4: Effect of sucrose concentration on pollen tube growth Flashcards
1
Q
Independent variable
A
sucrose concentration
2
Q
Dependent variable
A
Length of pollen tube in given time
3
Q
Variables to control
A
Temperature
Maturity of flower providing pollen
O2 availability
4
Q
Advantages of using pollen from ONE flower
A
- Improves validity of results because the maturity of the flower is controlled
This means any differences in results are more likely to be a result of sucrose concentration.
5
Q
Disadvantages of using pollen from ONE flower
A
Different results may arise if the experiment is repeated
Flowers may vary slightly in maturity
Genetic differences
Ideally the investigation would be repeated with a large number of flowers ( calculate mean)
6
Q
Why do you add a moistened filter paper in the Petri dish?
A
The humidity in the dish stops the pollen from DRYING out
7
Q
Why is there no coverslip on the slide?
A
To avoid ANOXIC conditions
