Test Mode
Reading Mode
Right = 0
Wrong = 0
Show surprise of disapproval
Show agreement
Show happines
Show indifference
the marriage guest
the mariner
Death's female companion
Death
has not ordered expensive dishes
has eaten too much
has left a meager tip for the writer
was vindictive man
she had big stupid hands
she sent Jerry Skates
she was starving
she lived away form Jerry
song of the evening
evening religious service
nursery song
a melancholy
a song full of praise
a minister's praise
a sad song
a court poet's song
About fifty years ago, plant physiologists set out to grow roots, by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require the energy of course. The process of respiration uses sugar to make the high-energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen.
Promotion
Download Our Mobile Apps
