STC Plant Growth and Development

Lesson 13: Making a Brassica Model

Option BKennewick School District

Materials list—Option BFor petals: 4 yellow styrofoam meat trays

OR 1 plastic milk jug painted yellow

OR Cardboard painted yellow

For anthers: 6 styrofoam packing “peanuts” painted yellow

OR 6 yellow jelly beans

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

For filaments to support the anthers: 6 pipe cleaners

OR 6 soda straws

OR 6 popsicle sticks

OR 6 coffee stirrers

Materials list continued on next slide…

Materials list (cont.)—Option BFor leaves and sepals: 2 green plastic 2-liter soda bottles

OR 1 plastic milk jug painted green

OR Cardboard painted green

For the pistil: 1 cardboard tube

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

For fastening parts to the stem: Modeling clay

OR Styrofoam balls with a center hole

For the stem: 1 dowel or sturdy twig

Directions 1. Draw and cut out the following parts

and paint them the appropriate colors:4 petals4 sepals3 to 5 true leaves2 seed leaves

2. Paint the six anthers yellow. Poke four long and two short filaments into the anthers to support them. Use pipe cleaners, soda straws, popsicle sticks, or coffee stirrers for the filaments.

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

Directions 3. Fasten all the parts to the stem. Use

lumps of modeling clay or styrofoam balls with a center hole cut to fit the dowel. Use this as the base for attaching parts to the stem.

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

Directions 4. Now the model is complete. It can be

either hand held or stood up in a coffee can of sand for support.

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

Figure 13-5

Fully assembled model plant

Clean up and put all supplies where they belong.

STC Plant Growth and Development Lesson 13B: Making a Brassica Model

Critique another group’s model for accuracy. Think about:

Does it have the correct number of petals and anthers?

Is only one pistil shown? Are the parts in the right places? Has the model been done neatly? Is it attractive? How much effort does it show?

STC Plant Growth and Development Lesson 13B: Making a Brassica Model