Tubes that send the water up from the

roots

Plants with green, easily bent stems

Plants with green, easily bent stems

Tubes that send food down from the

leaves to the rest of the plant

Tendency of plants to grow toward the light

Special chemicals which cause certain

behaviors in plants

Plants with stiff stems that get thicker as

the plant gets older.

Inside stems are bundles of xylem and phloem which are called _________ bundles.

Woody stems have __________, but herbaceous stems do not.

Sunflowers are examples of plants with extreme __________________.

Vascular cambium makes more xylem and phloem during the spring and summer, then less

in the fall; this creates ____________, which can then be counted to find out how many

years a tree has lived.

Auxins tend to multiply in the light.

Scientists don’t know all the details of how auxins cause phototropism.

Plants grown in the sun tend to grow much taller and thinner than those grown in

semi darkness.

Cactus plants do not have leaves; instead, their stems do photosynthesis

Phototropism means “turning towards the light.”

Auxins cause the cells of stems to stretch out.

Some plants, like strawberry plants, produce runners, which are stems which grow side-ways along the ground.

Photosynthesis can only happen in the leaves of plants.

Stems grow longer by adding cells to their ends.

A

B

C