Exploring Osmosis in Red Onion Cells

The video tutorial demonstrates an experiment with red onion cells in fresh and salt water. It begins with preparing a slide using the correct layer of onion skin, followed by observing the cells under a microscope. The tutorial explains the effects of salt water, causing plasmolysis, and how fresh water can reverse this process through osmosis. The experiment highlights the dynamic changes in cell structure due to different water environments.

What is the first step in preparing the red onion for the experiment?

• Peeling off the outer layer

• Placing it under the microscope

• Adding salt water

• Cutting the onion into small pieces

Which layer of the red onion should be used for the slide?

• The layer with the most white

• The outer layer with purple

• The inside layer with no purple

• Any layer

What should you do if the cover slip does not sit flat on the slide?

• Leave it as it is

• Cut off the extra white piece

• Smoosh it down

• Add more water

What is the dark outer layer observed under the microscope?

• Cell wall

• Cytoplasm

• Mitochondria

• Nucleus

What are the small circles observed inside the cells?

• Chloroplasts

• Ribosomes

• Nuclei

• Vacuoles

What is the purpose of adding salt water to the slide?

• To make the cells grow

• To change the color of the cells

• To clean the slide

• To observe plasmolysis

What happens to the cells when salt water is added?

• They disappear

• They shrink

• They expand

• They change color

What is the term used to describe the shrinking of cells in salt water?

• Endocytosis

• Diffusion

• Plasmolysis

• Osmosis

How can the plasmolysis be reversed?

• By shaking the slide

• By heating the slide

• By adding fresh water

• By adding more salt water

What process is demonstrated by the cells shrinking and swelling back up?

• Photosynthesis

• Osmosis

• Active transport

• Diffusion