Homework Answers
ans 6-STATEMENT 4 IS CORRECT .
EXPLANATION :
STATEMENT 1
nitrogen is the most abundant gas in atmosphere . oxygen is the second most abundant gas in atmosphere the atmosphere. so statement one is wrong .
STATEMENT 2
single cell organisms exchange gases directly across cell membrane.however slow rate of diffusion of oxygen related to carbon di oxide limits size of single celled organisms .so rate of diffusion in single celled organisms is slower than thin cell .therefore statement 2 is also incorrect
STATEMENT 3
gas exchange in lungs takes place in millions of alveoli in lungs and capillaries therfore gas exchange takes place between alveoli and capillaries there the statement 3 is also wrong .
STATEMENT 4
the barrier between alveoli and capillaries are thin so diffusion takes place from higher partial pressure to lower partial pressure .therefore this statement 4 is right .
STATEMENT 5
fish use counter current mechanisms to maximise amount of oxygen that thier blood can keep up . they take this oxygen molecule frrom water therefore statement 5 is wrong .
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need for biological structures that allow efficient uptake of
oxygen and removal of carbon dioxide. Two types of structures that
have evolved for carrying out gas exchange are gills and lungs. The
table below lists organisms according to the type of structure they
use for gas exchange.
Describe the general process of gas exchange that occurs
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