the correct answer is a. male gametophyte
the food contains a sugar called glucose, which is broken down in a process called cellular (respiration ). this process uses (oxygen) to break down food molecules and provide energy for cells.
cellular respiration refers to the set of biochemical reactions take place in a cell in order to convert the energy of glucose into adenosine triphosphate (atp).
the biochemical reactions involved are:glycolysis pyruvate decarboxylation krebs cycle electron transport chain oxidative phosphorylation
it consumes oxygen and releases atp, water, and carbon dioxide (byproduct).
c₆h₁₂o₆ + 6o₂ → 6co₂ + 6h₂o + atp
the difference between topsoil and garden soil is an even finer distinction than the difference between soil and dirt, and it has to do with the amount of organic matter, and to a lesser extent, the types of trace minerals and the ratio of clay, sand and silt. garden soil is a category of topsoil