Transcript POWER_AND_TECH_files/Unit 7

Plant Processes
PHOTOSYNTHESIS
• Process which allows plants to produce
their own food
Plant Processes
RESPIRATION
• Process where cells break down
nutrients with the help of oxygen into
useable energy
• Takes place in the mitochondria of the
cell
• Opposite of photosynthesis
Plant Processes
TRANSPIRTAION
• The process of loosing water through
open stomata
Plant Processes
POLLINATION
• The transfer of pollen from the male
part of a seed plant to the female part
• Only occurs with closely related species
Pollination and
Fertilization
Plant Growth Regulators
• Hormones: Chemical messengers created
by a living organisms that control growth
– Auxins: Target the stems and are produced in
the apical meristems
– Gibberellins: Stimulate cells to elongate,
enhance fruit production, and induces the
opening of flower buds
– Cytokinins: Stimulate the production of
protein leading to cell division
Plant Growth Regulators
• Ethylene: The gaseous
compound produced which
causes cell walls to weaken
and become soft
• Abscisic Acid: Slows down
metabolic process to help the
plant conserve water
– Prohibits growth
Plant Responses
• Tropism is the growth response of a
plant to and external stimulus
– Sun, artificial light, gravity
• Phototropism is a plant’s response
to light
– Plant will grow towards light
Plant Responses
• Gravitropism is a plant’s response to gravity
– Also known as geotropism
• Autotropism is how a plant grows or
elongates in a straight line
Cultural and
Environmental Factors
• When plant systems do not function
properly, a number of problems can occur
– If a plant suffers too much, it will not be
able to produce and process food, or
reproduce
• Humidity is the amount of moisture in
the air
– 30% to 60% is desirable