Topic 9: Plant diversity II Flashcards
What plants are better adapted for terrestrial life?
seed plants
Describe the reduced gametophyte life
microscopic develop inside cones/flowers dependent on sporophyte protects gametophyte from environment ensures nutrients for gametophyte
Define heterospory
production of 2 different types of spores
A megaspore grows into …
megagametophyte (female)
A microspore grows into …
microgametophyte (male)
Define ovule
megaspore + megasporangium + integuments
Define integuments. What does it form?
protective sporophyte tissue around megasporangium, form seed coat
Define pollen grain
male gametophyte within pollen wall (with sporopollenin)
Where does pollen grain develop from?
microspore
How many cells does a male gametophyte have?
2 cells
What are the two types of cells that male gametophyte makes? What do each of them produce?
Tube cell: produces pollen tube
Generative cell: produces sperm
Define pollenation
transfer of pollen to part of plant containing ovules
How does pollination happen in seed plants?
by wind or animals
NOT fertilization
What is the significance of pollination?
sperm dispersal isn’t water dependent so plants can be colonized in dry habitats
Where is the sporangia located?
within cone “scales”