Question

all of the statements about the nitrogen cycle are true except one. that is
lightning breaks nitrogen molecules so it can combine with oxygen
putting man - made fertilizers on farm fields exceeds natural nitrogen levels in the soil
bacteria located in the soil trap excess nitrogen and help to remove it from plant roots
although nitrogen is the most abundant atmospheric gas, plants cannot use it from the air.

5 multiple choice 10 points
which of the following statements about the nitrogen cycle is not true?
sev1c
animals get nitrogen by eating other plants or animals
plants create nitrogen in their roots
nitrogen moves back and forth between the atmosphere and living things
the air we breathe is mostly nitrogen

6 multiple choice 10 points
how does phosphorus move from the biotic to the abiotic areas during its cycle?
sev1c
primary consumers eat producers.
secondary consumers eat primary consumers.
bacteria on plant roots transfer it
decomposers break down the remains of producers and consumers.

7 multiple choice 10 points

Explanation:

Question 4

• Lightning can break \(N_2\) to combine with \(O_2\) (true).
• Man - made fertilizers can increase soil nitrogen beyond natural levels (true).
• Bacteria in soil (like denitrifying bacteria) remove excess nitrogen, but they don't trap it from plant roots; plants take up nitrogen, and excess is removed by bacteria through denitrification (this statement is false).
• Plants can't use atmospheric \(N_2\) directly (true). So the false statement is "bacteria located in the soil trap excess nitrogen and help to remove it from plant roots."

• Animals get nitrogen by eating plants/animals (true).
• Plants can't create nitrogen; they take up nitrogen in forms like nitrates/ammonium (false).
• Nitrogen cycles between atmosphere and living things (true).
• Air is mostly \(N_2\) (true). So the false statement is "plants create nitrogen in their roots."

• Primary consumers eating producers is about energy flow, not phosphorus movement from biotic to abiotic.
• Secondary consumers eating primary consumers is also energy flow.
• Bacteria on roots (like mycorrhizae) help with uptake, not moving to abiotic.
• Decomposers break down dead organisms (biotic) and release phosphorus back to the environment (abiotic). So the correct answer is "Decomposers break down the remains of producers and consumers."

Answer:

bacteria located in the soil trap excess nitrogen and help to remove it from plant roots

Question 5