BIO6.2 Flashcards
(22 cards)
ROOT SYSTEM
-Absorption
Transport
Hormones
Storage
Anchorage
SHOOT SYSTEM
Photosynthesis
Reproduction
Transport
Waste Removal
Hormones
Storage
PHOTOSYNTHESIS
6 CO2 + 6 H2O + light energy → C6 H12 O6 + 6O2
Light energy is absorbed by chlorophyll in
chloroplast and converted into chemical potential energy in glucose.
ONLY DURING DAY
CELLULAR RESPIRATIN
C6 H12 O6 + 6O2 (ARROW) 6CO2
+ 6H2O + energy (ATP)
process of turning
energy stored in glucose into a form usable
by the cell, ATP.
DAY AND NIGHT
GAS EXCHANGE
occurs by diffusion through
the cell wall and plasma membrane
Gas exchange occurs primarily in the
spongy mesophyll of the leaf
HOW DO GUARG CELLS REGULATE WATER LOSS BY TRANSPIRATION?
by becoming limp and closing when water
levels begin to run low.
STOMATA
hot, dry cliamtes
fewer stomata opened
STOMATA
high humidity
more stomata opened
STOMATA
little CO2
stomata opened for longer
XYLEM TISSUE
Delivery of water from roots.
Moves water and dissolved minerals (nutrients) between the roots to the leaves
where these substances are used in
photosynthesis.
PHLOEM TISSUE
Distribution of sugars.
Moves foods (sugars) from the leaves to the
rest of the plant.
COHESION
Attraction of water molecules to water
molecules.
ADHESION
Attraction of water molecules to other
substances
ROOT PRESSURE
Minerals actively transported into root
cells, thereby producing a hypotonic
environment.
Through osmosis, water flows into cells,
creating positive pressure, thereby forcing
water and dissolved minerals up the
xylem.
TRANSPIRATION
Has effect of pulling water up the stem by
creating tension (aka: transpiration pull) on
the column of water present in the xylem
Depends on temperature.
High temperatures increase the rate
of transpiration.
“tropism”
turning of plant in response to external stimulus
phototropism
light
gravitropism
gravity
thigotropism
touch
positive vs negative gravitropism
shoot/stems = negative (moving away from gravity)
roots= positive (moving towards gravity)
relationship between photosynthesis and cellular respiration
photosynthesis uses CO2 and H2O to produce glucose and O2, which is then used by cellular respiration to generate energy (ATP), releasing CO2 and H20 as byproducts.
Why multicellular?
Cell specialization - increased efficiency
size- can grow larger
interdependence of cells- not reliant on one cell to stay healthy
