Homeostasis in Plants Ms Blalock Ms Hartsell and

Homeostasis in Plants Ms. Blalock, Ms. Hartsell and Mr. Luckman

Do Now • What are the necessary ingredients for photosynthesis to occur? • What are the products of photosynthesis?

Today’s Aim and Objectives • AIM: How do water and CO 2 play a role in helping a plant maintain homeostasis? • Objectives: Students will be able to… – Identify guard cells and stomata in a diagram – Explain how a plant maintains homeostasis – Understand the role of stomata and guard cells in a plant – Understand the role of water and CO 2 in a plant – Make connections between homeostasis and the process of photosynthesis

Today’s Agenda • • • 1. Do Now 2. Activity 1: Reviewing Photosynthesis 3. Activity 2: Lab→ Homeostasis in Plants 4. Closing→ Homeostasis: Plants vs. Humans 5. Exit Ticket

Activity 1: Reviewing Photosynthesis Definition: The process by which light energy is converted into chemical energy. In other words, it is when plants take light energy and use it to make food in the form of sugar (glucose).

Activity 2: Lab → Homeostasis in Plants • Directions: Read Page 1 of the lab on Homeostasis in Plants. Once you are finished, respond to the following question independently and silently: Why do plants need to maintain homeostasis? (Hint: How is the process of photosynthesis affected if homeostasis in a plant is not maintained? )

Think, Group, Share Respond to the following question: 1. Independently 2. As a group 3. As a whole class How do the different structures of a plant work together maintain homeostasis in a plant?

Step 1: Structures of a leaf • Directions: Using the information in the reading, as a group take 2 minutes to label the cross section of a leaf. • When your group is finished, check your answers with the key located in the back of the classroom.

Step 2: Cross section of leaf

Step 3: Tradescantia leaf

Steps 4 -6: Creating a model • Directions: Each group will put together a model of the cross section of a leaf. Everyone in the group will work together to color the different pieces of the model. • The following roles should be assigned: – Materials: Person goes to get the materials for the lab – Scissor Hands: This person cuts out the pieces of the model – Manager: This person makes sure the model is correct before it is glued together – Gluer: This person glues the pieces together

Step 7 and 8: Simulating Photosynthesis • Directions: Complete Steps 7 and 8 as a group. Keep the same roles as before. • Check with the teacher before gluing

Check Point! • Directions: Once you have finished Step 8, check in with the teacher before moving on to the Summary Questions. • Once the teacher has signed off for your group, begin answering the Summary Questions INDEPENDENTLY and SILENTLY

Closing: Homeostasis in Plants vs. Humans • AIM: How does water and CO 2 play a role in a plant maintaining homeostasis? • Making connections: How would you compare and contrast the regulation of homeostasis in plants and humans?

Exit Ticket • You have 5 minutes to complete the Exit Ticket. • If you talk during the Exit Ticket – First time, it is warning – Second time, you will receive a zero