Wednesday, February 22, 2017

Last Bloggerrrrr

My favourite task we did this year was the ice cream lab, we even got to eat the ice cream in the end. We made an oreo flavour ice cream and a chocolate one. I have learnt to finish a blogger within 5 minutes (just when k.Gary says he’s going to check them). My plans for next year include getting into Thammasat International Dentistry faculty.


Wednesday, February 1, 2017

Finding Pang // Leaf Test for starch

Purpose: The purpose of this lab is to prove there is starch present in leaves.

Steps:
1)Boil 100ml of water

2)Put leaf in beaker

3)Take the leaf out and out it in test tube filled with ethanol


4)Put the test tube inside the beaker

5)Wait until the ethanol turns green

6)Take leaf out and drop iodine on it

7)Watch leaf turn black

Discussion questions:


1)  Why do we boil the leaf?
The purpose is to stop any more reaction to occur within the plant.

2)  What is the leaf texture like after boiling?
It is softer than before. The leaf was initially brittle and stiff.

3)  Why do we use ethanol on the leaf after boiling?
We use ethanol to rid the leaf out of water.

4)  What is the color of the water after boiling the leaf?  why?  Why did some people get pink brown water?
The water becomes green because of the chlorophyll that came from the leaf. 

5)  When you test for starch with the iodine, why does the paper turn black?
The water turned dark because the flame was orange.

6)  What happens to the iodine test on the unboiled leaf?  why?
The leaf didn't turn black because of the protective layer of the leaf called the cuticle.





Sunday, January 29, 2017

Titration Lab

Purpose:
The purpose of this lab is to determine the concentration of base needed to turn hydrochloric acid into a base.

Apparatus:
  • beaker

  • pipette
  • pipette bulb
  • buret funnel

  • Erlenmeyer flask
  • phenolphthalein indicator
  • biuret with clamp

Steps:
1) Set up equipment
2) Rinse water in biuret
3) Pour hydrochloric acid into beaker
4) Drop base into beaker drop by drop
5)Watch the solution turn pink




Sunday, January 22, 2017

GMO essay

TBH that Thailand should allow genetically modified organisms.

There have been no true risk of eating and cultivating genetically modified organisms but rather improvements in agriculture and the financial benefit that comes with it. Mixing plant species is how we got rid of papaya viruses corn plants that survive through drought and potatoes that don't bruise. Most people who are against GMOs have reasons based on their own feelings rather than the results they see. These people are not used to change therefore base their opinion on their personal feelings rather than the evidence of GMO being actually bad. Because so far they haven't been only harmless but have helped us took a step forward to solve problems such as world hunger and eradicate some types of plant diseases as well.


Wednesday, January 4, 2017

Plant Graft

Problem:

We want to try to merge to plant of the same specie by connecting their nodes.

Hypothesis:

The the nodes will consolidate and become a branch.

Materials:


  1. Thread
  2. Clay
  3. Two plants of same specie

Procedure:


  1. Cut the node of one plant and another (same specie) in a v shape 

  1. Merge them together

  1. Wrap clay around 

  1. Tie a thread around the clay

Data:

(none)

Conclusion:

The plant did not survive through the fist three days. The plant and clay disappeared. 

Questions:


1.  why do we use clay?
            We used the clay to connect the stems together
2.  why do we cut at the node?  what is the node?
            We cut at the node because it is where the branches grow from.
3.  why do we use string to tie it?
             We used the string to help the clay set itself before it went dry
4.  any observations?
            The plant did not survive
5. Please discuss why KK/Boss/Mobiles' plant graft worked while others failed.
             The clay and string were used in a sufficient amount to connect both plants without it being too heavy. 
6. How would you design an experiment to test this theory
              Grapht two plants. One with a lot of clay another with less.  
7.  What do you think are three keys to a successful graft
               Well wrapped clay
               Little rain
               

Wednesday, December 14, 2016

Thermometer lab

Apparatus :



  • Tray
  • Milk
  • Test tube Rack
  • Salt
  • Ice
  • Mini Oreos, Gummy bears & other goodies
  • Flask
  • Thermometer
  • Sealing bags


Steps:

  1. Pour milk into sealing bag and flask 

  1. Prepare the tray:
    1. Fill it with ice
    2. Add salt (To decrease the freezing point of water = colligative property)

  1. Put the sealed bag in the tray

  1. Use the test tube rack to move the ice to one side
  2. Put the thermometer in the flask 
  3. Put the flask in the tray
  4. Measure temperature and make notes.
  5. Eat ice cream happily


Monocot vs Dicot

Apparatus:

  • Slide

  • Cover Slip
  • Water
  • Pipette
  • Microscope
  • Plant: Leaf, Stem, Root
`
  • Scalpel

Steps:

1) Cut the small piece of plant using a scalpel and place it on the slide.
2)Put a drop of water on the slide and the cover slip on top
3)Use the microscope to observe the leaf/stem/root of the plant

Review Questions:

1) The leaf is a monocot therefore it has a fibrous root system. It's number of petals is divisible by 3.
2) If it is a single petiole it the leaf is simple. If the petiole is divided into smaller petiole, the leaf is compound. 3) The two vascular tissues located within the vein are the xylem and the phloem. The xylem transports water and minerals, the phloem transports sugars.
4) The primary function of the leaf is photosynthesis. They are flat and provide a large surface are for absorption of sunlight and gas exchange. Leaves vary with respect to arrangement on the stem, venation, and anatomy.