1976-05-04 — Page 28

貧四第張七第日六初月四年辰丙肠夏

DE

1976中學會考試題預習專欄

生物科(廿四 ) · 卓唐慕備,

#24

BIOLOGY

Revision Test 4: MC on experiments:

Bronthymol blue is an indicator

which turns yellow in the pres- ence of CO2 and blue when the CO2 is removed. The apparatus was set up as shown in the fol- lowing diagram. CO2 was blown into both test tubes. Both tubes were placed in a sunny window for several hours,

Which of the following statement

is FALSE?

The CO2 blown into test tube II would not be consumed:in the abu sence of sunlights:

Starch would be formed in test tube II.

The water in both tubes would change colour":

d. The water in test tube II would

turn blue.

Test tube I is a control in this

experiment.

Breathgmai

blue

Cork

a sprig of Eliden -Bremthymet

blux

The following apparatus is used to show the balance of nature. The one that best illustrates it

15:

Sing et Electe

I and II because a living organ-

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ism lives in a scaled container.

II and III because photosynthesis goes on in a sealed container.

III, beckuse the anail and the green plant can both live in the sealed container.

d. II, because the fact that the

green plants may exist independ- ently is demonstrated..

I, because the snail has no com-

pe

lon for food.

the following diagrim, the gas collected in the top of the: test

tube is mainly:

carbon dioxide produced by the plant in photosynthesis. oxygen produced by the plant.in: respiration.

carbon dioxide produced by th plant in respiration.

d. oxygen, produced by the plant in

photosynthesis.

dissolved air from the water.

Gels

-Gas bubbles:

If CO2 was present in I of the above diagram it would

a. kill the plant.

cause the formation of an acid. remains unchanged.

-

go out of the solution by the

warmth of the sun.

"be used by the plant to make food.

5. A control for the above experiment

would be one in which:

a. another green plant is used in-

stead.

b. carbon dioxide is added to the

water.

c. sunlight and the plant are

moved.

d. the plant is removed.

bromthymol blue is added to the water.

Ansuris Explaned.

1. C. In the presence of sunlight,

the sprig of plant will carry

日四月五年六七九一座公年五十六國民中育教僑華

二期星

on photosynthesis by absorbing the CO, thus causing the bron- thymol to turn blue.

The

yellow colour will remain in test tube. because without a green plant, photosynthesis will not occur. Test tube T is a control since all conditions except the pres- ence of a plant are duplicated. Starch is the product of photo− syithesis.

C

The balance of nature is il-

lustrated in test tube III. It shows how the green plant is the basic source of food. The snail feeds upon the green plant. Its wastes supply the minerals requir -ed by the plant. The CO2 formed in respiration by the used in photosynthesis plant. The excess 0, formed by photosynthesis is used by the siail in respiration.

is

the.

In the presence of sunlignt photosynthesis is carried on by the plant under the funnel. 02. is given off during this

process.

D A control in this experiment would be a repeat of the same omitting the plant in order to show that it is the plant which is. -responsible for the accumulat Lion of o in the test

經濟及公共事務科

(十二

劉文光

This shows that newspapers are indispensable to a society and any restriction which may impede the free- dom of press should be repealed. By the freedom of press we mean that a newspaper should be free from govern- ment censorship and control and that newspapers should be allowed to publish news factually and impartially without any interference.

On the other hand, a newspaper: should not publish any anti-government Bentiment or defame the good names of any citizens or anything which may pro- duce bad effects to the society, such as dirty.atories and pictures. In order to protect the interest of the citizens, newspapers. ahould be censored. And for this reason, the Objectionable Publicat- ions Ordinance was passed in 1975 to impose a maximum fine of $100,000:and

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We should say that the freedom of the press should be preserved at all. cost in HK. Only: if a newspaper breaks the law of sedition and libel, shall it be censored.

What are the functions of the news-

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The newspaper is the daily bread. of many people in Tiong Kong. There are over 107 papers. registered in Hong Kong and the total circulation is over one million copies a day. A newBpaper serves the community in the following ways:

A newepaper provides the public with information.

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A newspaper guides the readers

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A newspaper reflect public opinions.

The newspaper is a bridge bet tween the government and the people. It reflects public opinions and instructs the gow-. ernment to act in the best in-

terest of the public.

5) A newapaper acts a.watch-dog of

the government.

Flaws in the government

achin-

ery are revealed through the newspapers. Thus newspipera help to keep the government on its toes.

A newspaper also serves the community in other wayɛ..

Retailers and wholesalers ad- vertise their "goods on the news- paper and consumers know where to buy and the way. how to spend their money to achieve the maxim mum satisfaction out of their. spending. Une can also.com- municate with another person through the newspapers.

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