SeedPlantsI 10-27

SeedPlantsI 10-27 - Seed Plants I 10/27/2008 I. What is a...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Seed Plants I – 10/27/2008 I. What is a seed? Embryo surrounded by nutritive tissue, all covered by a seed coat Embryo has ploidy of 2N = next sporophyte generation Seed coat = also 2N because it is the previous sporophyte generation Nutritive tissue = depends can be N or 2N II. Why is a seed important? Serve as a dispersal mechanism allows next generation plants to be somewhere else Protection – seed coat can be very tough and resistant against harsh elements and animals digestion Seed also provides dormancy – mature seed can easily be dormant and wait until conditions are right To humans – plants (more specifically seeds) comprises a large amount of our caloric intake ex. Corn, wheat, and rice (seeds). Seeds have a lot of nutritive tissue! III.How do seeds develop? Develop from an ovule and the integument covering the ovule Integument seed coat Inside integument = megasporangium Fertilization occurs seed develops
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
IV. Heterospory Life Cycle of Selaginalla vs Pine Gymniosperm Ex. Selaginella Sporophyte = dominant generation Strobili = collection of sporangia Female sporangium has 4 megaspores in it. Megaspore will be released into
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/15/2010 for the course BIS 1C 22222 taught by Professor Dehesh during the Spring '08 term at UC Davis.

Page1 / 4

SeedPlantsI 10-27 - Seed Plants I 10/27/2008 I. What is a...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online