TRANSPIRATION

Question 1

Define transpiration

Answer 1

The process of loss of water in the form of water vapour from the leaves and other aerial parts of the plant

Question 2

Name an indicator of moisture used in experiments that demonstrate transpiration

Answer 2

Cobalt chloride paper

Question 3

What is the colour of a colbalt chloride paper when it is dry?

Answer 3

blue

Question 4

What is the colour of a colbalt chloride paper when it is moist?

Answer 4

Pink

Question 5

How to measure transpiration?

Answer 5

1. weighing method
2. potometer method

Question 6

What is a potometer?

Answer 6

It is a device that measures the rate of water intake by the plant
Water intake = water lost by transpiration

Question 7

What are the precautions to be taken in the use of ganong’s potometer?

Answer 7

1. The potometer must be airtight
2. The twig should be cut obliquely, under the water

Question 8

What are the limitations in the use of ganong’s potometer?

Answer 8

1. it is not easy to introduce the air bubble
2. the twig may not remain fully alive for a long period of time
3. changes in the outside temperature may affect the air bubble’s position

Question 9

What are the 3 types of transpiration?

Answer 9

1. stomatal
2. lenticular
3. cuticular