Plants Theme 5 Flashcards
Which hormone promotes growth in plants?
auxin
What hormone stimulates growth and elongation of stems in plants and contributes to bolting and fruit enlargement?
Gibberellins
What do cytokinins do for plants?
enhance growth and retard aging
A gaseous hormone responsible for senescence
Ethylene
Abscisic acid (ABA) effect on plant
suppress growth and drought tolerance
Brassinosteroid hormone
regulates plant growth
jasmonates
regulate growth and role in defense
What is phototropism?
directional growth in response to light, due to light triggering auxin transport
what mechanisms allow for phototropism?
cells can divide or elongate
What is bolting?
development of a flowering stem
What is the acid growth hypothesis?
proton pumps pump H into the cell wall, releasing enzymes that break bonds between microfibrils and cellulose, allowing cells to expand
What was the cause of potato blight disease?
only growing potatoes
what is chlorosis?
yellowing of leafs due to lack of chlorophyll
what is the mechanism for physically isolating infection by surrounding it with dead cells?
hypersensitive response
What is systemic acquired resistance?
development of an immune response at a distal site
What does tannins due to plants
make them taste bitter
What do secondary metabolites do
used as defense against insects and fungi, not routinely made by plants
What induces compounds in undamaged plants to make them less palatable, and attract predatory insects to feed on parasites
volatile signals
What is a Perfect flower?
plants containing both stamen and carpels (male and female organs), most flowers are perfect flowers
What is an imperfect flower?
A plant that has a stamen or carpals, not both
What does double fertilization form
embryo (2n) and endosperm (3n)
What do ovaries develop into?
Fruit
What happens when a plant is self pollinated?
not accepted
What happens with non-self pollen
pollen tube grows
