Table of Contents

- 1 How do you calculate the surface area of a leaf?
- 2 What predictions can you make about the number of stomata per mm2 and the rate of transpiration?
- 3 How do you calculate the rate of transpiration?
- 4 Why is it important to calculate the surface area of the leaf?
- 5 Do all plants have stomata is there any relationship between the number of stomata and the environment in which the plant species evolved?
- 6 What is the surface area of this leaf in cm2?
- 7 What are the units for rate of transpiration?

## How do you calculate the surface area of a leaf?

Leaf area (A) can be simply calculated by multiplying the product of leaf length (L) and width (W) by a constant (i.e., the Montgomery parameter; MP).

## What predictions can you make about the number of stomata per mm2 and the rate of transpiration?

What predictions/hypothesis can you make about the number of stomata per mm^2 and the rate of transpiration? If there are more stomata, the rate of transpiration will be greater.

**What is the area of the leaf?**

Approach: To calculate the area of the leaf, first find the area of the half leaf AECA, which can be given as: Area of half leaf = Area of quadrant AECDA – Area of right triangle ACD. Thus, Area of half leaf = ( PI * a * a / 4 ) – a * a / 2 where PI = 22 / 7 and a is the side of the square.

### How do you calculate the rate of transpiration?

The rate of transpiration can be calculated by measuring the distance travelled by an air bubble in a capillary tube over a given time. The faster the bubble moves, the greater the rate of water uptake – and so the greater the assumed rate of transpiration.

### Why is it important to calculate the surface area of the leaf?

Plants have a mechanism of regulating CO2 intake and water vapour escaping called transpiration. Hence, the leaf area helps to estimate the scope of transpiration process in a plant. Leave area measurement helps farmers and crop scientists to know how plants are adapting to the environment.

**Is the leaf surface area directly related to the rate of transpiration?**

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. Estimate the area of the partial squares.

## Do all plants have stomata is there any relationship between the number of stomata and the environment in which the plant species evolved?

No, not all plants transpire at the same rate as they don’t all have the same stomatal density. There is a relationship between the habitat in which plants evolved and their rate of transpiration as those in the shade transpire less and so do plants in hot, dry environments.

## What is the surface area of this leaf in cm2?

eg:What is the surface area of this leaf in cm2? Answer: This leaf has a surface area of approximately 14 cm2.

**How does leaf surface area affect transpiration rates?**

Internal factors that affect transpiration rates The leaf area influences the rate of transpiration. The wider the leaf area, the greater the rate of transpiration because wide leaves tend to have more stomata [5].

### What are the units for rate of transpiration?

In SI notation transpiration may be expressed as milligrams H2O per meter squared per second (mg’nr^s”1). For example, a transpiration rate of 5 ^g«cm”‘«s”1 would, in SI units, be expressed as 0.5 mg’irr^s”1. Water Relations.