Tag: pictorial feature of plant kingdom

The total number of living gymnosperms of the world is about 850 species, belonging to 79 genera of 15 families. Although the number of species of gymnosperms accounts for only 0.36% of that of the angiosperms, they have formed large areas of various kinds of coniferous forests and are widely distributed all over the world, especially on mountains from middle to alpine latitudinal zones in cold-temperate and subtropical latitudes of the Northern hemisphere.

Sieve cells can be traced in gymnosperms and pteridophytes. Sieve cells are typically associated with gymnosperms because angiosperms have the more derived sieve tube members and companion cells in their phloem. They have a narrower diameter and are more elongated compared to sieve tube members. Sieve cells are associated with albuminous cells, which lack starch thus, making it possible to differentiate them from phloem parenchyma.
Therefore, the correct answer is option C.

The resin duct in Gymnosperms are formed by separation of cells to form a cavity. The cells surrounding this cavity secrete resin into the cavity. Resin is aromatic and prevents infection. 

The gymnosperms do not have petals or flowers, but they do produce seeds. The name 'Gymnosperm' means, 'naked seeds' and refers to the fact that the gymnosperms bears their seeds on the margins of modified leaves or cones. 

In Gymnosperms the fertilized ovule does not develop into a fruit as it would in an angiosperm. Because gymnosperms have no ovary, they can never produce fruit. Seeds develop from the ovules that are found in the developed ovaries or fruit, but in the case of gymnosperms, the ovules are located directly on the surface of the flower or cone. Yews and ginkgoes develop fruit like structures, but their seed is not inside these organs, which makes them Gymnosperms.

Gymnosperms are seed bearing non flowering plants. Since gymnosperms have no ovaries, they do not produce real fruits, at least not in the botanical sense. Because no fruit tissue surrounds gymnosperm seeds, the seeds are said to be "naked." 
In Gymnosperms vascular tissues are arranged into vascular bundles just like Angiosperms. However, xylem does not possess vessels and phloem is without companion cells, like pteridophytes.

A perennial plant or simply perennial is a plant that lives for more than two years. 

The gymnosperm is represented by a perennial, evergreen, woody plant. Most of them are trees and some are shrubs. A few gymnosperms may be lianas or climbers. There are no herbs. Gymnosperms include one of the world's tallest trees, Sequoia sempervirens.

Megasporangium or ovule is borne on adaxial or upper surface of megasporophyll or ovuliferous scale and are generally orthotropous and unitegmic in gymnosperms but are bitegmic in the Gnetales.

The gymnosperms are a group of seed-producing plants that do not produce flowers. These include conifers, cycads, Ginkgo, and gnetales. Though they are seed bearing their seeds are not enclosed in ovary they make up for about 700 species of woody plants with most of them being trees and some shrubs. A few gymnosperms however may lianas or climbers. However, there are no herbs in the group.