3) Explain how you will measure the area of (i) a square (ii) a leaf?
Answers
Answer:
leaf
The area of a leaf is obtained by using a graph paper. A graph paper has small squares of each side 1 mm. The area of each big square is 1 cm2.
square
side*side
Explanation:
a) square
For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.
b) leaf
The rate of transpiration is measured as the amount of water lost/ square meter/ minute. Because water evaporates through the many stomata on the leaf surface, the rate of transpiration is directly related to the surface area. To arrive at the rate of transpiration, therefore, you must calculate the leaf surface area of each plant: Because most stomata are found in the lower epidermis, you will determine that surface area.
Lay the leaves to be measured on a 1-cm grid and trace their outlines.
Count the number of square centimeters. Estimate the area of the partial squares. (Here's a simple method for this estimate: Count a partial square if it is at least half covered by the leaf; do not count partial squares that are less than half covered.
Do not include the area of the stem (petiole) in your calculations.
eg:What is the surface area of this leaf in cm2?
Answer: This leaf has a surface area of approximately 14 cm2.