Starch Photosynthesis

What is the purpose of using a variegated leaf in the starch test?

• To observe the leaf's natural color

• To test the leaf's resistance to heat

• To compare areas with and without chlorophyll

• To measure the leaf's water content

Tags

NGSS.MS-LS1-6

What safety equipment is necessary for this experiment?

• Safety spectacles

• Thermal gloves

• Waterproof boots

• Laser goggles

Why is the leaf boiled in water during the experiment?

• To extract natural sugars

• To denature enzymes and halt photosynthesis

• To purify the leaf from impurities

• To increase the leaf's absorption of iodine

Why is the leaf boiled in water before treating it with ethanol?

• To extract essential oils

• To prepare it for cooking

• To soften the leaf and denature enzymes

• To clean the leaf

What is the role of ethanol in this experiment?

• To enhance the leaf's green color

• To dissolve the chlorophyll

• To act as a catalyst in photosynthesis

• To preserve the leaf's structure

Why is it important to remove chlorophyll before testing for starch?

• To increase the leaf's permeability

• To prevent color interference in the test results

• To enhance the flavor of the leaf

• To reduce the leaf's weight

How long is the leaf left in boiling ethanol?

• 30 seconds

• 10 minutes

• 2 minutes

• 5 minutes

What does the presence of starch in certain areas of the leaf indicate?

• That the leaf is healthy and alive

• That the leaf has absorbed water

• That the leaf is suitable for consumption

• That photosynthesis occurred in those areas

Tags

NGSS.HS-LS1-5

What is the significance of the iodine solution in the experiment?

• It tests for the presence of starch

• It enhances photosynthesis

• It colors the leaf to make it more visible

• It acts as a preservative

What does the change in color to black when iodine is applied indicate?

• Presence of proteins

• Presence of starch

• Presence of fats

• Presence of sugars