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Comparative study of rates of rates of transpiration in the upper and lower surfaces of leaf, using four-leaf experiment

 

Practical Notebook Biology Standard XII

Biology 

Answeres

Practical Notebook
Standard XII

Class-12th

science

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Practical Notebook Biology Standard XII


Practical Notebook Biology Standard XII

Practical Notebook Biology Standard XII

Practical Notebook Biology Standard XII

B. DEMONSTRATION EXPERIMENTS

1. Comparative study of rates of transpiration in the upper and lower surfaces of the leaf, using four-leaf experiment.  7 Loss of excess water in the form of vapor through the aerial parts of the plant is called transpiration.  Aim: To study the comparative rate of transpiration in the upper and lower surfaces of a leaf by conducting four-leaf experiments.  

Requirements: - 

Two stands, thread, four leaves of Calotropis / banyan tree, Vaseline (petroleum jelly), etc.  Fig.  Comparison of transpiration, a demonstration by four-leaf experiment Apply Vaseline to leaf surface in the following manner, 

1. Leaf A: - Petroleum jelly is applied on both surfaces 

Figure: Procedure: 

The leaves selected should be healthy preferably of the same size and showing growth.  Tie the different leaves of the same plant with thread in such a way that they will be equidistant and surfaces will be properly exposed to the sunlight.  Tie the thread to the stand at both ends.  2.  3 41 

2. Leaf B: - Petroleum jelly is applied on the lower surface only.  

3. Leaf C: - Petroleum jelly is applied on the upper surface only 

4. Leaf D: - Petroleum jelly is not applied and then prepare observation table.  

Observe the order of drying of these leaves, 2-3 days after setting off the apparatus Observation table: Sr.  1 Type of leaf Leaf A Leaf B Leaf C Leaf D 69 Observation leaf is fresh and not yet dried leaf look fresh but Silighting dixie leaf is dried or willed portly Ileat is willed completely.


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