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Answers
Answer:
Q. 1
Ans= The presence of starch in leaves can be tested by the Iodine test. When we remove chlorophyll from the leaf by boiling it in alcohol and then put two drops of iodine solution, it is colour change to blue indicates the presence of starch.
Q. 2
Ans= Natural Fibers - Those fibers which are obtained from plants and animals are called natural fibers.
Example : wood , cotton , jute , moonj , silk , etc.
Synthetic Fibers - Those fibers which are made by human with chemicals are called artificial fibers.
Example : Rayon , Dacron , Nylon , etc.
Q. 3
Ans= A common task in chemistry labs is to identify whether a given solution is acidic, neutral or basic, which are determined by a solution's pH level.
A solution's pH will be a number between 0 and 14. A solution with a pH of 7 is classified as neutral. If the pH is lower than 7, the solution is acidic. When pH is higher than 7, the solution is basic. These numbers describe the concentration of hydrogen ions in the solution and increase on a negative logarithmic scale. For example, If Solution A has a pH of 3 and Solution B has a pH of 1, then Solution B has 100 times as many hydrogen ions than A and is therefore 100 times more acidic.
Answer :
presences of strach in leaves
Explaination :
take iodine solution
step by step :
1) A fresh leaf is taken.
2) The leaf is boiled in water for few minutes to soften the cells of the leaf.
3) Now, dip this in iodine solution.
4) The colour of the leaf will changes into dark blue or black colour when iodine solution is added to it.
5) It indicates that the presences of strach in leaf.
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