Stomal Density

What does stomatal density refer to?

The number of stomata per unit area on the surface of a leaf.

What factors can cause variation in stomatal density?

Differences between plant species, varieties, and environmental conditions.

Measuring stomata density

1. How can a sample of epidermis be prepared to measure stomatal density?

By peeling off a sample of epidermis from the leaf, mounting it in water on a microscope slide, and examining it.

What is the purpose of using colourless nail varnish in measuring stomatal density?

To form a cast of the leaf surface that can be examined for stomatal counts.

What equation is used to calculate the diameter of the field of view under high power on a microscope?

Diameter (HP) = (diameter (LP) x magnification of LP objective) / magnification of HP objective.

What does a low standard deviation indicate about data reliability?

High reliability.

What is suggested by non-overlapping error bars in a graphical representation of data?

There may be a statistically significant difference between the levels of the independent variable.

Why is it important to control variables in an experiment measuring stomatal density?

To ensure that the results are fair and accurate, increasing the validity of the results.

What statistical measure is used to evaluate the consistency of data in an experiment?

Standard deviation.

How many repeat observations should be made to evaluate reliability in stomatal density measurements?

At least 5 repeat observations.