1. describe how nighttime carbon dioxide concentrations near the forest should compare with the midday

concentrations near the forest. explain your answer using two biological processes.

carbondioxide concentration is high at  night, and low during the midday.

Explanation:

This can be explained with the PHOSYNTHESIS and RESPIRATION (cellular respiration).

Photosynthesis is the process of manufacturing of food substances by plants, bacteria and some other organisms. These organisms use energy in sunlight to combine carbondioxide and water, in the presence of the green pigments (chlorophyll in leaves) and enzymes to form GLUCOSE and OXYGEN. Glucose is the main end product (digested food in plants.)The oxygen is for other organisms including man, and plants to breathe in.  

                                                SUNLIGHT

         C02 + H2 0                       >      C6 H 12 06   + Oxygen

                                               Chlorophyll      

Sunlight is needed to breakdown   oxygen and protons in water molecules. This is the source of oxygen molecules in photosynthesis that we human and other animas take in. The hydrogen is needed for glucose production.

Therefore during the midday, the concentrations of CO2 at midday near the forest   is always low because plants continuously use these for photosynthesis, by removing it from atmosphere.

However, at night time   C02 concentration near the forest is always high. This is because at night, the rate photosynthesis drops because there is no sunlight. But plant undergo respiration by breaking down the glucose manufactured during (phosynthesis) by combining it with oxygen to produce carbondioxide, and water vapour. This increases C02 concentrations at night.  

       Glucose + Oxygen    > Carbondioxide and Water

          C6 H 12 06 + 602             > 6C02 + 6H 0