Thursday, August 16, 2012

Let's experiment @Nature Secret Lab

Location: Nature Secret Lab @Pusat Sains Negara
Age; 7-12yo
Fee Structure:
RM2/member (adult & children)
RM4/non-member (adult & children)

Experiment #1; Respiration & Photosynthesis
Objective; To show the plants remove the carbon dioxide from atmosphere through photosynthesis process.
Materials
 Briefing on method.
 The plan
Pour the bromothymol blue into the bottle.
 Blow!! And watch the colour change. DON'T DRINK. Coz u r fasting!! And it's poisonous!! 
The color of the solution changed to yellow due to the addition of carbon dioxide. Which makes the solution more acidic.
CO2 (from air blow) + H2O (from BTB) --> H2CO2 (Carbonic acid)
How can we turn the color back to blue?? Add on elodea (an aquatic plant).Close the bottle and place it in the sunlight.
After one day, the oxygen produced from the photosynthesis process will change the solution color to blue.

Experiment #2; Seed anatomy
Objective:  To learn about parts of seed. 

With a forcep, gently peel off the skin of the seed.
 Take a magnifying glass and identify embryo, cotyledon, seed coat and leaves.
 Record the observation.

Experiment #3; Looking for stoma
Objective: To examine the stoma on the leaf sample.

Take a leaf. Paint the underside of the leaf surface with a thick patch of nail polish. Make sure it doesn't touch the vein.
 Allow the nail polish to dry completely. Gently peel the nail polish patch from the leaf using the forcep.
Carefully place the patch on the glass slide. Put a drop of water and cover it with slide cover. Using microscope, make an observation to see the leaf's stoma.
 Since it's fun playing with the nail polish, we do it again. And again :-)
If u can get a clean patch of nail poilsh, u will get something like this under the microscope. This is how the leaf's stoma looks like.
Plants have special pores called stoma to allow passage of material. Most stomata are on the lower epidermis of the leaves on plant. The number of stomata on the epidermal surface can tell you a lot about a plant. Usually, a high concentration of stomata indicates fast growth and wet climate.

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