Green plants absorb light in their leaves and convert it to energy by photosynthesis.
What is the correctly balanced equation for photosynthesis?
6CO2 + 6H2O -> C6H12O6 + 6O2
CO2 + H2O -> CH2O + O2
C6H12O6 + 6O2 -> 6CO2 + 6H2O
In a greenhouse, tomato plants grow faster if the temperature is increased. What does this show?
Temperature must be a limiting factor.
Light intensity must be a limiting factor.
Carbon dioxide concentration must be a limiting factor.
In an investigation into photosynthesis in a water plant, why are the number
of gas bubbles produced counted?
To see how fast the plant used up carbon dioxide.
To see how fast the plant produced oxygen.
To see how fast the plant produced starch.
Which tissue in the leaf absorbs the most light for photosynthesis?
Which tissue in the leaf is adapted for efficient gas exchange?
Why do leaves have a waxy cuticle?
To allow water vapour to diffuse out of the leaf.
To keep oxygen in the leaf.
To protect the leaf without blocking out light.
Which useful energy transfer happens in photosynthesis?
Light -> chemical
Chemical -> light
Light -> heat
Which statement describes an endothermic reaction?
A reaction that gives out energy.
A reaction that absorbs energy.
A reaction that does not involve energy.
How do you destarch a plant?
Place in bright light for 48 hours.
Place in the dark for 48 hours.
Remove all of the leaves.
Why is it necessary to remove any flame when using ethanol?
It is highly flammable.
It is corrosive.
It is harmful to the environment.