頁四第張七第 日七十月正年子甲曆夏 WAH KIU YAT PO
1.984
中學會考試題預習專欄
生物 (廿二)
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BIOLOGY (22)
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Unit 9: Organisms and
Environment
1. Lichens consist of two components, the fungus
and the alga..
lichens
fungu
tock
(crose section of lichen) a) what mode of nutrition
is carried out by (1)the fungus? (2) the alga?.. b) Give two structural
differences, which are related to the mode:of nutrition, between the fungus and the alga, (1)Name the type of
association between the fungus and the alga.
(2)Give two benefits:
gained by the fungus from this type of
association." (3)Give four benefits gained by the alga
from this type of
association:
d) Explain why more algal
cells are found near
the upper surface of. the lichens.
2. lie accurence of a
líchen which is very
sensitive to air
pollution is
investigated at
various parts of Hong Kong, Their relative
abundance in their suitable substratum is recorded below.
Relative abundance
( arbitrary unit).
15
Yuen Long
$85.
Lantau Taland:
100
Cheung Sha Wan:
40.
Tsuen: Wan
30.
18.
Vitoria Peak.
87.
Location-
·Kwun Tong
What does
Kwal Chung
the relative abundance of the lichen represent?
b) (1)Which location ias
the greatest air pollution: (2)Suggest two
sources of air pollution that may Tead to the lower. abundance of this lichen in Kwun.
(3)Name one air
pollutant released from these sources respectively and an effect of it.
e) Name a compon
respiratory ailment in many which: can' be cauaed by: polluted air.
In comparing Yuen Long with Lantau Island,
which factor: do you
think in Yuen Long is responsible for
郭日僑華
̇六期星
日八十月二年四八九一曆公年三十七國民華中育教僑華
abundance from rising above 85?
Let the resistance
物
理
(廿二)
kg, a
preventing the
Answers
a) (1)Autotrophic
nutrition,
(2)Saptophytic
nutrition.
b):The alga contains
chloroplasts which
help in:absorbing: Tight for
photosynthesis.
The fungus has hyphae which help in
absorbing water and minerals from the surrounding.
c) (1)Symbiosis.
(2)The fungus gains
food and oxygen from the alga. (3)The alga.geing
minerals protection
adioxide,
from the fungus. The algal cells can trap more light energy for photosynthesis near the upper surface of the lichen.
It represents the relative degree of air] pollution at different locations,
b), (1)Kwun Tong
(2)There are more.
factories and motor cars in Kwun Tong. (3)The acid gas
produced from the factories may cause deterioration of material. The unburnt carbon particles from the motor cars may reduce the sunlight for the photo- synthesis of.the vegetation in Kwun Tong..
Bronchitis
Yuen Long has a higher population than Lantau Island.
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PHYSICS (22)
HK.LO
MTLL & DALE PRESS LTD.
Suggested solutions to Exercise 11
(a)The energy gained by
the: electron. =(charge of the
electron)
(potential
difference).
-(1.6x10-19
(b)Let the maximum
-3.2x10-
1)x(200)
(Ans・)
velocity of the
The.
electron be vis electron will acquire maximum velocity if all the potential energy gained is converted into kineti
energy.
•专qv?-5.2x10-17 4(9.1×10
3.2x10 27.033x1013
v=8.386x1067
(Ans,)
The distance between the plates=10mm.
=10
eleration (8.386x10
2(102)
-3.516x101
15
orce on the electron
3.1x10
(3.516x1017)
(a)(i)
of each bulb.be RD.
when k, and k2
1
are
open, the current
p.d.across Eand.
-(0.5)(R)
when
k is closed,
the effective
resistance
KR
*n+R:
想
R
the current through A
0.5R 0.6À (Ans.)
(ii)when kg and ky are
both closed, the effective resistance
The current through
=0.9A
(b)As shown in the
figure, since the: resistance of Bis equal to that of C. therefore, the current through B is equal to the current through C. The current through. A is the sum of currents through B and C, therefore power dissipated by A
power dissipated by C.
I2R
B and C have the same brightness and. A is the brightest.
450
21
When k is open,
R=12 SL
(Ans.)
(b)If k is closed the
resistance of the branch AB is
decreased, hence, the value of R should be increased.
(c)Effective
of AB
(7)(x)
7+x
7x
7x
21
1242
-56x=21+3x
(Ans.
Let the number of alpha and beta particles emitted he
and y respectively.
238.
He+y
230
·90°
238=230+4X
(Ans.)
92-90+2-y
=90+2(2)-y
(Ans.)
wo alpha particles
particles are
emitted.
(21) R=41 R
dissipated by
and two beta.
I'R
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