Kowloon Tong School (Secondary Section)
F.2 Integrated Science
Experiment Worksheets 6
Name: _________________ ( ) Date:
__________________
Class: 2 _______
Experiment
7.5A: Gaseous exchange氣體交換 of mealworms麥皮蟲 grasshopper草蜢 (P.48-50)
Objective: To study the gaseous
exchange of mealworms in bright and dark conditions.
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1.
Study the design of set-up C as shown below.
What condition does set-up
C simulate模擬, compared with set-up A?
Set-up C simulates the
condition at night (in the daytime / at night) while
set-up A simulates the
condition in the day time (in the daytime / at night).
2.
Set up a control
experiment對照實驗 for set-up C. Draw a
labelled diagram to show it and call it set-up D below.
3.
Prepare set-ups C and D. Repeat step 2 with them.
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Discussion:
(a) Explain the results in set-up A.
The mealworms
grasshopper takes in oxygen from
the air in the boiling tube and releases carbon dioxide.
Soda
lime absorbs carbon dioxide from the air in the boiling tube.
The total amount of the gas inside the boiling tube
decreases
(increases / decreases).
As a result, the red ink marker moves towards
(towards / away from) the boiling tube.
(b) What is the use of set-up B?
There is no mealworm grasshopper
in set-up B. If there is any change
in the position of its red ink marker, it means there are changes in other
factors, e.g. temperature and air pressure. These factors
will also (not
/ also) affect set-up A.
By comparing the results in set-ups A
and B, we can know the actual effect真正影響 brought
about by the
mealworms in
set-up A. Set-up B is known as the control
experiment for set-up A.
(c) Explain the results in set-up C.
The mealworms
grasshopper takes in oxygen from
the air in the boiling tube and releases carbon
dioxide.
Soda
lime absorbs carbon dioxide.
The total amount of the gas inside the boiling tube
decreases.
As a result, the red ink marker moves towards the boiling tube.
(d) What is the use of set-up D?
There is no mealworm grasshopper
in set-up D. If there is any change
in the position of its red ink marker, it means there are changes in other
factors, e.g. temperature and air pressure. These factors
will also affect set-up C.
By comparing the results in set-ups C
and D, we can know the actual effect
brought about by the
mealworms in
set-up C. Set-up D is known as the control experiment for set-up C.
Conclusion:
Ø
The mealworm grasshopper takes in oxygen and
releases carbon dioxide in both bright and dark conditions.
Ø
The gaseous exchange of the mealworm grasshopper is similar / the same in both bright
and dark conditions.
