Fotosintesis menghasilkan zat tepung / starch

Name    : Adhelia Brilianty

Class     : VIII-A/ 8A

Number : 01

Biology Report
PHOTOSYNTHESIS PRODUCE STARCH

Objective            : To know the result of photosynthesis.

Plants are autotrophic organism which they can produce their own food for energy through photosynthesis. Photosynthesis needs Carbon dioxide and water to produce glucose and as starch.

My activity is having an experiment to maintain starch from plant.

The materials are below:

-          Plant leaves                                                                       -   70% Alcohol

-          Carbon paper or aluminum foil                                         -   Iodine/ lughole

-          Beaker glass                                                                     -   Pinset/ forceps

-          Bunsen burner                                                                   -   Filer paper

-          Pipette                                                                                -   Matches

-          Tube holder                                                                        -   Water

-          A Petri dish                                                                        -   A tree pot

The steps are below:

1.       I find a plant which has a green thin and quite wide leaf in the garden.

2.       I choose a leaf that it get sun rays directly at day. But I do not pick the leaf.

3.       I cover the middle part of the leaf with the carbon paper or aluminum foil before sunrise, and I pick its leaf before sunset.

4.       I separation the leaf that covered by carbon paper from the leaf uncovered carbon paper.

5.       Then I heat/ cook the leaves in boiled water for 5 minutes.

6.       I pick up the leaves and put in the tube that contains alcohol. Then I heat/ cook it in the water. I wait until the leaf change to pale white.

7.       Then I take the leaf, I clean from alcohol with hot water and I put the leaf on the filter paper. I dry it out. I put the leaf on a Petri dish and then drop the leaf with Iodine.

8.       What will happened to the 1^st leaf that covered by carbon paper? What will happen with the uncovered leaf?

9.       I write the result of activity into the table below

No	Kinds of leaf	Before drop with Iodine	After drop with Iodine
1	Leaf that covered by carbon paper	Pale white	Pale white
2	Leaf that uncovered by carbon paper	Pale white	Blue

ANALYSIS

1.       a. What is the purpose the leaves boiled in water? To withered up of leaf cell.

b. What is the purpose the leaves boiled in alcohol? To solvent chlorophyll.

2.       What is the function of Iodine in this experiment? To proof the content of carbohydrate.

3.       Which part of the leaf that changes the color into blue color when it dropped by Iodine? Uncovered leaf.

4.       Which part of leaves that produce starch? Uncovered leaf. Because it gets sunlight to do photosynthesis process, so it produces starch.

Make a conclusion from this activity! One of the result of photosynthesis process is starch.