1974-05-25 — Page 19

REFERENCE LIBRARY

六批星

日五廿月五年四七九一公年三十六國民華中

(b) In order to keep the two men

in good health, they should takė in vitamins/ mineral salts and water.

(e) No changes will occur in this

wheat coleoptila respect to the growth and curvature.

(f) The wheat coleoptile will in

oressa in length and grow straight; ugmards.

育教倪造頁三第張五第

BOVA OM41PETWAH KIU YAT PO

報日僑

CITY HALL

fis aanrject- ¿iva function.

(iii) For g(x) = 3(9-X)

12. A right circuler cone is divided into 3 portions A, B, and C by planos parallel to the base as shown in Fizi3. - The height of each portion is ↑ unit. Calculate

BIOLOGY SYLLABUS D PAPER

of

A

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10. A boy wishes to ride up a slope

of inclination e, where in S. but can do so only by zigzaging up a track, whose inclination in.

Find the

hero sin = angle between the track and a line of the greatest slope. Solutions Let h be the length of

BO

Sin

10h

Sin

FAC

(1) the ratio of the volume

to the volume of B.E (11) the volume of D to that of C

and

(iii) the ratin of the area of the

curved surface of B to that of C.:

Solution:(1)Volume of

lume of A+volume of♬

volume of

volume of s..

The ratio of the volume of A to tho. volumo of B is 1:7

volusie of

(ii)

volume of A + volume volume of B

of

*

volume

or volume ofB

of d

volume of A volume

B

of volume. of D volume

Volume

volume

The ratio of yol-

ume of 8 to volume

of C 1977: 19

(iii) Arsa of curved surtace oi

Sum of Arel of curved guriice

of A and B.

3

PAR

36 52'

The angle between

the track and a

line of the greste

eat alope da 36 52

curved

cived surface of

Sum of area of curved

Bur

sur

and D

of area of curved surface

aren of ourved surface

34. The method of mutrition öf.

Spirogyra 13 of autrophytic type. The method of nutrition of qucar is of saprophytic type. Spirogyra makes its own food by photosynthesis.

Bunor gets its food by digestion of decay matter.

The posted. was places in

a dark 100a

to declaim for 2 days

light-proof..

broker

The potted.

plant was

clored under sunlight with:

That being -Crucent by opet on cides.

-the leaf which he been capered by light-pirof paper and plan

sunlight.

alcohot

boter is watbed

leef.

by late-

(e) The rice intake is digested

to glucose, the excess soun of glucose vll be stored as elycogen in the liver.c. The oil intake ia digested t fatty acid and glycerol, the excess amount will be stored under the skin, around inter nal organs and in the bone' marrowa.

-

The Lean went intake to di- gested to emino-acids. The excess amount will be broken down by deamination. The amino-group will be ex- creted and the remaining mo- lecules are stored as glyco~! gen in the liver,

A. (a) (1) R is synapse connecting

the association and motor „neurones.

(ii) It osrries a nerve impuls trou a sensory neurone to a motor neurone.

(b)(1) 3 contains corabral

spinal fluid. -

(ii). The carabral -- spinal

fluid is used to nourien the cells of the brain by "bringing food..

It also carriea away tha wagtes of the cells of the mezones.

(c) (1) The layer T ie the gre

matter.

(ii) It is composed of the cel

Hadise, of the neurones.

(iii) Ita urface is greatly -foldad to increase its

surface area in contact with the berebral-spinal fluid so as to chtain nurlabment.

(d) The cerebellum of the mantel-

1an brain is concerned with Bo-ordination of voluntary muscles to maintaizi muscle", tone, & to ensure that muscles involved in an action can work in harmony.

(1) The arrows show the

direction of transmission of impulse along the neur- ones, They show the path of a reflex action and the transmission of nervebakk impulse from the associat- ion neurons to the brain.

A tadkole, with east

* external gilis

a: auditory organ A mouth

os cement gland

ant opening of clonos

Type of food the tadpole cata aré vegetable matter (herbivorous)

A-tedpgli" with internal, sipc. Kovi" (same as for pårt opt operaukum

Type of food the tadpole eats are gradually becoming that of animal batter, though it still may feed on Fregosation. (herbivorous gradually become, carnivorous).

aro:~

B. The importance of the larval

stage in ingeote and saphibians (1) a period of ferocious feeding

during which it obtaing, food * required for subsequent growth A development

(11) a period of rapid growth as it

neede to undergo changés to meet the environment,

(111) ́a period of internal develop

ment, as aëre odmplex organs are developed to meet the de mand to exist.

Bea larva do not have to look for -food, they are fed by worker bééя whereas a tadpole has to seek ite own food.

Secondly, tadpoles obtain food by filtering them from the water with their gills wherean bee- larva sucks up the semi-liquid food fed to it by the worker beë,

數學科題解 文長波

Mathematica

folution to Hong Kon; School Certificate

Section (Close any FIVE questions..

Each question carries

marts 1

A function fAA is defined by

OSXS4

(-6)2 4<<9)

Dravi the graph of f in the figure below, part of the graph is already drawn.

(ii) Is f an injective function

from A to A ?

Io 18 surjective function from A to à ?

(iii). If g(x) = 2(9-X) find,

graphically or otherwige the Bet {XEA : f(x) = g(^)};

Solutions (1) For f(x) = (x-6)2;

4€X69

London

when X=5 or X=7,

£ 18 dot an, one

to one function

(or injective function). For the f(x) =

f(x) = A

A man borrowɑ: 1000 from a barik on the first day of a month. Interest is, calculated at the en "OL-overy Month on the mount

still owed at the rate of 1% per month.

(1)(a) If he pays back at the

end of the first month,. find an expression for the amount still owed. (b) If he pays back another

SX at the end of the second month and still another at the end of the third month, find an expression for the amount still owed.

(ii) If, at the end of the third;

month, he has jaid off the debt completely, find the value of X (correct to figures,)

lution: (i)(a) After the end of

the first month. the amourit atili oved

[1000 (1+13) -X7. -5(1010)

(b) After the end of

the third month, the amount otil

med

1030-3.03X)

He has paid off.

the debt com

pletely at the

end of the the

ird nonth.

1030-3203X = 0·

-X340-

The value of K. 1B 340,

of curved surface of area of curved surface of

The ratio of area of curved surface of, B. to that of C ie 35

Correction for mathematics 27

4. In fig.1. OAB is a sector of a

oirals.

400-30m(01) = 2 end m(00).

(CB).

Find the area of the ahaded part (Leave Tin your enter).

Solution: Area of sector DAB

j

Bq.

sq. unita

m(00) = n(CB)

Aran of AAOC

• {(2)(1) Sin 30

ay unit

$q. unit.

Area of shaded part

=(-2) sq. unite

34 units'

生物科(乙)卷一題解

̇卓唐慕儀

black

Color

solution

ie added.

Loof

celeur

come ned starch bided no pireence.

C.(a) The daily calorie intake of K

360 x 100+

'x 100

100

12 x 100+ 6 * 100 2400 calori

The daily calorie intake of L

* 100 + 70

x 300 +

x 100'

21 x 100 + 7 x 100

100

3800 caloria

Lie the labourer as he needs more energy for his work, thus he takes in more food daily.

(11) P is the sensory or i

afferent nerve,

Qla the motor or efferent norve

The sensory nerve functi ions in carrying impulses from receptors to thee, spinal cord The notör! nerve functions in convay- ing response from the. spinal cord or brain to the effectora.

(f) The spinal cord, in this act

· ion, uets as the centre of the reflex ar ̃O » It contains the association neurone to pass the impulse from the sensory neurane to the motor neurone to effect res zonge

In this reflex action, the bain receives the atimulus and becomes aware of tlie act-. ion after raflex has taken place, so that," it can give further voluntary reaponas, to the situation.

B. (a) The tip of the wheat coleoptTM

120 wi30: bend towards the source of light and “increase, in length.

(b) oohanges will acour in this wheat colepptile with respect to growth and curvature.

(c) The part of wheat coleoptile

which is under the out will increase in length and bend towards the source of light.

(4) The part of wheat coleoptile

which is under the gelatine blook will increase in length and bend towards to the Bourge Cor light..

-D.(B) Long toothed mandibles used in

moulding war when building honavcomb.

(b) 18t" maxliise ara long and··

slendar, jointed rods, Hollow on their surface. They can be brought together to form a sheath for the lower part of the tongue.

∙∙B, (e)

Labial palps are hollow to: form euoking tuba,

mudden increase in the tad- pole population will cause the decrease of pond weeds and green. alge.

An" decrease of pond weeds and grem alge will decrease the amount of food supply to fish and protosoa and also a dam orease in the amount of 02. supply and an increase in CO2

(a) The decay dead body or a frog.

-will be- decomposed by patrefy-- ing basteria to simple organis substances from complex oreznie aubatanong.

Thane simple organio substance will become the humue in the soil thus add mineral supply which will fertilize the soil.

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待者

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IN THIS.

BUSINESS

THERE

ARE

NOW

Innocent Bystanders

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