Question

1. When a plant photosynthesizes, the carbon used by the plant to construct organic molecules comes from

a. CO2 in the atmosphere

b. CO2 in the soil

c. Organic carbon in the soil

d. Single carbon atoms in the atmosphere

e. Any of these sources

2. CO2 in the atmosphere (choose all that apply)

I. Has increased in the last 100 years due to burning of fossil fuels

II. Has increased in the last 100 years due to deforestation

III. Has led to an overall increase in temperature on Earth

IV. Has lad to an increase in the amount of CO2 in the oceans

3. What is the LEAST likely way that phosphorus might enter a lake?

a. Fixation of atmospheric phosphorus gas

b. Erosion and weathering of phosphorus-containing rocks

c. Runoff from a nearby farm that uses fertilizer

d. Release of untreated sewage from a nearby city

Answer 1

Answer:

1). A). CO2 in the atmosphere

Explanation: Plant absorb CO2 from the atmosphere for the photosynthesis

2).

I. Has increased in the last 100 years due to burning of fossil fuels

II. Has increased in the last 100 years due to deforestation

III. Has led to an overall increase in temperature on Earth

3). a. Fixation of atmospheric phosphorus gas