Topic 6 - Environmental Factors And Rate Of Water Uptake

Question 1

What effect does an increase in temperature have on the rate of transpiration?

Answer 1

It results in faster molecular movement, increasing evaporation and the rate of transpiration.

Higher temperatures also enhance the rate of photosynthesis, leading to more open stomata.

Question 2

How does high relative humidity affect the rate of transpiration?

Answer 2

It decreases the rate of transpiration due to a reduced concentration gradient for diffusion.

High humidity means there is less difference between the concentration of water vapour inside and outside the leaf.

Question 3

What is the effect of increased air movement on transpiration?

Answer 3

It increases the rate of transpiration by creating a steeper concentration gradient.

Moving air lowers the concentration of water vapour around the leaf, enhancing diffusion.

Question 4

What relationship exists between light intensity and the rate of transpiration?

Answer 4

Increased light intensity leads to a higher rate of photosynthesis, resulting in more open stomata and increased transpiration.

More open stomata allow more water to evaporate.

Question 5

Fill in the blank: Increased __________ leads to faster molecular movement and higher rates of transpiration.

Answer 5

temperature

Question 6

True or False: High relative humidity increases the rate of transpiration.

Answer 6

False

Question 7

What happens to the rate of transpiration when the concentration of water vapour around the leaf decreases?

Answer 7

The rate of transpiration increases due to a steeper concentration gradient.

This is often caused by increased air movement.