Thames & Kosmos Barbie STEM Kit: Science Saves the Day handleiding

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Thames & Kosmos

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Handleiding

Dye a Flower

“It’s perfect,” Barbie said as Nikki

modeled the leaf-print dress on the

dress-design platform. “This is the

dress for the Gala. Thank you, Nikki!”

“Success! It’s so unique — it’s so you!”

Nikki said. “But I think it’s missing

something.”

“I do need a necklace. Maybe we can

make one with these white ﬂowers

from the greenhouse,” said Barbie.

“You will be like a walking botanical

garden,” Nikki joked.

“Here, help me dye these ﬂowers for

the necklace. If we color the water,

the ﬂowers will draw the colored water up

through their stems, and the petals will change

color.”

“You know, it’s not unlike the chromatography

experiment we did earlier. The plants use

capillary action, too,” Nikki explained. “I’m

going to use this in my next science fair

project!”

Help Barbie and Nikki dye the

ﬂowers for the necklace.

EXPERIMENT

You will need: Test tube,

test tube holder, fresh

white carnation (or a

stalk of celery), food

coloring, water

Fill the test tube

halfway with water.

Put 15 to 20 drops

of food coloring into

the water.

Cut 2 centimeters

(1/2 inch) oﬀ the

boom of the stem

of the ﬂower or

celery stalk at an

angle.

Place the ﬂower or

celery stalk in the

test tube.

Observe the ﬂower

or celery stalk over

the next few days.

In the same way the water moved up the cloth in the

chromatography experiment, capillary action is at work

inside of plants to move water up their stems. Some

plants, called vascular plants, have a system of tubes

that run from their roots to their leaves and ﬂowers. This

system of tubes transports nutrients, food, and water

throughout the plant, just like our arteries and veins.

When you cut oﬀ

the boom of the

celery or ﬂower,

you were opening

these tubes for

the food coloring

and water to

pass through.

The process by

which water

goes through a

plant is called

transpiration.

WHAT’S

HAPPENING?

Sunlight

Oxygen

Glucose

Water

Carbon

dioxide

Nutrients

Build the

test tube

holder from

page 9.

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