What is gymnosperm classification?

Gymnosperms are non-flowering plants belonging to the sub-kingdom Embophyta. The seeds are not enclosed in an ovary or fruit. They are exposed on the surface of the leaf-like structures of the gymnosperms. They can be classified as Coniferophyta, Cycadophyta, Ginkgophyta and Gnetophyta.

How many classifications of gymnosperms are there?

The gymnosperms are subdivided into five Divisions, four of which, the Cycadophyta, Ginkgophyta, Gnetophyta, and Pinophyta (also known as Coniferophyta) are still in existence while the Pteridospermatophyta are now extinct.

What are the 4 divisions of gymnosperms?

Comprising 65 genera and 720 species, the gymnosperms are divided into four extant divisions, Coniferophyta (the conifers), Cycadophyta (the cycads), Ginkgophyta (the ginkgoes), Gnetophyta (the gnetophytes) and two extinct divisions, Pteridospermophyta and Cycadeoidophyta.

Who is the father of gymnosperms?

Answer: The term Gymnosperms was first introduced Theophrastus in 300 B.C. in his book “Enquiry into Plants” but Robert Brown in 1827 recognized the group that –female flowers of Cycads and conifers are actually naked ovule.

What are classification of plants?

While there are many ways to structure plant classification, one way is to group them into vascular and non-vascular plants, seed bearing and spore bearing, and angiosperms and gymnosperms. Plants can also be classified as grasses, herbaceous plants, woody shrubs, and trees.

What is the main plant of gymnosperms?

The main plant body of gymnosperms is the diplid sporophyte. All gymnosperms are heterosporous and produce two types of spores – male microspores and female megaspores. The spores are borne on chambers known as sporangia that are present on modified leaves known as sporophylls on the sporophyte.

Which is the smallest gymnosperm?

Zamia pygmaea
Smallest Gymnosperm – Zamia pygmaea

The smallest living cycad and (presumably) the smallest gymnosperm in the world is Zamia pygmaea, growing no taller than 10 inches.

What is the life cycle of gymnosperms?

The gymnosperm life cycle has a dominant sporophyte generation. Pollination occurs when pollen is transferred from a male to female cone. Zygotes develop into embryos inside seeds, from which the next generation grows. If the seed germinates, it may grow into a mature sporophytes tree, which repeats the cycle.

What are the classes of angiosperms?

Based on the types of cotyledon present, angiosperms are divided into two classes. They are monocotyledons and dicotyledons.

What are the order of gymnosperms?

The modern gymnosperms are commonly grouped under four orders:
  • Cycadales;
  • Ginkgoales;
  • Coniferales and.
  • Gnetales.

How many orders are present in class gymnosperms and Gnetopsida?

ii) Phyllospermae – in which the ovules are borne on leaves. In 1971 David Bierhorst proposed a classification in which he divided gymnosperms into three classes: Cycadopsida, Coniferopsida and Gnetopsida. Cycadopsida and Coniferopsida include five orders each, while as Gnetopsida includes three orders.

How many angiosperm species are there?

Angiosperms are plants that produce flowers and bear their seeds in fruits. They are the largest and most diverse group within the kingdom Plantae, with about 300,000 species. Angiosperms represent approximately 80 percent of all known living green plants.

Which is the smallest gymnosperm?

Zamia pygmaea
Smallest Gymnosperm – Zamia pygmaea

The smallest living cycad and (presumably) the smallest gymnosperm in the world is Zamia pygmaea, growing no taller than 10 inches.

What is the life cycle of a gymnosperm?

Gymnosperms have both haploid and diploid life cycles, which means they reproduce through generational alternation. They go through a sporophyte-dominant cycle. The gametophyte stage lasts only a few days. Cones are commonly used as reproductive organs.