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WorksheetsTesting a Leaf for Starch
Total questions: 8
Worksheet time: 4mins
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
Why do we boil the leaf?
To keep it warm
To denature the enzymes and so stop photosynthesis
To make photosynthesis go faster
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
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
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
