Question

stock and reserve resources example

Answer 1

Stock- Water in isolated form we do not have adequate technology to make it fit for drinking. - There is lot of oxygen in my area because many trees are present here so due to lack of technology we can't take oxygen gas and hydrogen gas to form a water molecule. 
Reserve- There is a dam few kilometres away from my town which has reserved water for future generations. - There are also some granaries which has reserved food grains for future generations.