5th grade ch. 4 lesson 4 how do plants grow
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Ch. 4 Lesson 4How do plants grow?
““mile a minute plant”mile a minute plant”-can grow up to 1 foot per day-can grow up to 1 foot per day
tropisms• ways that plants change their direction of growth in response to environment
gravitropism•roots grow downward b/c of gravity
phototropism• plant’s reaction to light
• stem grows toward light
thigmotropism
•plant’s growth in response to touching an object
growth hormone• chemical that affects
plant growth
• can make cells grow larger
• cells may also look larger b/c vacuoles fill w/ water
gravitropismgravitropism
Name that Name that tropism!tropism!
Name that tropism!Name that tropism!
phototropismphototropism
Name that tropism!Name that tropism!
phototropismphototropism
Name that tropism!Name that tropism!
phototropism & gravitropismphototropism & gravitropism
Name that tropism!Name that tropism!
thigmotropismthigmotropism
Tropisms in our neighborhood
Plant name
Location
Type of tropism
Sketch or describe tropism