Iodine Staining in Onion Cells

The video tutorial demonstrates how to prepare an onion slide using iodine stain to observe cell structures under a microscope. It covers the preparation process, safety precautions, and observations at different magnifications, highlighting the visibility of cell walls and nuclei.

What is the purpose of using iodine stain in the onion cell experiment?

• To change the color of the onion

• To make the slide slippery

• To disinfect the slide

• To enhance the visibility of cell organelles

What should you wear to protect yourself while handling iodine?

• A face mask

• Ear plugs

• Safety goggles

• A lab coat

What is the color of the iodine stain used in this experiment?

• Green

• Blue

• Yellow

• Red

What should you do if you accidentally get iodine in your eyes?

• Cover your eyes with a cloth

• Wait for it to dry

• Apply more iodine

• Rinse with water immediately

What is the first step after applying the iodine stain to the onion slide?

• Wash the slide with water

• Remove the slide from the table

• Place the slide under the microscope

• Switch to high power on the microscope

What can be clearly seen at low power after staining the onion cells?

• The chloroplasts

• The cell membrane

• The nucleus and cell walls

• The mitochondria

Why is it important to use gloves while handling the slide?

• To prevent the slide from breaking

• To avoid leaving fingerprints

• To make the slide easier to hold

• To keep the slide warm

What additional details can be observed at medium power?

• The chloroplasts

• The nucleus and some material inside it

• The cytoplasm

• The cell membrane

What is the main challenge when observing at high power?

• Focusing the microscope

• Holding the slide steady

• Identifying the cell wall

• Seeing the color of the stain

What should you do after completing the observations at high power?

• Discard the slide

• Complete the sketches on your lab sheet

• Switch back to low power

• Clean the slide with water