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報日僑華
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九時,凄播英國廣
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八時,新聞簡報,
-新聞簡報。
• 1
other substance is produced during this process?
The glucose solution
was firstly boiled
and then cooled before dried yeast cells were added. Give two
1985
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生
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(六)
d)
BIOLOGY (6):
W.W, LEUNG
e) (1)
MILL & DALE PRESS LTD,
Unit
2: Gaseous Exchange:
between organi am S and environment
4. The diagram below
shows the human respiratory system. (The parts are not drawn to scale.
~Trachea
Name: the cavity X. State three functions of it.
b) State the importance
of the cartlaginous rings of the trachea. c) (1) Name the fluid
filled in cavity Y.
(ii)How does this
fluid assist breathing. movements?
a) Describe and explain
how the ribs and diaphraga can increase the volume of cavity
Y.
What is the importance.
of this increase in volume of cavity T to respiration?
Explain why the breathing rate of man increases when be breathes repeatedly the air in a plastic bag placed over his
nose.
5. The diagram below
shows an apparatus to measure the rate of anaerobic respiration of yeast.
Yourt & 1% glucose water bath
The results in the following table show. the volume (cm3) of
gas collected at 10-minute intervals.
Gas volume.
Time (minutes)
(cm3).
0
0
10%
6
20
12
30
17
40
20
50
60
22
23
a) How would you test for
the gas X in the syringe?
b) Apart from gas X, what
possible reasons.
What are the functions. of (i) the water bath and (ii) A?
Plot the results on the graph paper.
(ii) From the graph
you have drawn, determine the rate of
respiration during the first 20 minutes.
(iii)Give a reason for
the change in rate of respira- tion after the
first 20 minu
6. The diagram below
shows two sealed aquarium.
Aquari
Wafer plan
EV
Aquarium Y
Light
Light.
Which aquarium is ecologically more balanced?
b) State, with reasons,
the aquarium in which the snails vill live for a longer time. State, with reasona, the aquarium in which the plants will have a healthy growth.
d) What is the source
energy for the activities :of organisms in the sealed aquarium? Why is the amount
energy obtained by the snails from vater plants greater than that accumulated in their bodies? 1) (1)
Name the type of organisms which is important to the ecological balance but is not shown in the diagram. (11) State two
examples of this type of organisms. (iii)What is the
importance of this type of organisms to the ecosystem?
X is the nasal cavity.
The functions of it
are
to warm the air (ii) to filter
the
air and (iii)to moisten the
air.
They prevent the trachea from
collapsing when the
air pressure is
reduced during inhalation.
c) (i) Pleural fluid,
(ii)It lubricates the
surfaces between the pleural membranes so that
they can slide over each others with very little friction. A,
The contraction of the intercostal muscles pulls the ribs upward and outward while the contraction of diaphragm muscles flattens the diaphragm. The se cause the volume of
increase. cavity Y to
The increase in volume
of cavity Y reduces the internal pressure go that air can be forced into the lung by the greater. atmospheric pressure to supply oxygen for. respiration.
When a man breathes repeatedly the air in the plastic bag, the concentration of
carbon dioxide in his lung, increases. This
leads to an increase in the carbon dioxide concentration of his
blood. The increased carbon dioxide
concentration in blood stimulates the medulla of the brain to send out more impulses to the diaphragm and intercostal musclés so that the breathing rate is increased.
a) (1) Carbon dioxide,
(ii)Sea is the reservior.
A: photosynthesis B: respiration C: feeding
c) (i) Process E
شره
(ii)By greenhouse
effect, an increase in atmospheric carbon dioxide tends to result in an increase in atmospherię temperature. This may lead to melting of the polar ice caps and flooding of coastal cities.
(1)
Solar energy.
(ii) Process A. (iii)Chemical energy
in food molecules, Some of the carbon incorporated is accumulated as the body substances during the growth of the
young cow.
Aquarium Y.
Aquarium Y.
(1) There are more
water plants in aquarium Y and therefore more food for the snails.
(ii)There is a higher
activity
photosynthesis in aquarium Y and therefore more carbon dioxide removed and more oxygen supplied.
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今樂府
香港第一台 十五分,八與第二位報,天氣獸告及華的命
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for
the snails.
c) Aquarium Y.
(1) There is a smaller
number of snails
in aquarium Y and therefore the tissue of water plants eaten by snails is so small that a healthy growth can be maintained.. (ii)Though the number
of snaila is small in aquarium Y, the water plants still obtain sufficient carbon dioxide and minerals from the snails.
Light.
Some of the energy is lost in forms of heat and mechanical work. (1) The decomposers. (ii) Bacteria and
fungi.
(iii)They decompose
the organic excretory
products and dead remains of other organisms into simple organic materials for the use of producers.
物理
(六)
明德出版社盧雄國 提供資料
PHYSICS (6)
H.K. LO
MILL & DALE PRESS LTD.
Answers to Exercise 3
(a) Take the direction
to the right as positive. Initial momentum of the target =(100) (-3)
--300 kgms
initial momentum of a bullet
=(0.01) (600)
6. kgms
Assume n bullets are required to stop the motion of the tanget, the momentumİT
of n bullet
1
Since the target.
stops finally,
8
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Weight of the copper hemisphere
({πr2) (P) ( E )
Since the centre of mass of the combined body is 0, there-. fore,
• of the wei
eights of the cone and the hemisphere about ◊ are equal in magnitude,
(Ar2n) (P) (e) (Zn) (13) (0) (8) (금)
h2=3r2.
b=3/3r
•G
(Ans.)
As shown in the fig., the centre of mass of the combined body is
G is x cm from նշ.
Hence, moments of the weights of the cone
and the hemisphere
about G. are equal in
magnitude.
(xr2b)(P)(x)
3
(b+-x) -(Tr3)()(g)(x)
h(+h+2r-x)=2rx
(+r+r-x)=2x
xr (Ans.)
24
(ii)The system is in
stable equilibrium because the e.g. is. below 0.
8k4
MB ka
As shown in the fig. and T are the
therefore, the final momentum of the
T
1
system is zero,
6n-300-0
n-50 (Ans.) (b) The energy lost
during the impact
(100)(3)(0.01)
(600) (50)
=90450 J (Ans.)
-450+90000
Let Odensity of
copper Weight of the copper
cone
tensions in the string. Let a be the acceleration of the 18 kg block, then the 8 kg block is 28. T-8(2a)
T16a.
T2-2T1
(2)
18g-2T-18a..(3) Substitute (2) into (3) 18g-2T-
-18a
9g-Tŋ=9a . . . ( 4 )
Substitute (1) into ((4)
9a-16a-9a
25a=-9g
a-(10)
9
-3.6 ms
(Ang.)
acceleration of the 18 kg block is. 3.6 ms
2
and that of
the 8 kg block is
-2
7.2 m's
(b) T, =16(3.6)
57.6 N (Ans.)
(e) T2-2T1
115.2 N
(Ans.)
4. Let N-the reaction
from the smooth wall of the
cylinder
W-weight of the
ball
R-reaction between
the ball
B
(a) The direction of the
réaction from the smooth wall of the cylinder on the upper ball is normal to the wall and towards the centre of the ball.
(b) As shown in the
diagram, BA=2x(radius of the
ball)
=0.2 m
BP (diameter of the
cylinder)-21 (radius of the
ball) m2x0.15-2x0.1
-0.1.m
2:2
PBA
-10√3
AP
gine AB
Since the balls are
in equilibrium,
Ruine÷W
R()-V
=(1,5)(10) R-17.321 N
(Ana.)
Water
Let dadensity of watèr =relative density
of the wooden block Upthrust on the block due to oil
=(0.5)(d)(g)(8A)
where A is the cross- sectional area of cube.
Upthrust on the block. due to water =(d)(g)(24)
Weight of the wooden
block
=(P)(d)(g)(104)
(0)(a)(g)(104) -
(0.5)(d)(g)(8A)+
(d)(g)(2A)
10-442
*0.6
(Ans.)