Friday, February 24, 2017

Leaf Test of starch



Leaf test of starch 
Apparatus 
1. leaf 
2. fire 
3. Iodine
4. Ethyl alcohol
5. Water 
6. Test tube

Procedure 
  1. After 4 green leaves were collected, 2 of them were put into the beaker of 150 mL of water boiling over the bunsen burner and tripod.
  2. After 2 minutes, the leaves were taken out from the beaker and were put into the test tube of ethanol. The test tube was then put in the warm beaker used in step 1.
  3. After some time, the leaves were taken out from the ethanol test tube. They were then laid down on a white paper along with 2 other fresh leaves.
  4. Iodine was dropped onto each of the leaves on the paper using the pipette. The color change of the iodine drops on the leaves and the soaked iodine on the paper were then observed



    .Discussion Questions
    1. Why do we boil the leaves? - When the leaves are boiled, the cell walls are weakened and broken, allowing the organelles including the chloroplast out, stopping all the reactions from taking place inside the leaves.
    2. What is the leaf texture like after boiling? - The leaf becomes softer, smoother, and appear less green.
    3. Why do we use ethanol on the lead after boiling? - We use ethanol on the leaf to extract the chlorophyll out.
    4. What is the color of the water after boiling the leaf? Why? Why did some people get pink brown water? - The color of the water appeared pink brown after boiling because the leaves are relatively small and thin relative to the leaves of other groups. The boiling time is therefore too long for the leaves and substances other than chlorophyll are extracted as well.
    5. When you test for starch with the iodine, why did the paper turn black? - After the iodine is dropped onto the boiled leaves, the iodine turned black because the starch test is positive. When the iodine soaks the white paper, it then turned the paper black.
    6. What happened to the iodine test on the unboiled leaf? Why? - The iodine didn't turn black for the unboiled leaves because the chlorophyll and the starch is not extracted out of the cell.

Titrade lab


 TITRATE  LAB



Round 1
Round 2
Round 3
Strong Acid (HCl)
4
3.8
3.6
Weak Acid
12.2
12.2
11.6


Equipment
1.  titrate tube 
2. strong acid (HCl)
3. weak acid
4. base

 method 
  1.  The Burette is clamped onto the stand. Then, the base is poured until it reaches 50mL mark of the burette.
  2. A beaker filled with 10mL of acid is set up under the Burette stand.
  3. Carefully and patiently, the base is released from the burette. Every time the base is released and the indicator turns purple, the beaker is swirled. Until the acid permanently turns purple, more drops of the base are added to the acid.
  4. Once the acid does not turn clear again even after swirling, the volume of added base was identitied by looking at the scale on the Burette.








Plant graft


The plant graft lab

Apparatus 
1. scissors
2. knife 
3. plant 
4. clay (Plasticine)
5. rope 

Procedure
1. Cut two branch  of two plants into V shapes  
2. then changes one of the branches to the others branch
3. stick the branch which we cut to the branch in the trunk by the plasticine 
4. when you stick it by the plasticine then  bundle the rope out of the plasticine for sure

     







Questions
1.  Why do we use clay?
     Connecting them together by using clay help to make sure that they are in a fixed position or don't move apart.
2.  Why do we cut at the node?  what is the node?
     The node is where the branch can grow. It is beneficial for a new grafted branch to supply a nutrient supported by a vascular bundle.
3.  Why do we use string to tie it?
     The original shape of clay might be changed, so we use a string to hold.
4.  Any observations?
Observation
- Both clay and a rope are in fixed position with holding the branch.
- Attached branch still alive because the leaf is still green.
Discussion
My group graft a plant in a safe place where there is no risky circumstances such as a rain to a plant.


Friday, December 2, 2016

Now burn baby burn lap


                                                                          Burn Lap









            This experiment is an experiment to find the calories in foods by measuring the temperature change in the system to calculated the energy from the food. by the solution Q=ms(Delta T)



Trail 1
Intial temperatur of water
24
25
Final temperature of water
65
67.5
Nutritional  infor
0.613
0.618

Apparatus:  1. Alcohol Burner
                  2.  The lighter     
                          3.  potato chips (Lays)
                4. Thermometer
          5.  Test tube
 
          First, we burned the potato chip by the alcohol burner then use the fired from potato chip to increase the temperature of the water and then observed the final temperature from the thermometer. the last step is record the resulted in to the table and use the results to calculated.

Sunday, November 27, 2016

optical illusion

                                                       



                                                              OPTICAL ILLUSION



  In this day  all of us learned about how ours brain worked to response to the image illusion if we look at it by your eyes with out measuring we will think that the both side are equal however if you measuring the real length of both side you will see that it is not equal to the opposite site I think this is rely on the line between two side that make us think it is an component line and decided the two side are equals.


Monday, September 19, 2016

Say hi to shrimp skeloton


              Equipment 
     1. shrimp 
     2. magnifying glass
     3. spalpel
     4. needles
       
               

step 1:  disect head of shrimp from shrimp body for looking organs inside the shrimp


step2 :  disect the shrimp body in the sagital plane without their outermost shell





step 3 : disect shrimp head in the sagital plane too



from the experiment we can concluded that most organs of shrimp are located inside theirs head or we can called the cepharothorax of arthopod however in theirs boday their have the intestine located there 

 External anatomy
1. eye stalk : I think it like when shrimp eyes see the resuls will through pass eye stalk to theirs brain  
      2.  rostum :  use to fight with theirs enemies and use to kill theirs prey 
      3. uropod : use to direction when shrimp swimming 
      4. telson : use when shrimp will swimming up or down 
      5. pleopods : use to help shrimp can swimming easier 

Internal anatomy
      1.  lymphoid organ : use to injected vibrio
      2.  stomach : digest food 
      3.  hepato pancreas : produced bile and gastric juice
      4.  heart : pump blood around the body (but in shrimp blood did not use to contains the oxygen)