Give two features of Pinus that classify it under the group gymnosperm.
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Answer:
They are evergreen, perennial lofty trees with spirally growing branches which give pyramidal or conical appearance. The body is divided into stem, roots and needle-like leaves. There are two types of branches: the long shoot of unlimited growth and dwarf shoot of limited growth.
Male Cones – the male strobili or male cones have microsporophylls, which have the microsporangia that produce the haploid microspores. Some of these microspores develop into male gametes called the pollen grains, while the rest degenerate.
Female Cones – the megasporophylls form a cluster and are called as the female strobili or cones. They bear the ovules having the megasporangium. Thus produces the haploid megaspores and a megaspore mother cell.
– the megasporophylls form a cluster and are called as the female strobili or cones. They bear the ovules having the megasporangium. Thus produces the haploid megaspores and a megaspore mother cell.The megaspore mother cell undergoes meiotic division produces four megaspores. One of these megaspores develops into the multicellular female gametophyte. The female gametophyte also has two or more archegonia, which are the female sex organs.