Experiment Flashcards
Investigating how light intensity affects the rate of photosynthesis EXPERIMENT
APPARATUS:
-test tube containing water
-a piece of water lamp
-a lamp
-a beaker in which you can stand the test tube
-a ruler for measuring the distance between -the lamp and the test tube
-a timer
METHOLD:
1) Place the lamp close to the test tube with the water plant inside
2)give the plant 5 minutes to settle down and start to photosynthesise. Start the experiment when you see bubbles coming from the end of plant stem
3) measure the distance between the lamp and the test down,write it down in your results chart
4)Start the timer.
5) Count how many bubbles the plant produces in 1 minute
6)Move the lamp a little bit further away from the test tube to measure the new distance
7) Repeat the process
Testing Leaf for a starch, how to find out if a leaf has been photosynthesising
Apparatus:
1) A healthy plant
2)A bunsen burner
3)A tripod
4) A gauze
5) A medium-sized beaker
6)A large test tube that can be safely heated
7)Some Ethanol
8) Tongs
9)Forceps
10)Iodine solution with a dropper
Safety Precautions:
1) You will be using hoy water, make sure to keep safe. Best to stand up while you work.
2) Careful to turn off the flame before you use any ethanol. Ethanol is very flammable
Method:
1) Put some water into your beaker. Stand the beaker on the tripod and gauze and heat it until starts to boil
2) Take a healthy leaf from the plant and carefully drop it into the boiling water
3)After 2 minutes, turn off the bunsen burner
4) Collect some ethanol in the large test tube
5)Use forceps to remove the leaf from the hot water into the ethanol in the test tube
6) Stand the test tube in hot water thats in the beaker. This will safely heat the ethanol
7) you will see green colour dissolve out of the leaf into the ethanol
8) When most of the green colour comes out from the leaf, use the forceps to gently take the leaf out of the tube
9)Spread the leaf onto a tile. Use the dropper to spread iodine solution over the leaf.
10) Leaf will go blue-black if it contains any starch
