how many species of pteridophytes course hero

Full Answer

How many species of pteridophytes are there?

The Pteridophyte group has a fossil record dating back to the Devonian period, a period of time during the Paleozoic Era, lasting from about 416 to 359 million years ago. Today, there are about 13,000 species in 35 plant families and 568 genera.

Do pteridophytes produce spores?

Instead, Pteridophytes produce spores. Spores are living, single-celled structures that are essential to the life cycle of many plants. The life cycle of pteridophytes is very similar to that of other spore-producing plants. The next sections will examine how pteridophytes reproduce and the unique structures involved in the process.

Is a pteridophyte an autotroph?

They undergo photosynthesis, so they are autotrophs, meaning they make their own food. Pteridophytes differ from bryophytes, however, in that they are vascular plants with structures for transporting water from roots, through stems, and into leaves.

What are the examples of Pteridophyta?

Following are the important examples of Pteridophyta: 1 Whisk Fern 2 Dicksonia 3 Selaginella 4 Lycopodium 5 Equisetum 6 Pteris 7 Dryopteris 8 Adiantum 9 Man fern 10 Silver fern More ...

How many species are found in pteridophytes?

Pteridophytes do not have seeds or flowers either, instead they also reproduce via spores. There are around 13,000 species of Pteridophytes.

How many species of pteridophytes are found in India?

70 species are endemic to India. In India Pteridophytes are distributed in all the phytogeographical zones of India ranging from sea level to alpine Himalayas where they grow as Hydrophytes, Mesophytes, Lithophyte, Epiphyte, Hemiepiphyte, Climbers etc.

What are the three types of pteridophytes?

Ferns, horsetails (often treated as ferns), and lycophytes (clubmosses, spikemosses, and quillworts) are all pteridophytes.

What are the six classes of pteridophytes?

Classification of PteridophytesPsilopsida.Lycopsida.Sphenopsida.Pteropsida.

How many species of ferns are there in India?

The ferns are a very large and complex group of plants, comprise of about 12,000 species belonging to 214 genera and 33 families; among them about I 150 species belonging to 140 genera and 28 families have been reported to occur in India.

How many species fern in Andaman and Nicobar Islands?

Of which, angiosperms are the predominant group, comprising of 2314 species, 31 subspecies, 89 varieties and 6 forma under 1011 genera in 181 families, constituting 92% of entire flora of the Andaman and Nicobar Islands.

What are the 4 classes of pteridophytes give examples?

The four classes of pteridohytes are Psilopsida , Lycopsida, Sphenopsida , pteropsida and example are club-mosses and horsetails . Explanation: pteridohytes are vascular plants and have leaves (known as fronds) , roots and sometimes true stems , and tree ferns have full trunks .

What are the five subdivision of pteridophytes?

Classification of PteridophytesReimer (1954) proposed a classification for Pteridophytes. In this classification, the Pteridophytes are divided into five subdivisions.Psilophytopsida.Psilotopsida.Lycopsida.Sphenopsida.Pteropsida.There are 19 orders and.48 families in the classification.

What are pteridophytes Class 11?

A pteridophyte is a free-sporing vascular plant with xylem and phloem. Pteridophytes are often referred to as "cryptogams," meaning that their means of reproduction are secret since they do not grow flowers or seeds.

How many sub groups are there in Pteropsida?

Pichi-Sermolli (1959) has sub divided Filicopsida (pteropsida) into seven sub-classes, viz., Primofilicidae, Ophiglossidae, Marattidae, Osmundiade, Filicidae, Marsilidae and Salvinidae.

Which pteridophyte is called as horse tail?

EquisetumSo, the correct answer is option 'Equisetum'.

What is Pteridophyta kingdom?

Pteridophyta (pteridophytes) A division of the plant kingdom, comprising the vascular cryptogams. They are flowerless plants exhibiting an alternation of 2 distinct and dissimilar generations. The first is a non-sexual, spore-bearing, sporophyte generation.

What is the life cycle of pteridophytes?

The life cycle of pteridophytes is very similar to that of other spore-producing plants. The next sections will examine how pteridophytes reproduce and the unique structures involved in the process.

What is a pteridophyte?

Pteridophytes Are Vascular Plants. Pteridophytes are part of a large group of plants called tracheophytes. Tracheophytes are plants that have a vascular system, which allows for water and nutrients to be transported throughout the plant.

What is a pteridophyte that produces two types of spores called?

Conversely, a pteridophyte that produces two types of spores is called heterosporous. Heterosporous plants produce two kinds of spores – megaspores and microspores – which are female and male, respectively. The gametophytes that result from a heterosporous plant are thus dioecious, either female or male.

What is the name of the slender herbaceous clubmoss?

Lycopodium is the largest genus in the family. In general, clubmosses are slender, herbaceous plants that have leaves called microphylls. Microphylls are usually compressed to the stems, creating scale-like structures and give the plant its prehistoric look.

Which group of plants developed vascular tissue?

Pteridophytes were the first group of plants to develop vascular tissue when they diverged from bryophytes millions of years ago. They contain two kinds of vascular tissue – xylem and phloem. Xylem is responsible for transporting water and minerals.

How are spores formed?

Sporangia are structures in which spores are formed through meiosis. Spores are released from a sporangium, usually in dry conditions when the outer casing cracks and opens up. The spores are then dispersed by wind or water to start the next generation, the gametophyte.

How do gametophytes produce eggs?

Gametophytes produce gametes (eggs or sperm) through mitosis. These gametes are haploid (1n) and contain only half of the genetic information of the plant. They are formed in structures called archegonia or antheridia. The archegonium forms the eggs, while the antheridium produces sperm.