Starch and bubbles

Question 1

Test for starch 1 and why?

Answer 1

Put leaf in boiling water

*To break open cell wall and membrane, softening leaf. To get inside or something out of leaf.

Question 2

Test for starch 2 and why?

Answer 2

Put leaf in ethanol (flammable(don’t put above flame in boiling water))

*so it removes chlorophyll

Question 3

Test for starch 3

Answer 3

Leaf turns crispy and white. Therefore turn off Bunsen burner and put leaf in hot water to soften it.

Question 4

Test for starch 4

Answer 4

Test for starch with iodine.

• if it turns black/blue starch is present.
• if it turns orange/brown no starch is present.

Question 5

Bubbles experiment
What do you change?

Corms

Answer 5

Change - distance of lamp from beaker.

Light intensity

Question 6

Bubbles experiment
What do you repeat?

coRms

Answer 6

repeat 10 times for ¡each distance!

Question 7

Bubbles experiment
What do you measure?

corMs

Answer 7

• Count the number bubbles per min.

* Volume of water displaced.

Question 8

Bubbles experiment
What’s the organism?

cOrms

Answer 8

Pond weed.

Same species.