BELL WORK (Buff Binder):Copy the question below and write your entire answer:

Gametes produced by flowers are used to carry out what function?

a. Transportationb. Photosynthesisc. Gravitropismd. Reproduction

Set up today’s page…

• Page: 66• Date: 2-19-15• Title: Plant Transport• Essential Question: How do the

support and transport systems help plants maintain homeostasis?• YES, Cornell notes!

Today we’re going to look at how plants maintain homeostasis.

STRUCTURE & SUPPORT

Roots: • Hold plant in

position• Absorb water

and minerals from the soil• Contain

specialized cells for water intake

(Wheat seed)

Root hairs

Fragile parts of cells that grow from the main root

They massively increase the surface area for absorption

Root hair cells (x150)

Stems:

•Support structures

•connect and carry water & nutrients between roots and leaves

TRANSPORT SYSTEM

Vascular tissue: specialized tissues used to move water and nutrients throughout a plant

Xylem: cells that carry water up from

the roots

Phloem: cells that transport food (from

photosynthesis) down from the leaves

What about leaves?

Leaves: organs that perform photosynthesis and contain vascular tissue

Cuticle: a thick waxy layer that protects against injury and water loss

GAS EXCHANGE

• Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf

• They have small holes called stomata on the under surface

• Each hole is open & closed by 2 guard cells

Stomata: openings in the underside of a leaf

that allow carbon dioxide and oxygen to

diffuse (move) into and out of the leaf

Guard cells: specialized cells that control the

opening and closing of stomata

Each opening is controlled by two guard cells.

closed open

gas exchange in the leaf

Carbon dioxide

oxygenGuard cell

Structures of the Leaf

Photosynthesis

Conserves water

Transports water and sugar to stem

and roots

Why do stomata open and close?

Stomata open and close at different times of the day

OPEN = when carbon dioxide is needed for photosynthesis

CLOSED = to conserve water

Gas exchange

Transpiration: the loss of water through leaves

Debrief/Summary: Explain how a plant might respond to each of the following situations…

1. drought (not enough water)2. flood (too much water)3. extra carbon dioxide in the air due to

some crazy person singing to their plants4. not enough carbon dioxide in the air