What is the light-absorbing green pigment found in the chloroplasts called?
Cytoplasm
Sap
Chlorophyll
Which gas is a reactant (used) in photosynthesis?
Carbon monoxide
Carbon dioxide
Oxygen
Which of these is a limiting factor of photosynthesis?
Oxygen concentration
Temperature
Glucose concentration
What happens to the glucose made in photosynthesis in the plant?
It is released as a by-product
It is used in respiration
It is stored as glycogen
What is the name of the chemical used to test for starch?
Iodine solution
Biuret reagent
Benedict’s solution
What colour indicates a positive test for starch using iodine solution?
Brick red
Blue-black
Purple
Which step in the method for testing a leaf for starch removes chlorophyll from the leaf?
Step 1 – boiling in water
Step 2 – boiling in ethanol
Step 3 – washing the leaf with water
A lack of what in some parts of a variegated leaf makes it useful for investigating photosynthesis?
Stomata
Cell walls
Why is it preferable to heat ethanol in a beaker of boiling water rather than over a Bunsen burner flame?
Ethanol is flammable
Ethanol might spill onto the floor
Ethanol might splash into your eyes
What is the name of the chemical used to absorb carbon dioxide from the air in photosynthesis experiments?
Sodium bicarbonate
Sodium chloride
Sodium hydroxide