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Question
Define the term:
Guttation
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Solution
Guttation is defined as the loss of water in the form of water droplets from the leaves of intact plants. It is also called exudation.
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A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. It was then set up as shown in the diagram and exposed to light for about 12 hours. At the end of this time, leaf x and y were tested for starch. Study the diagram and answer the questions that follow:
(i) Why was the plant initially kept in darkness for 24 hours?
(ii) What is the function of sodium hydroxide solution in the flask?
(iii) Select the correct leaf from the five available choices shown in the diagram as a, b, c, d and e. Rewrite the correct answer by filling in the appropriate letter for the questions that follow:
1. After the starch test, leaf x would look like ______.
2. After the starch test, leaf y would look like ______.
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Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.

What is the purpose of the spring balance in the set-up?
Guard cells are responsible for the opening and closing of stomata.
Identify the wrong statement and correct it.
Leaves perform the function of transpiration only.
Why is transpiration called a necessary evil?
Observe the diagram and answer the following;
![]() (i) |
![]() (ii) |
- Are these types of guard cells found in monocots or dicots?
- Which of these shows a higher water content (i) or (ii)?
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