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Signalling Molecules and Apoptosis (3/4 Biology) - Coggle Diagram
Signalling Molecules and Apoptosis
(3/4 Biology)
Plant Hormones (plant growth regulators)
Tropisms
Positive Tropisms
Growth is toward the stimulus
Examples: phototropism (light), thigmotropism (tendrils grabing objects), hydrotropism (water)
Negative Tropisms
Growth is away from the stimulus
Examples: gravitropism (gravity), hydrotropism (water)
Transport
Plasmodesmata
Allows cell to cell diffusion
Xylem
Elongated hollow cells that allow the transportation of water
Phloem
Elongated hollow cells that allow the transportation of materials
Air
Common Plant Hormones
Abscisic Acid
Causes stomatal closure
Auxin
Diffuses from the tip of the plant, away from the light
Target cells are the dark side of the plant
Stimulates the elongation of cells
Enables phototropism
Cytokinins
Stimulates cells to divide by mitosis
Activates growth of young fruit
Ethylene
Causes fruit ripening
Causes flowers to open
Development of abscission zone
Intentional shedding of leaves, fruit, flowers or seeds
Gibberellins
Stimulates the elongation of cells
Animal Hormones
Neurotransmitters
Cytokines
Neurohormones
Pheremones
Apoptosis