Photosynthesis and Starch Detection

The video tutorial explains the process of photosynthesis and how plants produce glucose and oxygen. It guides viewers through an experiment to detect starch in plant leaves. The necessary materials include a Bunsen burner, ethanol, and iodine solution. The experiment involves boiling a leaf, decolorizing it with ethanol, and testing it with iodine. The leaf turns blue-black, indicating the presence of starch. This experiment demonstrates the role of sunlight in starch formation in leaves.

What are the two main products of photosynthesis?

• Glucose and carbon dioxide

• Starch and oxygen

• Glucose and oxygen

• Oxygen and water

Which of the following is NOT required for the starch detection experiment?

• Bunsen burner

• Tripod stand

• Petri dish

• Thermometer

Why is it important to select a leaf that has been exposed to sunlight?

• Sunlight makes the leaf more permeable

• Sunlight is necessary for starch formation

• Sunlight helps in the formation of chlorophyll

• Sunlight decolorizes the leaf

What is the purpose of boiling the leaf in water?

• To remove chlorophyll

• To soften the leaf tissues

• To break cell membranes and walls

• To decolorize the leaf

What role does ethanol play in the experiment?

• It decolorizes the leaf

• It softens the leaf tissues

• It breaks cell membranes

• It acts as an indicator

Why is the leaf placed back in hot water after ethanol treatment?

• To remove any remaining chlorophyll

• To soften the leaf tissues

• To make the leaf more permeable

• To prepare the leaf for iodine application

What is the purpose of adding iodine to the leaf?

• To indicate the presence of starch

• To soften the leaf tissues

• To decolorize the leaf

• To break cell membranes

What color change indicates the presence of starch in the leaf?

• Yellow to green

• Blue to red

• Colorless to blue-black

• Green to yellow

What conclusion can be drawn if the leaf turns blue-black after iodine application?

• The leaf contains chlorophyll

• The leaf is permeable

• The leaf contains starch

• The leaf is decolorized