Plant Blood
What is needed for a guard cell to open a stoma?
light and water
There are numerous plant hormones but many of them can be grouped into HOW MANY major categories.
5
Define photoperiodism
an organism's response to seasonal day length changes
Define tropism
the response of a plant to an environmental stimulus whereby roots, stem or leaves move toward or away from the stimulus
What kind of genome does vegetative reproduction produce?
identical
A property called cohesion is the tendency of substances to do what?
to stick together
Name TWO of the five hormone types in plants
auxins, cytokinins, gibberellins, ethylene and abscisic acid
Name ONE of the two types of photoreceptors associated with photoperiodism
phytochromes and crytochromes
a sunflower head following the sun is an example of
positive phototropism
Both the microspore and megaspore mother cells are haploid, diploid or triploid?
diploid
Explain the cohesion-tension theory
transpiration in the leaves produces low pressure which pulls water into the leaf. B/c of cohesion, all the water molecules are pulled up the xylem.
Which category of plant hormone is important in apical dominance?
auxins
What are the 3 types of plants to respond to length of daylight
long-day plants (need 12-14hrs+)
short-day plants (less than 12-14hrs)
day-neutral plants (based on temperature)
A venus flytrap snapping shut in response to an insect landing on it is . . .
thigmotropism
How many nuclei and cells are present in the female embryo sac?
8 nuclei and 7 cells (the large central cell has 2 nuclei)
Is a mature leaf a sink or a source? What does that mean?
a source; it has a higher concentration of sugar
If a plant is smaller than it should be, what hormone is being inhibited?
Gibberillins
What are the 3 types of flowering plants
annuals - 1 growing season
perennial - multiple growing seasons
biennial - 2 growing seasons, flowering year 2
A venus fly trap plant is a plant that exhibits what tropism when it closes over an insect?
thigmotropism
A pollen grain is the male/female gamete and is made up of what types of nuclei?
male gamete with 2 sperm and 1 tube nuclei
How are materials transported in the phloem?
Using the pressure-flow model
What two plant hormones are important in abscission?
ethylene and abscisic acid
Abscission is a wintering strategy of woody plants. How?
Abscission is the process of leaves being sealed and falling off which both prevents winter damage and lowers resource demand.
The type of tropism demonstrated in your bean shoot experiment is called ____ and is caused by THIS hormone
gravitropism and auxin
The fertilized egg cells becomes the _____ of the seed and is haploid/diploid/triploid. The fertilized central cell becomes the _____ of the seed and is haploid/diploid/triploid.
embryo - diploid
endosperm - triploid