The biomass of a tree is composed mainly of wood, which is the carbohydrate called cellulose. If an oak tree gained 15kg of biomass in a year, what its he main source of the biomass?

A. h20 from the air
B. CO2 from the air
C. solar energy
D. minerals from the soil
E. h20 from the the soil

Question

The biomass of a tree is composed mainly of wood, which is the carbohydrate called cellulose.  If an oak tree gained 15kg of biomass in a year, what its he main source of the biomass?

A. h20 from the air
B. CO2 from the air
C. solar energy
D. minerals from the soil
E. h20 from the the soil

anonymous · Answer

These two are just plain wrong in any instance.
1) A. h20 from the air 
2) B. CO2 from the air

Let's try to break it down plausible options, What does something need for growth... a surplus of energy, you should review the cycle of photosynthesis and you'll find your answer.

anonymous · Answer

so is it h20 from the air

anonymous · Answer

No, those two 1) & 2) and plain out wrong statements, as far as i know plants don't utilize H2O from the air.

anonymous · Answer

i meant soil sorry

anonymous · Answer

Im not an expert on plants, but i believe the growth has more to do with solar energy since, they convert solar energy into cellular energy.

anonymous · Answer

C02 is utilized in the process of photosynthesis to form sugars/carbon compounds. The Calvin cycle occurs in the chloroplast and carbon from carbon dioxide is fixed and reduced to sugar.
Photons energy from the sunlight is absorbed and by the chlorophyll a in the photo-systems I and II. The energy is used for the excitation of electron.
Oxygen released in photosynthesis comes from the water. Water is Hydrogen is produced from the photolysis of water in the light independent reaction. This hydrogen is then used for reduction of NADP TO NADPH2. and CO2 is then reduced in the light independent reactions.

anonymous · Answer

so b?

anonymous · Answer

most probably, yes

anonymous · Answer

more than 90% of the mass of plants come from the atmosphere

anonymous · Answer

I mean dry mass, because depending on the plants, there can be a lot of water.

anonymous · Answer

Well i stand corrected, and this reinforce my resolute that i shall avoid commenting on questions concerning plantlife. Thank you for correcting me.

anonymous · Answer

A famous teacher said "you can't make progress unless you make a mistake"
By the way I'm not sure to be right with the previous statements I wrote.