Forces in Nature
Forces in Plants
(Top part of flap)Turgor Pressure – internal water pressure that prevents wilting and provides support.-----------------------------------------------------------------------------Tropisms: Growth Responses
- Phototropism – growth towards light- Geotropism – roots grow with gravity –
stem away- Hydrotropism – roots grow towards water
-----------------------------------------------------------------------------Seedling Emergence – seedling stem tip pushes away from gravity to reach sunlight above the ground.
Turgor Pressure (wilting)
(low turgor pressure) (high turgor pressure)
Phototropism The plant is
growing towards the
light
Stem grows opposite gravity and roots grow with gravity
Geotropism Seedling Emergence
Internal Stimuli (this is on the top flap)
Internal Stimuli in animals – the body responds to maintain balance
Sneezing
Our response when germs and other foreign invaders have entered your body
Fever
Our bodies raise their temperatures to fight germs and other foreign invaders
Animals may vomit to rid
themselves of internal
contamination
Internal Stimuli in Plants
Internal Stimuli (this is on the bottom flap)
Animals’ responses to External Stimuli
External Stimuli (this is on the top flap)
REFLEX – an action that is performed without conscious thought as an automatic response to a stimulus.Example: a
person moves their leg instantly
when the tendon by
their knee is struck
FIGHT or FLIGHT – an animals response to a threatening situation
FIGHT FLIGHTor
Plants’ Responses to External Stimuli
External Stimuli (this is on the bottom flap)
Growing towards it
is the response.
The Sun is the
stimulus.
PHOTOSYNTHESIS
Plants use the Sun’s radiant energy to make sugar. Energy is stored as food (chemical energy), while releasing O2.Animals do the
opposite. We use that chemical energy converting it to movement and heat, while releasing CO2 and H2O.
Phototropism Time lapse (corn)
Phototropism Time lapse (tomato)