flowers or seeds, so their reproduction is hidden compared with flowering plants. They are vascular because they have xylem and phloem to conduct water and food. Together, the name separates them from bryophytes, which are cryptogams without true vascular tissue.

The diploid sporophyte is the dominant, long-lived generation in pteridophytes. It is the plant you normally see, with roots, stems and leaves. The haploid gametophyte, called the prothallus, is small and short-lived but independent, because it photosynthesises and anchors itself with rhizoids until fertilisation takes place.

Heterospory is the production of two kinds of spores: small microspores that form male gametophytes and larger megaspores that form female gametophytes. Selaginella, Marsilea, Salvinia and Azolla are heterosporous. Heterospory is important because the female gametophyte is retained in the megaspore, which is considered a step towards the evolution of seeds.

A prothallus is the haploid gametophyte of a fern or other pteridophyte. In ferns it is usually a small, green, heart-shaped structure that grows from a spore, makes its own food and carries antheridia and archegonia on its lower surface. After fertilisation, the young sporophyte grows from it and the prothallus dies.

A sorus is a cluster of sporangia, usually on the underside of a fern frond. In Dryopteris each sorus is protected by a kidney-shaped flap called the indusium. Sori release spores when the annulus of each sporangium dries out and pulls the wall open, scattering the spores into the air.

The annulus is a row of thick-walled cells around the fern sporangium. As it dries, the cells lose water and pull the sporangium wall apart at a thin region called the stomium, then snap back and throw the spores out. It is a key structure to label in sporangium diagrams.

The main types are the protostele, with a solid central xylem core; the siphonostele, with a central pith and either outer phloem or phloem on both sides; and the dictyostele, where leaf gaps break the cylinder into separate strands. Lycopodium and Selaginella show protosteles, while many ferns show dictyosteles.

In pteridophytes the diploid sporophyte is dominant and has true roots, stems, leaves and vascular tissue. In bryophytes such as mosses, the haploid gametophyte is dominant and the sporophyte depends on it, and true vascular tissue is absent. Both still need water for fertilisation and reproduce by spores.

Pteridophytes reproduce by spores and have free-living gametophytes, while gymnosperms produce seeds and their gametophytes are reduced and retained on the parent plant. Gymnosperms do not need water for fertilisation because pollen carries the male gametes. Heterosporous pteridophytes show early steps towards the seed habit seen in gymnosperms.

Azolla is a small floating water fern that hosts the cyanobacterium Anabaena azollae, which fixes atmospheric nitrogen. Farmers use it as a biofertiliser in rice paddies to add nitrogen to the soil and reduce chemical fertiliser use. It is also used as livestock feed and has been studied for removing pollutants from water.

Pteridophytes are covered in NCERT Class 11 Biology under Plant Kingdom, in NEET biology, in B.Sc Botany papers on pteridophytes or cryptogams, and in undergraduate plant diversity modules worldwide. Indian university papers often expect detailed type studies of Lycopodium, Selaginella, Equisetum, Pteris and Marsilea with labelled diagrams.

Draw neat, large outline diagrams in pencil, label every part with straight lines, and add a short title. For life cycles, mark where meiosis and fertilisation occur and show which stages are haploid and diploid. For anatomy, draw transverse sections of the stem showing the stele type clearly.

Yes. A botany tutor explains classification, life cycles and anatomy, checks your diagrams and helps you plan long answers on topics such as stelar evolution and heterospory. You write and submit your own work, so you understand the topic for exams and stay within your university's academic integrity rules.