1984-02-18 — Page 28

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)

WW.LEUNG

MILL & DALE PRESS LTD.

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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