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Examine bell pepper skin under a microscope and explore the tiny structures that give peppers their bright colors. Observe how plant cells store pigments that contribute to the red, orange, or yellow appearance of the fruit.
Materials
- Small piece of red bell pepper skin (outer layer)
- Microscope
- Glass slide and coverslip
- Dropper or pipette
- Distilled water
- Tweezers
Instructions
- Cut or tear a very thin, transparent piece of red bell pepper skin using tweezers.
- Place one drop of water in the center of a clean glass slide.
- Lay the thin piece of bell pepper skin flat on the drop of water. Smooth gently so it lies flat and even.
- Lower a coverslip slowly at a 45° angle to avoid trapping air bubbles.
- Observe under the microscope. You’ll see rectangular plant cells surrounded by cell walls, with bright red or orange contents — these are carotenoid pigments stored in chromoplasts inside the cells.
- Draw or photograph the view. Label cell wall, cytoplasm, and carotenoid pigments (chromoplasts).
What’s going on?
- The red color of bell pepper skin comes from carotenoid pigments. These pigments are stored in specialized structures called chromoplasts inside the plant cells.
- Under the microscope, you can clearly see the rigid cell walls (which give the pepper firmness) and the colorful pigment bodies that give the skin its bright red color.
- Carotenoids are important for plants because they help absorb light energy and protect chlorophyll from damage. They’re important for humans too! They act as powerful antioxidants, and some carotenoids (like beta-carotene) are used by the body to make vitamin A.
Level
- Intermediate
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