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List and describe 3 organ systems in the human body.

Write your answer in your science journal.

Big Picture

LS1.A: Structure and Function

All living things are made up of cells, which is the smallest unit that can be

said to be alive. An organism may consist of one single cell (unicellular)

or many different numbers and types of cells (multicellular).

•Objectives: List three functions of roots and three functions of stems. Describe the structure of a leaf. Identify the parts of a flower and their functions.

Learning Target

Today I will: learn about the parts of a plant

So that I can: begin to see the similarities of plant and animal organization.

I will know I got it if: compare and contrast properties and functions of plant and animal systems.

Agenda

Today we will:

Watch a video

Teacher presentation.

Group and individual work

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Vocabulary

xylem

phloem

root

stem

leaf

stamens

pistils

Video

https://www.youtube.com/watch?v=PhRiKU6nYk0

• There are two types of vascular tissue in plants:

• Xylem is the type of tissue in vascular plants that provides support and conducts water and nutrients from the roots.

• Phloem is the tissue that conducts food in vascular plants.

•Visual Concept

Roots

• Root Functions The following are the main functions of roots:

• Roots supply plants with water and dissolved minerals.

• Roots hold plants securely in the soil.

• Roots store surplus food made during photosynthesis

Roots, continued

• Root Structure The layers of cells that cover the surface of the roots is called the epidermis.

• After water and minerals are absorbed by the epidermis, they diffuse into the center of the root where the vascular tissue is located.

•A root cap can be found at the end of the root. The root cap protects the tip and helps the root continue to grow.

Stems

•Stem Functions A stem connects a plant’s roots to its leaves and flowers. A stem also has the following functions:

•Stems support the plant body.

•Stems transport materials between the root system and the shoot system.

•Some stems store materials.

Stems continued…

•Woody Stems Trees and shrubs have rigid stems made of wood and bark. These stems are called woody stems.

Leaves

• Leaf Functions The main function of leaves is to make food for the plant.

• Leaf Structure The structure of leaves, shown on the next slide, is related to their main function— photosynthesis.

Leaves, continued

• Leaf Adaptations Some leaves have functions other than photosynthesis.

•The leaves of many cactuses are modified as spines. These spines keep animals from eating the cactuses.

• The leaves of sundews are modified to catch insects, which the sundew digests.

Flowers

• Flowers are adaptations for sexual reproduction.

• Sepals and Petals The modified leaves that make up the outermost ring of flower parts and protect the bud are called sepals.

• Petals are broad, flat, thin leaflike parts of a flower.

Flowers, continued

• Stamens and Pistils The male reproductive structure of a flower is called a stamen.

• A Pistil is the female reproductive structure of a flower.

Flowers, continued

• The Importance of Flowers Flowers help plants reproduce.

• Humans use flowers for arrangement. Flowers are also used to make spices, perfumes, and lotions.

• Broccoli, cauliflower, and artichokes are flowers that people eat. Chamomile and hibiscus flowers are used to make tea.

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