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Plant hormones and responses (gibberellins hormone (affect seed growth,…
Plant hormones and responses
Auxin hormone
It is responsible for plant lengthen and elongation
The cell gets bigger by getting h2o
it is produces in apical meristems
moves in 1 diection
Ethylene hormone
Function: Affects the ripening of fruit
Note:
-The only gaseous hormone.
-Transports through phloem as well as spaces between cells.
gibberellins hormone
affect seed growth
transported through the vascular tissue
causes cell elongation
stimulate cell division
Human approach to using Gibberellins is spraying it on plants to increase plant height.
Yara, Maha, Rand
cytokinins hormone
promote cell division in plasma membrane by stimulating the production of the proteins needed for mitosis and cytokinesis
increase the rate of growth
they travel to other parts within xylem
Nastic response
a response that cause movement that is not dependent on the direction of the stimulus
its reversible
example: opening of leaves at the morning and the close of leaves and the night to conserve heat
when the stimulus ends the leaves return to their original position
tropic responses
tropism: is a plant’s growth response to an external stimulus
If resulting plant growth is toward the stimulus, it is called a positive tropism
If the resulting plant growth is away from the stimulus, it is called a negative tropism.
types of tropism:
Phototropism is a plant growth response to light caused by an unequal distribution of auxin
Gravitropism is a plant growth response to gravity
thigmotropism. This is a growth response to mechanical stimuli, such as contact with an object, another organism, or even wind
