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Question

Chooose the correct statements.
  1. Gymnosperms are heterosporous
  2. Cones with megasporophylls are called female strobili
  3. Megasporangium develops into a unicellular female gametophyte
  4. Archegonia are male sex organs


Solution

The correct options are
A Gymnosperms are heterosporous
B Cones with megasporophylls are called female strobili
The gymnosperms are heterosporous; they produce haploid microspores and megaspores. The two kinds of spores are produced within sporangia that are borne
on sporophylls which are arranged spirally along an axis to form lax or compact strobili or cones. The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili. The megaspore mother cell (enclosed in the sporangium) divides meiotically to form four megaspores. One of the
megaspores enclosed within the megasporangium (nucellus) develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs. The multicellular female gametophyte is also retained within megasporangium.

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