Petri dish Why 44 니라
Seedlings
Filter paper with
10 mm x 10 mm grid
Beaker
Auxin solution
measured
.
All five beakers were placed inside a dark cupboard for three days.
After three days the increase in the length of each plumule was
The average increase in length of the plumule in each beaker was
calculated and recorded in the table below.
The table below shows the results of the investigation after three days.
BEAKER
NUMBER
1
2
3
4.
5
AUXIN CONCENTRATION
IN PARTS PER MILLION
(ppm)
0,1
1
10
50
100
AVERAGE INCREASE
IN PLUMULE LENGTH
(mm)
1,5
3,2
4,8
2,3
0
3.2.1
For this investigation identify the
(a) Independent variable
(b) Dependent variable
3.2.2
State the purpose of the grid that was placed inside each petri dish.​

the independent variable is the auxin concentration

the dependent variable is the plumule length increase

the purpose of the grid was to provide an easy and accurate way to measure the length of the plumule specimens

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.