AP Biology : Understand inputs and outputs, purpose
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Example Question #1 : Understand Inputs And Outputs, Purpose
Which of the following is not a reactant used in the process of photosynthesis?
O2
Light energy
H2O
CO2
O2
The process of photosynthesis can be summarized by the following equation.
H2O, CO2, and light energy are thus reactants of photosynthesis, while O2 is only a product.
Example Question #1 : Understand Inputs And Outputs, Purpose
What are the products of photosynthesis?
Light and glucose
Oxygen and carbon dioxide
Glucose and oxygen
Carbon dioxide and light
Water and carbon dioxide
Glucose and oxygen
The photosynthesis equation can be written as:
From this equation, we can see that plants take in carbon dioxide, water, and light energy as reactants and produce glucose and oxygen as products.
Example Question #2 : Understand Inputs And Outputs, Purpose
Some organisms, such as green plants, are capable of obtaining energy directly from photosynthesis. These organisms are termed __________.
autotrophs
homotrophs
heterotrophs
herbivores
primary consumers
autotrophs
Autotrophs are organisms that produce complex organic compounds from substances present in the surroundings. These organisms may do this through the use of energy from light or from inorganic chemical reactions.
In contrast, heterotrophs require organic input in order to generate biological compounds and are unable to use light or inorganic materials for energy.
Example Question #2 : Understand Inputs And Outputs, Purpose
Which of the following is true of photosynthesis?
The process requires no energy
Electrons decrease in potential energy as they move from water to sugar
Carbon dioxide is reduced
Water is reduced
Carbon dioxide is oxidized
Carbon dioxide is reduced
Photosynthesis occurs in the chloroplasts of plant cells, where carbon dioxide is reduced and water is oxidized to create sugar. During this process electrons demonstrate increased potential energy as they move from water to sugar. The process requires an initial energy input, derived from photons.
Example Question #3 : Understand Inputs And Outputs, Purpose
Organisms that make their organic molecules from inorganic raw materials obtained from the surrounding environment are called __________.
autotrophs
plants
auxotrophs
heterotrophs
autotrophs
Autotrophs create organic material from inorganic materials. Autotrophs are self-feeders in that they do not consume other organic materials but rather create their own organic materials. Plants and other photosynthetic organisms are examples of autotrophs.
Example Question #4 : Understand Inputs And Outputs, Purpose
Plants are an example of which of the following categories of organisms?
Chemoautotrophs
Autotrophs
Heterotrophs
Biosphere consumers
Autotrophs
Plants are an example of autotrophs. Autotrophs sustain themselves without consuming other organic material. Instead they create organic material from inorganic materials.
Example Question #5 : Understand Inputs And Outputs, Purpose
Which of the following are referred to as the major sites of photosynthesis in most plants?
Stems
Roots
Flowers
Leaves
Leaves
The leaves are the major sites of photosynthesis in most plants. The chloroplasts are located in the mesophyll—interior tissues of the leaves—and are the primary sites of photosynthesis.
Example Question #6 : Understand Inputs And Outputs, Purpose
Photosynthesis is commonly divided into how many primary stages?
Two stages
Four stages
One stage
Three stages
Two stages
The correct answer is two major stages. The first stage is known as the light reactions where solar energy is converted to chemical energy. The second stage is the Calvin cycle that synthesizes sugar.
Example Question #5 : Understand Inputs And Outputs, Purpose
Which of the following is one of the end products of photosynthesis?
Water
Glucose
Lipids
Carbon dioxide
Glucose
Glucose is the six carbon sugar that is the main product of photosynthesis. Water and carbon dioxide are the reactants in photosynthesis. Lipids are fat molecules that store energy in cells.
Example Question #8 : Understand Inputs And Outputs, Purpose
Which of the following is not true regarding photosynthesis?
Carbon dioxide is a reactant
Glucose is a product
Water is a product
It is a nonspontaneous reaction
Water is a product
In photosynthesis, water, carbon dioxide, and energy in the form of sunlight are inputs, and the outputs are glucose and oxygen. A nonspontaneous reaction is one that will not proceed without the net input of energy (in this case, sunlight).
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