Iodine solution is used to test leaves for the presence of starch. You need to: … add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf – it turns white so it is easy to see the change in colour)
Why do we use a water bath to boil the leaf in alcohol?
We use water bath for boiling leaf in alcohol to remove the amount of chlorophyll present in it.
Is it necessary to use a water bath while boiling a leaf in alcohol during the activity to show sunlight is essential for plants justify your answer?
Answer: The use of water bath to boil alcohol is essential in the sense that alcohol has a very low boiling point, for this reason, if alcohol is exposed to fire, it can easily catch fire, therefore giving it a water bath is recommended.
Why is it necessary to boil leaf in water?
Why do we dip the leaf in boiling water? … It is very important to dip the leaves in boiling water before adding the iodine solution while conducting the starch test. This helps to get rid of the waxy cuticle that blocks the entry of iodine, damages cell membranes to form starch granules in cytoplasm and chloroplasts.
Why do you have to boil the leaf in water first before boiling it in alcohol ethanol?
Why do you have to boil the leaf in water first, before boiling it in alcohol/ethanol? The leaf is boiled in water first to soften the leaf tissue or to break the cell walls.
What happens when leaf is boiled in alcohol?
add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf – it turns white so it is easy to see the change in colour)
What is the importance of double boiling or indirect boiling of alcohol?
A double boiler provides gentle, indirect heat to whatever you are cooking. Rather than the heat of a burner transferring directly to the food, the heat is transferred to the water in the bottom pan and then through steam.
Why is the leaf boiled in alcohol in the experiment to show sunlight is necessary for photosynthesis?
In an experiment to show that ‘sunlight is necessary for photosynthesis’, the leaf is boiled in alcohol for few minutes using a water bath. It is essential because: (a) Alcohol is highly volatile. (b) Steam from the water bath heats the leaf rapidly.
Why alcohol is used to remove chlorophyll?
Do you know why chlorophyll can be removed from the leaf by ethanol? Ethanol is an organic solvent that causes the plant cells to become leaky. The chlorophyll inside the cells become available and dissolves in the ethanol.
Why is alcohol not heated directly to remove chlorophyll from the leaves?
Answer: alcohol is not directly heated to remove chlorophyll from the leaves because it is highly inflammable. so ,it is heated in a water bath beaker to remove chlorophyll.