Flashcards in Topic 6b - Plant repro. & dev. Deck (23):
Re. alternation of generations...diploid mother cells develop from which structures? (male/female)?
Re. alternation of generations...meiosis of mother cells in sporophyte produces...?
Re. alternation of generations...male (pollen) & female gametophytes produce...?
sperm & eggs
Go thru slide 5...
kill me now!
What structures make up the stamen?
anther & filament
What structures make up the carpel?
stigma, style, ovary
1st step in fertilisation of flower...When does pollination occur?
when pollen grain lands on the stigma of a carpel...see slide 13
2nd step in fertilisation of flower...What happens after pollination occurs?
pollen tube grows down thru style of carpel, tube cell nucleus & sperm follow...see slide 13
3rd step in fertilisation of flower...Double fertilisation...
pollen tube & sperm reach female gametophyte - one sperm fuses with central cell, the other sperm fuses with egg cell...see slide 13
Fruit develops from the ...?
Seeds develop from the ...?
What are the 6 major groups of plant hormones?
Charateristics of auxins...
promotes cell elongation in shoots
inhibits cell elongation in roots
stim. fruit dev.
Charateristics of gibberellins...
promotes stem elongation
stimulates - bud sprouting, flowering, fruit prod., seed germination...
Charateristics of cytokinins...
promote cell division
inhibits lateral root branch formation
stimulates lateral shoot branch formation
nutrient transport -> leaves
Charateristics of ethylene...
in most plant tissue
ripening of fruit
Charateristics of absidic acid...
helps with adaptive responses
Charateristics of florigens...
timing of flowering
identified in 2005
Which 2 plant hormones work together?
auxins & cytokinins
What is photoperiodism? What agent is responsible? 3 types...
changes in flowering of a plant in response to changes in day length
agent - phytochrome (2 forms)
- no change
What is the important variable in photoperiodism?
duration of uninterrupted darkness (not day length per se)
2 forms of phytochrome?
Pr - absorbs light in red wavelengths
Pfr - absorbs light in far red wavelengths