Photosynthesis - testing leaf for Starch

What is the aim of the practical experiment described?

• To find out if a leaf can float in water

• To identify if photosynthesis has occurred in the leaf of a plant

• To measure the size of a leaf

• To test a leaf for its color

What substance is tested for in the leaf to prove that photosynthesis has taken place?

• Carbon Dioxide

• Starch

• Oxygen

• Glucose

Which solution is used to test for the presence of starch in a leaf?

• Hydrochloric Acid

• Sodium Chloride

• Ethanol

• Iodine solution

Why is ethanol used in the experiment?

• To increase the temperature of the water

• To color the leaf green

• To remove the chlorophyll

• To make the leaf float

What is the first step in preparing the leaf for the starch test?

• Adding iodine solution to it

• Drying it with a paper towel

• Boiling it in water

• Placing it in ethanol

What happens to the color of iodine when it reacts with starch?

• It remains orange-brown

• It turns from red to green

• It turns from yellow to purple

• It turns from orange-brown to blue-black

Why is the leaf boiled in water during the experiment?

• To sterilize the leaf

• To make the leaf softer

• To change the leaf's color

• To break down the cell wall and membrane in the cells

What is the main reason for using a white tile in the experiment?

• To reflect light

• To hold the leaf while applying iodine

• To measure the leaf

• To keep the work area clean

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

• The leaf is dead

• The leaf is unhealthy

• Photosynthesis has occurred

• No photosynthesis has occurred