Starch

Question 1

What is the aim of the experiment?

Answer 1

To test for starch in substances using iodine solution

Question 2

What is the hypothesis?

Answer 2

Starch will cause an iodine solution to turn from a yellow to a blue-black color when present in a substance

Question 3

What is a positive test for starch?

Answer 3

If iodine is added to starch, the iodine changes from a yellow-brown to a blue-black. This is a positive test for starch

Question 4

What is a negative test for starch?

Answer 4

Substances that do not contain starch, will not change the color of the iodine. this is a negative test for starch

Question 5

What color did the chalk solution take on?

Answer 5

The iodine solutions color which is a yellow/brown color

Question 6

What is the control of the experiment?

Answer 6

The chalk solution

Question 7

What color did the starch solution turn?

Answer 7

Blue/black.

Question 8

What have you learnt form this experiment?

Answer 8

Iodine solution changes form a yellow color to a blue/black color in the presence of starch. The color change in iodine can be used to test plant organs and foods for the presence of starch.

Question 9

Explain the term polysaccharide?

Answer 9

It is a carbohydrate built up of numerous monosaccharide molecules joined together

Question 10

What plant organelle is starch stored in?

Answer 10

Amyloplasts

Question 11

What characteristic of starch makes it a good storage compound?

Answer 11

It is insoluble in water