Root Zones and Tropisms. Root functions Anchors the plant Absorbs water and minerals Sends water and minerals to the xylem.

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Presentation transcript:

Root Zones and Tropisms

Root functions Anchors the plant Absorbs water and minerals Sends water and minerals to the xylem

Parts of a root Xylem carries water, Phloem carries food

Parts of a root Root hairs- absorb water and minerals

Parts of a root Area of Mitosis: growth

Parts of a root Root Cap: Digs into ground

2 basic types of roots 1. Fibrous Roots are tangled together Helps prevent erosion 2. TAPROOT one long root, like dandelion

What is it? Spanish moss

Root adaptations A change that helps an organism survive 1. Aerial Roots Grow above ground, up in the air, suspended in a tree Usually in rain forest, can get water from air and rain Examples: Spanish moss, orchids

Aerial roots

Orchid

More Spanish moss

Why? Tree canopy is ft in air Jungle floor is very dark

So an aerial root Can grow 150 ft up in the air Without having to put down roots into the soil Can grow where the sunlight is without competition from the trees

What is unique about this plant?

PROP roots Above ground roots, but most of root is underground Used to support a top heavy plant Examples are corn and Get ready, this is really really cool Banyan tree Ready?

All one tree roots grow out of branches to support the weight

TROPISMS Response to a stimulus Controlled by chemical hormones called auxins

Hydrotropism Response to Water Sketch:

Phototropism Response to Light Sketch:

Geotropism or gravitotropism Response to Gravity