Explain in your own words how osmosis helps plants obtain water from the soil.

Root hair cells have a higher solute concentration than the surrounding soil, creating a lower water potential inside the cells. Water moves from the soil into the root hair cells to equalize the concentration.

What does it mean for a solution to be isotonic to blood plasma, and why is it important for IV fluids to be isotonic?

Isotonic means the solution has the same solute concentration as blood plasma. It's important because it prevents red blood cells from swelling or shrinking due to osmosis.

Which of the following statements best describes the movement of water in osmosis?

Water moves from an area of high water concentration to an area of low water concentration.

Describe how the salt concentration of the water surrounding a plant's roots can affect the plant's ability to absorb water. What term describes this phenomenon?

High salt concentration in the surrounding water can make it difficult for the plant to absorb water because the water will move out of the roots due to osmosis. This is called osmotic stress or water stress.

Explain the relationship between solute potential, pressure potential, and water potential. How do these factors influence water movement in plants?

Water potential is the sum of solute potential and pressure potential. Solute potential is negative and decreases water potential, drawing water in. Pressure potential is positive and increases water potential, pushing water out. Water moves from areas of higher water potential to areas of lower water potential.

Water Balance in Organisms

10th GradeScience40 min

Learning Objective

I can describe how organisms maintain homeostasis through water regulation.

Lesson Flow

Watch Video

10 min

Osmosis and Water Potential (Updated)

Amoeba Sisters

Guided Notes

8 min

Key concepts students will learn:

•
In osmosis, water moves through a semi-permeable membrane from areas of high water concentration to areas of low water concentration, or from areas of low solute concentration to areas of high solute concentration.
•
A solution that is hypertonic has a higher solute concentration compared to another solution, while a hypotonic solution has a lower solute concentration; an isotonic solution has an equal concentration.
•
Water potential is calculated by adding pressure potential and solute potential, and water moves to areas of lower water potential.
•
Turgor pressure, which results from osmosis and plant cell walls, is critical for overall plant structure and the ability of plants to grow upright and not wilt.

Practice

12 min

5 questions • Multiple choice & Short answer

Exit Ticket

5 min

“Explain how saltwater fish maintain homeostasis in their environment, referencing the concept of osmosis.”

Teacher Guide

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Water Balance in Organisms

Learning Objective

Lesson Flow

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Guided Notes

Practice

Exit Ticket

Teacher Guide

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