First Half Term Y8 Pratice Questions

Question 1

Amy’s plan
-add some pollen grains to one drop of very concentrated sugar solution
-add some pollen grains to one drop of dilute sugar solution.
-count how many pollen grains have started to grow
Tom’s plan
-add one drop of different concentrations (0% 5% 10% 15% 20% 25%) of sugar solution to each slide.
-add the same amount of pollen to each drop
-one hour later count hoe many pollen grains have started to grow.
Give to ways why toms plan is better!!!

Answer 1

1. Toms is more detailed

2. Toms tests a scientific question

Question 2

Amy’s plan
-add some pollen grains to one drop of very concentrated sugar solution
-add some pollen grains to one drop of dilute sugar solution.
-count how many pollen grains have started to grow
Tom’s plan
-add one drop of different concentrations (0% 5% 10% 15% 20% 25%) of sugar solution to each slide.
-add the same amount of pollen to each drop
-one hour later count hoe many pollen grains have started to grow.
What is the independent variable in toms plan?

Answer 2

The sugar

Question 3

Amy’s plan
-add some pollen grains to one drop of very concentrated sugar solution
-add some pollen grains to one drop of dilute sugar solution.
-count how many pollen grains have started to grow
Tom’s plan
-add one drop of different concentrations (0% 5% 10% 15% 20% 25%) of sugar solution to each slide.
-add the same amount of pollen to each drop
-one hour later count hoe many pollen grains have started to grow.

The graph
When 0 sugar 0 pollen
When 5 sugar 30 pollen 
when 10 sugar 100 pollen 
When 15 sugar 30 pollen
When 20 sugar 10 pollen
When 25 sugar 0 pollen

Tom’s conclusion was “the greater the concentration of sugar the greater percentages of pollen grains had grow”
Is he right yes/no and explain

Answer 3

No because after 10 sugar it went down in pollen again.