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Goals for Today
⚫Students conduct experiments to observe and record root
growth over time.
⚫Students know that roots grow down to get wa nd minerals
for the nt.
⚫Students observe and understand that leaves grow toward light
to make food for the nt.
⚫Students understand nts change to live in their environment.
What do you want to
share and communicate today?
Have you done scientific research? Did some of you try
experiments at home last week ?
Would you like to share your findings and what you learned
with the class?
What Do You Know?
nts and Their Environments
Did you know light, gravity, touch, or environmental
stress can affect the germination, and growth of nts?
What causes nts to change as they grow?
nts and Their Environments
Textbook, page 52
⚫In which direction do roots grow?
⚫In which direction do leaves grow?
⚫Why are the roots growing down?
(to get wa nd nutrientsfrom soil)
⚫What causes roots to grow down?
(Roots respond to gravity)
How Do Roots Grow?
在家做书上53页的科学试验 Read the textbook, page 53
Please do thi periment at home,
you can share your observations and
look at the results after one or two
weeks.
We are going to watch how many
roots sprout from bean seeds.
Depending on how many beans there
are, it may take longer for some roots
to grow.
Don’t forget to add water if the
paper towel dries out.
How Do Roots Grow?
Predict
How will the roots of each seed grow?
How do roots find which way is down?
Why do roots grow downward?
Think about it
How does gravity helps roots grow?
Do bean seeds have a top side like people?
Vocabulary
Germinate: When a seed germinates,
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