Testing a Leaf for Starch

What is a variegated leaf?

• One that has chlorophyll in some bits and not in others

• A random leaf

• A leaf that has chlorophyll in all parts of it

Tags

NGSS.MS-LS1-6

Why do we boil the leaf?

• To keep it warm

• To denature the enzymes and so stop photosynthesis

• To make photosynthesis go faster

Tags

NGSS.MS-LS1-6

Why do we turn off the bunsen flame before adding ethanol?

• Not sure

• To save on gas

• Because ethanol is extremely flammable

What is chlorophyll soluble in?

• Ethanol

• Water

• Don't Know

What colour does the leaf turn after being in ethanol?

• It stays green

• It turns blue

• It turns white

Tags

NGSS.MS-PS1-2

To show that photosynthesis has occurred we test for starch. Why?

• Starch is a product of photosynthesis

• Not sure

• Glucose is a product of photosynthesis and is stored in the plant cells as starch

Tags

NGSS.MS-LS1-6

What do we use to test for starch?

• Fluorine solution

• Chlorine solution

• Iodine solution

If starch is present in the leaf, the leaf should turn what colour?

• Blue/Black

• Orange

• Red

Tags

NGSS.MS-LS1-6