CHEM 2370 Lecture Notes - Lecture 25: Motility, Cotyledon, Sporopollenin

• School: University of Manitoba
• Department: Chemistry
• Course: CHEM 2370
• Professor: N A

Document Summary

Gymnosperms: gymno meaning naked and sperm meaning seed (not gamete). 3 main traits of seed plants: they undergo heterosporous spore production. In the previous lecture we talked about plants that were homosporous meaning that they produced one kind of spore (they were morphologically the same) and they gave rise to bisexual gametophytes. Heterosporous seed are produced meaning two different types of spore are produced. The spores are different in size and morphology. There are two types of spores: micro (male) and mega (female). They give rise to gametophytes that are dioecious meaning: they are unisexual and one produces only one type of gamete. The male and female gametophytes are derived from the male and female spore. In the case of the gymnosperms they are produced in the male cone. And in the case of the angiosperms, they are produced in the anther. Young microsporangia contain diploid cells and they are the site of meiosis.