Define
Behavior
The way an organism reacts to a change in environment
what are the 3 Potential Stimuli
light
touch
gravity
what is Gravitropism
The response of a plant to gravity
what is Photosynthesis
A series of chemical reactions that converts light energy, carbon dioxide, and water into glucose and oxygen
what are things Besides oxygen that humans depend on plants for?
Food
shelter
clothing
fuel
Stimuli
Any changes in an organism's environment that causes a change in behavior
Which part of the plant typically goes through negative phototropism?
roots
where do Stems go
AWAY from gravity (negative)
what do Spongy Mesophyll Cells do?
allow for gasses to pass through the spaces between them
what does Cytokinins do
Increases the rate of cell division and slows the aging process of flowers and fruits
Tropism
A response that results in plant growth toward or away from a stimulus
What plants are known to wrap around or cling to structures?
vines
where do roots go
TOWARD gravity (positive)
what is the waxy covering on a leaf called
a cuticle
what do Gibberellins do
Present in rapidly growing areas of plants, such as roots and stems
Phototropism
The growth of a plant towards or away from light
Why might a trees growth look differently than the growth of a house plant?
A tree has more exposure, and a consistent amount of light shines on it.
what happens if you flip a plant on its side
the stem will bend and make the plant go upwards like it regularly would.
what are Xylem and Phloem
Vascular tissue within plants that transports materials needed for photosynthesis / cellular respiration
what is Ethylene and what does it do
A gas that is produced by fruits, seeds, flowers, and leaves, and it is Responsible for the ripening of fruit
Photoreceptors
Chemicals in plants that allow it to detect light
what is Thigmotropism? provide an example.
The positive or negative response of a plant to touch. An example is vines wrap around structures, this is a positive reaction.
do roots positively or negatively react to gravitropism?
Positively because they go down
The epidermal layer on the bottom of a leaf contains?
Stomata
what are Auxins
Responsible for increased plant growth and play a part in positive phototropism