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Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?
- a)Boil the leaf first in water and then in alcohol.
- b)Wash the bleached leaf.
- c)Add a few drops of iodine solution to the bleached leave.
- d)Heat the leaf on a hot flame.
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Harish wants to test the presence of starch in a leaf. Given below are...
To test the presence of starch in a leaf, the leaf should be boiled and not to burn.
This question is part of UPSC exam. View all Class 4 courses
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Harish wants to test the presence of starch in a leaf. Given below are...
Explanation:
In order to test the presence of starch in a leaf, several steps are involved. Let's go through each option and analyze its necessity.
a) Boil the leaf first in water and then in alcohol:
This step is necessary to remove the chlorophyll from the leaf. Boiling the leaf in water helps to soften the leaf tissue and remove any water-soluble pigments, while boiling it in alcohol removes the chlorophyll, making it easier to observe the presence of starch.
b) Wash the bleached leaf:
Washing the bleached leaf is important to remove any excess alcohol or other substances that may interfere with the subsequent testing. This step ensures the accuracy of the test.
c) Add a few drops of iodine solution to the bleached leaf:
Iodine solution is used to test for the presence of starch. Starch reacts with iodine to produce a blue-black color. Adding iodine to the bleached leaf allows us to observe if starch is present or not.
d) Heat the leaf on a hot flame:
This step is NOT necessary to test the presence of starch. Heating the leaf on a hot flame can cause it to burn or decompose, which may alter the results of the experiment. Starch can be detected without the need for heating.
Therefore, the correct answer is option 'D' - Heating the leaf on a hot flame is not necessary to test the presence of starch in a leaf.
In order to test the presence of starch in a leaf, several steps are involved. Let's go through each option and analyze its necessity.
a) Boil the leaf first in water and then in alcohol:
This step is necessary to remove the chlorophyll from the leaf. Boiling the leaf in water helps to soften the leaf tissue and remove any water-soluble pigments, while boiling it in alcohol removes the chlorophyll, making it easier to observe the presence of starch.
b) Wash the bleached leaf:
Washing the bleached leaf is important to remove any excess alcohol or other substances that may interfere with the subsequent testing. This step ensures the accuracy of the test.
c) Add a few drops of iodine solution to the bleached leaf:
Iodine solution is used to test for the presence of starch. Starch reacts with iodine to produce a blue-black color. Adding iodine to the bleached leaf allows us to observe if starch is present or not.
d) Heat the leaf on a hot flame:
This step is NOT necessary to test the presence of starch. Heating the leaf on a hot flame can cause it to burn or decompose, which may alter the results of the experiment. Starch can be detected without the need for heating.
Therefore, the correct answer is option 'D' - Heating the leaf on a hot flame is not necessary to test the presence of starch in a leaf.
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Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer?
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Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer? for Class 4 2024 is part of Class 4 preparation. The Question and answers have been prepared according to the Class 4 exam syllabus. Information about Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 4 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer?.
Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer? for Class 4 2024 is part of Class 4 preparation. The Question and answers have been prepared according to the Class 4 exam syllabus. Information about Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 4 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Harish wants to test the presence of starch in a leaf. Given below are the in striations to conduct the experiment. Which of the following step is NOT necessary?a)Boil the leaf first in water and then in alcohol.b)Wash the bleached leaf.c)Add a few drops of iodine solution to the bleached leave.d)Heat the leaf on a hot flame.Correct answer is option 'D'. Can you explain this answer?.
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