what other ways might air be eliminated from the cup?

Question

Is too much air ever a problem to the farmer?
Would the same results occur with different types of seeds?
Plants make their food but they do need a supply of minerals. Choose three minerals and describe what happen to plant growing without them.
Give two reasons why anomals and plants need food.

Answer 1

why don't you do your homework by yourself?

http://en.wikipedia.org/wiki/Plant