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