Question

Explain the two special mode of reproductive observed in pteridophyte only

Answer 1

Pteridophytes :

These plants are the ones that don't have any blossoms or seeds. Consequently, they are additionally called Cryptogams. They incorporate plants and horsetails. Truth be told, they can be considered as the main earthbound vascular plants, demonstrating the nearness of the vascular tissue, xylem, and phloem. They can be found in for the most part in clammy and obscure spots. Most greeneries are developed as decorative plants.

Highlights of Pteridophytes :

Pteridophytes show separation. The plant body can be separated into a genuine root, stem, and leaves. A saprophyte is the primary plant body here. A portion of the animal varieties having a place with this division have little leaves called as the microphylls. For instance, Selaginella. Megaphylls are the substantial leaves that a few pteridophytes have. For Example Fern plants. The primary plant bears the sporangia. These bear some leaf-like members called the sporophylls. In a couple of animal types, for example, Selaginella and Equisetum, the sporophylls shape reduced structures called cones or strobili.

Reproduction in Pteridophytes :

Pteridophytes demonstrate a genuine shift of ages. Here, the overwhelming sporophyte produces spores through meiosis. The gametophyte age shapes gametes by mitosis. The spores are delivered by the sporangia in the spore mother cells. These spores develop and offer ascent to gametophytes.

These gametophytes are free-living, multicellular and photosynthetic. They are called as the prothallus. For the most part, the gametophytes require soggy and cool spots to develop, because of their reliance on water. For this very reason, the development of pteridophytes is restricted to certain geological zones.

The male sex organs are known as the antheridia and the female sex organs are known as the archegonia. The male gametes are known as the antherozoids, which are discharged by the antheridia. Antherozoids can get exchanged to the archegonia which are the female sex organs, just within the sight of water. When the combination of the gametes happens, a zygote is shaped. This zygote delivers the sporophyte, after division.

At the point when the spores of the plants are comparative then these plants are called homosporous plants. Heterosporous plants are the ones that have two various types of spores. They are the megaspores and the microspores. In these heterosporous plants, the megaspores and microspores grow and give female and male gametophytes separately.