Question

In seed plants, which of the following structures evolved into a pollen grain?

• A. Sporophyll
• B. Male gametophyte
• C. Female gametophyte
• D. Sporopollenin

Answer 1

The correct option is B Male gametophyte

• The male gametophyte (sperm) is in the anther of a plant. This structure is responsible for making pollen. So the male gametophyte is always contained in a pollen grain.
• A sporophyll is a leaf that bears sporangia. Both microphylls and megaphylls can be sporophylls. In heterosporous plants, sporophylls (whether they are microphylls or megaphylls) bear either megasporangia and thus are called megasporophylls, or microsporangia and are called microsporophylls.
• The angiosperm female gametophyte is critical for plant reproduction. It contains the egg cell and central cell that become fertilized and give rise to the embryo and endosperm of the seed, respectively.
• Sporopollenin is one of the most chemically inert biological polymer. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments.