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(a) To drive out or expel oxygen
(b) To avoid killing yeast cells or denaturing enzymes in yeast.
(c) To prevent air (especially oxygen) from getting into the glucose and yeast suspension
(d) Lime water forms a white precipitate, bubbles are formed
(e) Used boiled yeast on glucose
johnmulu answered the question on May 4, 2017 at 08:04
- The diagram below represents some gaseous exchange structures in humans.(Solved)
The diagram below represents some gaseous exchange structures in humans.
(a) Name the structure labeled K, L and M.
(b) Name the process by which inhaled air moves from the structure labeled L into blood capillaries
(c) Give the scientific name of the organism that causes tuberculosis in humans
Date posted: May 4, 2017. Answers (1)
- (a) Name two structures for gaseous exchange in aquatic plants
(b) What is the effect of contraction of the diaphragm muscles during breathing in mammals? (Solved)
(a) Name two structures for gaseous exchange in aquatic plants
(b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
Date posted: May 4, 2017. Answers (1)
- The diagram below illustrates a blood capillary surrounding a structure for gaseous exchange in human beings (Solved)
The diagram below illustrates a blood capillary surrounding a structure for gaseous exchange in human beings
(a) Name the gases exchange structure.
(b) Identify the gases labelled Y and Z.
(c) How does cigarette smoking lead to lung cancer
Date posted: May 4, 2017. Answers (1)
- How is a guard cell structurally adapted for gaseous exchange? (Solved)
How is a guard cell structurally adapted for gaseous exchange?
Date posted: May 4, 2017. Answers (1)
- Explain each of the following: (i) The tracheoles lack spiral bands of chitin; (ii) The floor of the mouth is lowered during inhalation in a bony fish. (Solved)
Explain each of the following: (i) The tracheoles lack spiral bands of chitin; (ii) The floor of the mouth is lowered during inhalation in a bony fish.
Date posted: May 4, 2017. Answers (1)
- The diagram below shows the gaseous exchange system of a locust. (Solved)
The diagram below shows the gaseous exchange system of a locust.
(a) Name the structure labelled Q.
(b) State the function of the part labeled R.
(c) How is the part labeled S structurally adapted tom its function?
Date posted: May 4, 2017. Answers (1)
- The diagram below represents a model used to demonstrate breathing in mammals. (Solved)
The diagram below represents a model used to demonstrate breathing in mammals.
(a) Name the mammalian structure represented by the parts labeled D and E.
(i) D (ii) E
(b) State the observation made when the string is pulled downwards
(c) Explain the observation in (b) above
Date posted: May 4, 2017. Answers (1)
- How are lenticels adapted for gaseous exchange? (Solved)
How are lenticels adapted for gaseous exchange?
Date posted: May 4, 2017. Answers (1)
- The diagram below represents part of the gaseous exchange system in human. (Solved)
The diagram below represents part of the gaseous exchange system in human.
(a) Name the parts labelled F and G.
(b) State one function of each of the parts labelled H and J
Date posted: May 4, 2017. Answers (1)
- (a) Name the causative agents for the following respiratory diseases. (i) Whooping cough. (ii) Pneumonia
b) How are the pneumatophores adapted to their function? (Solved)
(a) Name the causative agents for the following respiratory diseases. (i) Whooping cough. (ii) Pneumonia
b) How are the pneumatophores adapted to their function?
Date posted: May 4, 2017. Answers (1)
- State the difference in content of oxygen and carbon (IV) oxide in the air that enters and leaves the human lungs(Solved)
State the difference in content of oxygen and carbon (IV) oxide in the air that enters and leaves the human lungs
Date posted: May 4, 2017. Answers (1)
- Apart from the lungs, name two gaseous exchange surface in a frog.(Solved)
Apart from the lungs, name two gaseous exchange surface in a frog.
Date posted: May 4, 2017. Answers (1)
- (a) Name the gaseous exchange surface in insects.
(b) How is the surface named in (a) above suited to its function. (Solved)
(a) Name the gaseous exchange surface in insects.
(b) How is the surface named in (a) above suited to its function.
Date posted: May 4, 2017. Answers (1)
- State four characteristics of gaseous exchange surfaces.
(Solved)
State four characteristics of gaseous exchange surfaces.
Date posted: May 4, 2017. Answers (1)
- The diagram below represents some gaseous exchange structures in humans
(Solved)
The diagram below represents some gaseous exchange structures in humans
a) Name the structures labeled K, L and M.
b) Name the process by which inhaled air moves from the structure labeled L into blood capillaries
c) Give the scientific name of the organism that causes tuberculosis in humans
Date posted: May 3, 2017. Answers (1)
- a) Name two structures for gaseous exchange in aquatic plants (b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?(Solved)
a) Name two structures for gaseous exchange in aquatic plants
b) What is the effect of contraction of the diaphragm muscles during breathing in mammals?
Date posted: May 3, 2017. Answers (1)
- State four ways in which respiratory surfaces are suited to their function(Solved)
State four ways in which respiratory surfaces are suited to their function
Date posted: May 3, 2017. Answers (1)
- State two ways in which floating leaves of aquatic plants are adapted to gaseous exchange.(Solved)
State two ways in which floating leaves of aquatic plants are adapted to gaseous exchange.
Date posted: May 3, 2017. Answers (1)
- The diagram below represents a part of the rib cage.(Solved)
The diagram below represents a part of the rib cage.
(a) Name the parts labeled W, Y and Z.
b) How does the part labeled Z facilitate breathing in?
Date posted: May 3, 2017. Answers (1)
- The diagram below shows gaseous exchange tissues (Solved)
The diagram below shows gaseous exchange tissues
(a) Name the gas that diffuses:
(i) To the body cells
(ii) From the body cells
b) Which compound dissociate to release the gas named (a) (i) above
c) Name the blood vessel with the highest concentration of:
i) Glucose
ii) Carbon (IV) oxide
Date posted: May 3, 2017. Answers (1)