Question

Microsporangia and megasporangia are found in same strobilus in
A) Fern
B) Selaginella
C) Pinus
D) Moss

Answer 1

Answer:

Microsporangia and megasporangia are found in the same strobilus in   Selaginella

In the axils of microsporophylls and megasporophylls, respectively, the strobili carry two forms of sporangia: microsporangia and megasporangia.

Explanation:

• At the terminals of the branches of mature Selaginella, plants are sporangiferous spikes or strobili. In the axils of microsporophylls and megasporophylls, respectively, the strobili carry two forms of sporangia: microsporangia and megasporangia. Larger, white or yellowish, often lobed megasporangia contain 1-4 haploid megaspores. Smaller reniform structures that produce a lot of haploid microspores are called microsporangia. They are yellowish-reddish globular formations.
• All members of the Salviniales are virtually unique among the leptosporangiate ferns in that they are heterosporous, producing two types of spores and sporangia: megaspores, produced within megasporangia, and microspores, forming within microsporangia. This is similar to Selaginella and Isoetes of the Lycophytes.

Answer 2

Microsporangia and megasporangia are found in same strobilus in B) Selaginella.

About Microsporangia:

• Microsporangia are sporangia that generate microspores that, when they germinate, form male gametophytes.
• All vascular plants with heterosporic life cycles, including seed plants, spike mosses, and the aquatic fern species Azolla, exhibit microsporangia.
• Megaspores grow into female gametophytes, whereas microspores, which are tiny haploid spores, develop into male gametophytes.
• A gametophyte's microsporangium contains diploid microsporocytes, which go through meiosis to create haploid microspores.

About megasporangium:

• The sporangium known as a megasporangium is the source of the female gametophyte and megaspores.
• Ovule also goes by the name megasporangium.
• Megasporangium is a tiny structure that is joined to the placenta via a funicle, a stalk-like structure.
• At the hilum, which serves as the connection between the funicle and megasporangium, the funicle unites with the body of the megasporangium.

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