Question:

In Pinus, male cone bears a large number of

Updated On: Jul 28, 2022

ligules
anthers
micro-sporophylls
mega- sporophylls

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The Correct Option is C

Solution and Explanation

Microsporophylls and megasporophylls are the leaf-like structures on which microsporangia (pollen sacs) and magasporangia are borne on the same plant of Pinus. The sporophylls are aggregated in form of cones. (a) Male cones are smaller, also known as microstrobili (staminate strobili). (b) Female cones are larger, known as macrostrobili (ovulate strobili). Each male cone consists of an elongated axis, bearing a number of spirally arranged microsporophylls. On the underside of which two microsporangia develop and get filled with microspores (pollen grains). Anther or microsporangium is the male reproductive structures of angiosperms. Microsporangium forms microspores (pollens), through microsporogenesis. Ligule is a tongue-like membranous outgrowth, present on upper surface, near the base of the microphyllous leaf in pteridophytes (eg, Selaginella). The ligule shrinks and becomes inconspicuous in mature leaves.

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Concepts Used:

Gymnosperms

Gymnosperms are flowerless plants that produce cones and seeds. It literally means "naked seed". They sit exposed on the surface of leaf-like structures called bracts. Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes. They are abundant in temperate forest and boreal forest biomes with species that can tolerate moist or dry conditions.

Characteristics of Gymnosperms

They do not produce flowers.
Seeds are not formed inside a fruit.
They are found in colder regions where snowfall occurs.
They form cones with reproductive structures.
Xylem does not have vessels and the phloem and it has no companion cells and sieve tubes.