1984-11-30 — Page 15

日八初月十閏年子甲歷

頁二第張四第

1985

中學會考試題預習專欄

生物

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明德出版社

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BIOLOGY (11)

W.W. LEUNG

MILL & DALE PRESS LTD.

Unit 4: Transport and

Organi am

The diagram below shows the vertical section of the heart,

Right ventricle

Pulmonary whery

Pulmonary

vein

Left ventricle

a)(i) Name the structure

A.

(ii)What is its

function?)

b) (1) Name the structure

B.

(ii)What is its

function?

c) What do you think

̇might account for the

difference in vall thickness between left and right ventricles? d) State and explain two.

way in which the... walla of sorta differ

from that of pulmonary vein.

e) What are the double

blood-circulation in

mammals?

What are

the

advantages of having a four-chambored heart?

g) The two ventricles

contract and relaxat the same time. What comparison can you

dra between the blood outputs of each ventricle?

h) what sort of blood passes through the

heart's left side?

i) Why does exercise

change the heart rate?

j) State two situations Dat vhich the heart rate is decreased.

5. The diagram helow

shova a plant with developing fruit.

leaves -Mature leaves

Developing fruit".

State the tissue, which is responsible for the translocation of food substances....

b) In what forms are the

(1) carbohydrate and. (ii)nitrogenous food:

translocated? Why? c) To which parts of的曲

plant are the food substances produced from the mature leaves translocated? Why?. d)'Suggest, with reasons,

two methods by which a larger fruit can be obtained.

e) Suggest a method by

which a taller plant can. be obtained.

Answers =

a) (i) A: Tricuspid valve

(ii)A prevents the

WAH KIU YAT PO

blackflow of blood from right

ventricle to right: auricle when right ventricle

contrac震趨。

(i)R: Chordae tendineae

(heart strings)

(ii)H prevents the cuspid

valves from:

overtkining when the ventricles contracts. c) The wall of left

ventricle in thicker than that of right ventricle because the left ventricle hás to force blood to distant parts of the body. while the right ventricle only pumps the blood to the langs nearby.

d). The wall of aerts is.

thicker and more

elastic than that of pulmonary vein because aorta lan to withstand a higher blood

pressure produced by the left ventricle.

e) The double blood-

circulations in mammals, are

i, Palmonary

circulation and ii.Body circulation,

1) A four-chambered haart

has the following

advantagesi

It permite a

complete separation of the oxygenated blood from: the deoxygenated blood, so there in a ricer supply of oxygen to the tissues.

ii.It pumps the blood

twice through the heart 想知 a high blood pressure is developed to permit apid transport of substances

throughout the body.

The blood outputs of.

each ventricle are the

報日僑華

b) Oxygenated blood.

i) Increased muncle

activity means a rise in the muscles' oxygen and food requirements, with extra carbon dioxide and wäste materials to be carried away. The heart responds by

increasing the heart rate to pump more blood to the muscles to meet the requirments.

j) The heart rate ia

decreased by (i) sleep sod (ii)advancing ag

Phloem.

(1) Sugars.

(ii)imino acids. They are soluble in water and can diffuse through the plaswa membrane of the plant dells.

c) To the apex, young

leaves and the. developing fruit. The apex and the developing fruit are active growing regions · which require food substances for growth, The young leaves cannot produce. sufficient food for their growth and therefore need

additional food supply from the nearby mature. leaves.

To remove the apex and young leaves no ad more food from the mature leaves can be translocated to the developing fruit.

To remove a ring of. bark below the developing fruit, so that food cannot Pass to the lover parts of the plant

and therefore

Eccumulaten" in the

developing, fruit.

五期星

日十三月一十年四八九一歷公年三十七國民華中 育教聽視

To renova the young

理(十一)

leaves and the

developing fruit.

物

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PHYSICS (11)

HK. LO

MILL & DALE PRESS LTD.

1.0.5 kg of ice at 0°c is thrown into a vessel containing 0.5 kg of ate 100°c. The specific heat capacity of water, la 4200 Jkg-10-1

the specific latent of fusion of ies is

1-1

336,000 Jkg” and the specific latent of vaporization of stam i. 2268000 Jkg” Calculate

(i) The final temperature

of the system.

(ii)the mass of ice at

0°C required to obtals a final temperature of 20°c.

Figure 1 shows a simple constant presare air the 76– meter. It consists of a. uniform thing glais tube containing dry air with a mercury index, and fixed to half-ster rule.

Figure 1

The length of the

colon of trapped air

is measured at

different temperatures

Temperatore. | Length L

ice point

stem point

ankawa

temperature

280 mm 385

345 mm

(i) What is the value of

absolute zerot of

temperature as indicated by these experimental result? (ii)What is the unknown

temperature?

3. Figure 2 shove a graph

of the reciprocal of

0.035

0-02

0.01

object diatanen (吉)

plotted against the reciprocal of image distance (2) for a converging lens.

0.42 0.03 0.04

Figure 2 (a) From the graph,

calculate the focal length of the lera,

(b) The lens is now used

as a magnifying glass

for reading. It is found that the area

of the image of a square printed on a book is 9 times that:

of the aquare. Find

the distance between

the lene and the Book.

4. A tuning fork of frequency 255 Hz vibrated in unison with a atretched metal wire:vibrating with its fundamental frequency, If some WIL the is now attacked to prongs of the tuning' fork so as to lower ita frequency, 5 beats per Becond can be heard, By what fraction must be the length of the wine he altered in order that it may again emit a note in unison with the tuning fork? Is the alteration in the length of the wire ab increase or decrease 40 7.

5. A. wire of length 1

supporta a weight W emitte a note of frequency f Hz. (ses figure 3)

Figure 3

If the weight Wis immersed; in water, the length of the wire should be adjusted to 0.9效的右也不s such t好好去 the frequency of the noted emitted remains unchanged. (neo figure 4).

Figure 4

Calculate the relative. density of the weight.

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