Plant Tissues

1) The Haber-Bosch process creates nitrogenous fertilizers by:

A) extracting reactive nitrogen from soils.

B) extracting nitrogen oxides from the gases produced when fossil fuels are burned.

C) converting nitrogen gas and hydrogen to ammonia.

D) allowing vegetative detritus to break down under anaerobic conditions.

2)Which one of the following statements about the carbon, phosphorus, and nitrogen cycles is true?

A) The major source of carbon used by plants is the soil.

B) The major source of nitrogen used by plants is rock.

C) Phosphorus has no atmospheric component.

D) Bacteria drive the phosphorus cycle.

3) On land, the carbon used today in photosynthesis to form carbon atoms of plant tissues is mostly returned to the air because of:

A) respiration in plants, animals, and organisms in the soil.

B) plate tectonics.

C) additional photosynthesis in the same plants.

D) erosion, decay, and general weathering.

4) Ultimately, the sunlight energy that strikes Earth is:

A) stored permanently in minerals and rocks deep within the oceans.

B) stored permanently in molecules that are located deep within the Earth.

C) eventually lost into space as heat.

D) converted to potential energy and stored in animals and plant tissues permanently.