Biology
Which of the following chemicals is used to identify the presence of starch ?
- Lime water
- Potassium hydroxide
- Iodine solution
- Methylated alcohol
Answer
Iodine solution
Reason — The chemical used to identify the presence of starch is Iodine solution.
Lime water is used to test for carbon dioxide. It turns milky in its presence, but it does not detect starch. Potassium hydroxide is a strong base used in various chemical reactions, but it is not used for starch detection. Methylated alcohol is used as a solvent or disinfectant, not for testing starch.
Related Questions
Which of the following is an end product of anaerobic respiration in plants ?
- Ethane
- Ethylene
- Ethanol
- Lactic acid
A glowing matchstick starts burning in the presence of :
- Carbon dioxide gas
- Nitrogen gas
- Carbon monoxide gas
- Oxygen gas
Assertion (A): Green plants are autotrophs and they use carbon dioxide and water as raw materials to prepare their own food.
Reason (R): Chlorophyll and sunlight are also essential in the process of photosynthesis but they are not utilized as raw materials.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Stomata are tiny openings found mainly on the lower surface of the leaves.
Reason (R): They cannot be opened or closed for the process of photosynthesis when exposed to direct sunlight as guard cells become inactive in direct sunlight.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.