science
Grade-2
Easy
Question
The experiment given below is performed to show that:
- Sunlight is not needed for the plant
- Water is not needed for the plant
- Sunlight is needed for the plant
- Water is needed for the plant
Hint:
Only the areas that have been exposed to light will photosynthesize and therefore test positive for starch, showing that light is necessary for photosynthesis.
The correct answer is: Sunlight is needed for the plant
- Take a plant with a detached leaf. The leaf is partially covered with black paper on which a design is cut. Expose this plant to sunlight for a few hours and perform a starch test with an iodine solution.
- Only the areas that have been exposed to light will photosynthesize and therefore test positive for starch, showing that light is necessary for photosynthesis.
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