Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
Which of the following is NOT a key feature of specialised exchange surfaces?
thick, impermeable membranes
extensive blood supply and/or ventilation
thin walls
large surface area
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How does a high surface area to volume ratio affect the rate of diffusion?
it has no effect on the rate of diffusion
it depends on the organism's size
it increases the rate of diffusion
it slows down the rate of diffusion
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Which of the following organisms generally have a higher surface area to volume ratio?
neither larger nor smaller organisms
larger organisms
both larger and smaller organisms
smaller organisms
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Why can multicellular organisms NOT rely on diffusion across cell membranes to obtain all the substances they need?
(Select all that apply)
all cells are in direct contact with the external environment
diffusion distances between most cells and the environment are large
larger organisms require more oxygen and glucose
larger organisms have lower metabolic rates
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How do thin walls in specialised exchange surfaces aid in the diffusion of materials?
they maintain steep concentration gradients
they minimise the diffusion distance
they control what substances are exchanged
they increase the surface area
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What is the purpose of an extensive blood supply and/or ventilation in specialised exchange surfaces?
to maintain steep concentration gradients
to minimise the diffusion distance
to increase the surface area
to control what substances are exchanged
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Which of the following is a key feature of specialised exchange surfaces that helps control the exchange of substances?
large surface area
selectively permeable plasma membranes
thin walls
extensive blood supply and/or ventilation
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Which of the following is NOT an example of a substance that living organisms need to exchange with their environment?
glucose
oxygen
excretory products
enzymes
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How does the surface area to volume ratio affect the rate of exchange in living organisms?
a high surface area to volume ratio leads to slower exchange rates
the surface area to volume ratio does not affect exchange rates
a low surface area to volume ratio leads to faster exchange rates
a high surface area to volume ratio leads to faster exchange rates
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Which of the following statements about specialised exchange surfaces is TRUE?
they have thick walls to increase the diffusion distance
they have a small surface area to minimise the rate of diffusion
they are surrounded by selectively permeable plasma membranes to control substance exchange
they lack a blood supply or ventilation to maintain shallow concentration gradients
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