(D) The iodine test is a chemical test used to detect the presence of starch in a sample.When iodine solution ($I_2$ in $KI$) is added to a substance

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(D) The iodine test is a chemical test used to detect the presence of starch in a sample.When iodine solution ($I_2$ in $KI$) is added to a substance containing starch,it forms a starch-iodine complex,which results in a characteristic blue-black colour.Since rice water turned blue-black upon the addition of iodine,it confirms the presence of starch in the rice water.Therefore,the correct option is $D$.

Class 10 Science Life Processes Mix Examples - Life Processes

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$A$ few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

A
complex proteins
B
simple proteins
C
fats
D
starch

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$A$ few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

Similar Questions

If a plant is releasing carbon dioxide and taking in oxygen during the day,does it mean that there is no photosynthesis occurring? Justify your answer.

$(a)$ State two functions of bile juice.$(b)$ Differentiate between the functions of enzymes pepsin and trypsin.

Bile is an alkaline fluid produced by the liver and stored in the gall bladder.

What is $translocation$? Why is it essential for plants? Where in plants are the following synthesized:$(i)$ Sugars$(ii)$ Hormones

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$(a)$ State two functions of bile juice.
$(b)$ Differentiate between the functions of enzymes pepsin and trypsin.

What is $translocation$? Why is it essential for plants? Where in plants are the following synthesized:
$(i)$ Sugars
$(ii)$ Hormones

$(a)$ Name the protein-digesting enzyme present in pancreatic juice and the hormone secreted by the pancreas.
$(b)$ What is the function of pancreatic juice?