Testing for starch (summer exam)

Question 1

Glucose produced in photosynthesis can be stored as s______

Answer 1

Starch

Question 2

Glucose produced in photosynthesis can be stored as s______ This means the presence of starch indicates p_____________ has taken place

Answer 2

Starch, photosynthesis

Question 3

Before testing for starch:
H___W______ is used to stop any further photosynthesis & r_______ the waxy cuticle (waxy layer)

Answer 3

Hot water, remove

Question 4

E_______ is used to remove ch_________ - easy to see the change in colour

Answer 4

Ethanol, chlorophyll

Question 5

Test for starch: Iodine
Results:
Positive result: Leaves will turn bl____ b____k – starch is present, p____________ has occurred

Answer 5

Blue, black, photosynthesis

Question 6

Negative result: Leaves will be o_______ (colour of i_______)

Answer 6

Orange, iodine