BIOSC-101 Lecture Notes - Lecture 21: Megaspore, Microspore, Gymnosperm
21 Dec 2020
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Plant diversity ii you should be able to: Name the five key features of seed plants. The following are common to all seed plants. Pollen: seeds, advantages of reduced gametophytes. Seed plants have highly reduced gametophytes within the parent sporophyte. Can obtain nutrition from the sporophyte: heterospory: the rule among seed plants. Megasporangia produce megaspores that give rise to female gametophytes. Microsporangia produce microspores that give rise to male gametophytes: ovules and production of eggs. An ovule consists of a megasporangium, megaspore, and one or more protective integuments. Inside each ovule, a female gametophyte develops from a megaspore and produces one or more eggs: pollen and production of sperm. Microspores develop into pollen grains, which contain the male gametophytes. Covered with a tough coat containing sporopollenin. Pollination is the transfer of pollen to the part of a seed plant containing the ovules. Pollen eliminates the need for a film of water.
