My favourite task is the time reaction lab because it's funny when friend can't catch the meter stick when they saying the alphabets.
My personal accomplishment: I like your class because it's relax and educational in the same time. We have done a lot of experiments also. But it's so sad this is the last class of this year.
Sunday, February 19, 2017
1) Why do we boil the leaf?
To get the chlorophyll out
2) What is the leaf texture like after boiling?
3) Why do we use ethanol on the leaf after boiling?
chlorophyll can't dissolve in water
4) What is the color of the water after boiling the leaf? why? Why did some people get pink brown water?
Green, because the chlorophyll is green. I think the water temperature is too high and react with chchlorophyll.
5) When you test for starch with the iodine, why does the paper turn black?
paper made from starch
6) What happens to the iodine test on the unboiled leaf? why?
Wednesday, February 1, 2017
- Phenolphthalein indicator
- Flask and Clamp stand
- Set up the equipment and the prepare the alkali in a burette. First, we start with a 50 cm of alkali and then slightly open the value to let the alkali drop in the 10 cm of acid in beaker and mix it with the phenolphthalein indicator. Make the alkali drop until the acid change to pink without changing back to clear colour.
Tuesday, January 17, 2017
A GMO (genetically modified organism) is process of extracting and artificially forcing the genes from the DNA of one species into the genes of an unrelated plant or animal. Also the GMO pollution will outlast than the effects of global warming and nuclear waste. Moreover, TGM crops and their associated herbicides can harm birds, insects, amphibians, marine ecosystems, and soil organisms. They reduce bio-diversity, pollute water resources, and are unsustainable. The very process of creating a GM plant can result in massive collateral damage that produces new toxins, allergens, carcinogens, and nutritional deficiencies.
how to graft plants
Plant will survive after 5 days.
First we cut at the node, one of them need to be in the V-shaped and another will be like an A-shaped (the sharp side). Next we connected them and wrap them with clay and then we try to make the clay stay in shape by wrapping the clay with rope.
1. why do we use clay?
To keep the vascular bundle connected.
2. why do we cut at the node? what is the node?
Node have vascular bundle, node is where a point or area where two lines, paths, or parts intersect or branch off.
3. why do we use string to tie it?
To prevent the clay from drying and falling off.
4. any observations?
Maybe their vascular bundles are repair perfectly so their plants are alive.
2) How would you design an experiment to test this theory
Do the same steps with different plant.
3) What do you think are three keys to a successful graft
A perfect cut, perfect connection, sling strongly hold the clay.
Sunday, December 11, 2016
1. You find a plant that has leaves with parallel venation. Considering what you know, what type of root system would you expect this plant to have? Also, how many petals would you expect to find on the flowers?
- Plant that has leaves with parallel venation have a fibrous root system.
- We would find about 3 petals
2. What structure do you look for at the base of the petiole to help determine if a leaf is simple or compound?
- simple leaves : the base of the petiole is an undivided blade.
- compound leaves: has a fully subdivided blade, each leaflet of the blade being separated along a main or secondary vein.
3.) What two vascular tissues are located within the vein? What does each transport?
- Phloem transport nutrients
- Xylem transport water and minerals
4.) What is the primary function of the leaf?
- The primary functions of the leaf is absorbing sunlight for producing the sugars as we know the process as photosynthesis. Another main function of leaves is transpiration, the process by which moisture is carried through plants from roots to small pores on the underside of leaves.
Picture from our plant Lab!
Friday, November 25, 2016
Why did your graph not quite start at 0 C?
Because the ice are mix with water, so the temperature is mix too (ice + water).
Where there any level sections in your graph? Why did they occur?
Yes, because there are level where felt-solid change to liquid, rest at liquid and flat-liquid change to gas.
Imagine you were able to capture all the steam produced when the water evaporated and measure its temperature as you continued to heat it. What do you think the temperature graph would look like?
I think the temperature graph continue increasing until all of the substance change to gas as all the steam were captured.