All About Leaves
The type of plant which loses its leaves in the winter
What is deciduous?
The evaporation of water from the leaves of a plant
What is transpiration?
Chemicals circulating through multi-cellular organisms that regulate cellular processes
What are hormones?
These pigments have different colors, depending on the pH of the leaf tissue.
What are anthocyanins?
The part of the plant that transports the food produced in the leaves back down to the stem & roots
What is the phloem?
The mystery group of hormones
What is florigen?
The type of pigment responsible for orange and yellow color in leaves (and pumpkins & carrots)
What are carotenoids?
The mechanism through which water moves up through the roots into the stem & leaves of the plant; involves adhesion and cohesion
What is capillary action?
The group of hormones responsible for tropisms in plants
What are auxins?
The thin layer of tissue at the base of each petiole (leaf stem); cause leaves to fall off trees in winter by blocking the xylem & phloem
What is the abscission layer?
When a plant responds to a stimulus and the direction of the response is NOT dependent on the direction of the stimulus
What is a nastic movement?
A type of movement that a plant can have; this is the general name for the type of movement that depends on the direction of the stimulus
What is a tropism?
The part of the leaf where chlorophyll-containing cells are the most densely packed, making it very dark green; usually at the top of the leaf.
What is the palisade mesophyll?
Maintaining this is one of the 4 main reasons plants need water; involves water filling the plant cells' central vacuoles, keeping the plant stiff and able to stand.
What is turgor pressure?
These hormones have the opposite effect of the auxins; instead of producing elongation, they inhibit cell elongation and cause cells to grow thicker, allowing leaves to expand for example
What are cytokinins?