1970-03-08 — Page 14

百二穸張四第二日一初月二年戌庚展夏 WAH KIU YAT PO

夏季橋

僑榮

3#5%2#3%8#3%$#@%$#

#$%$#

元气服

中文中學會考試題預習專欄

生物科 (十八)

莫登桐•

-証明植物行呼吸作用吸入氧和排出二氧化碳

A.用具:略

B. 药品:氫氧化鉀溶液焦性沒食手酸结晶汲食子酸鉀溶液,

C. 材料绿豆種子

一棉樂

幼苗

一湿棉花

郭日僑畢

日期星2日八月三年〇七九一矮公年九十五國民華中 育僑萃:

取鐘形罩外套上黑布以避免光合作用吸一氧化碳,罩之底 邊塗上凡士林放置玻璃上以避免忘部遭氣罩内並預先 放置生活旺盛的植物-盆除植物外整盆包以膠布以连 免盆的微生物呼吸影响!

3.取一底部有龍頭之玻璃瓶富作抽氣瓶內登滿水定為E瓶 4. 以玻璃管和膠塞把上列各瓶裝置如上圖並把E瓶龍

頭開放控制水慢慢滴出,

E结果空氯入瓶,經BCD而收集在E瓶 經一段時間B

.澄清,D瓶則相當混濁

F.結論空氧由玻場管入月瓶空氣内的二氧化破殻焼肉的

丸化鉀吸收空氣再至B瓶無混,現象,此註明空氣

已無二氧化碳當無二氧化碳之空氣經鏝形罩西至D瓶則 D瓶內石灰水混濁,此証明空氣復有大量二氧化碳存在因 二氧化碳遇石灰水會結合成碳酸鈣沉澱,由此可证明 二氧化碳來自罩內的植物,因植物在此裝置下,缺乏光合 作用的條件(缺光)祗在進行呼吸作用,所以說,植物呼 吸時呼出的是二氧化碳

三.証明呼吸時有熱產生(以種子去証明)

4.用具略

沒食子酸

A管

钾溶液

B. 材料略!

一张水熬(A2

一熱水数(5)

-實驗撲水

氢氧化钾

170英文中學會考試題預習專欄

文書院:主編

經濟及公共事務科 ( 十八 )

Economic & Publie Affairs

Lecture No. 18

Answere to bzerolse No. 17

Question Ds How aves a post office serve

community?

Answeri

"It is amazing that for as little as five cents one can communicate with one's friend within the territory of Hong Kong and that for slightly more than the price of a Coke, we can communicate with any ona in any part of the world. This would not have. been possible if not for the existence of the post office.

Sending and delivering our letters are not the only work the post office does, although this work occupies a greater part of the time and manpower of the Post Office Department. An interesting fact arising from this week is that we never question the honesty and dependability of the postmen, perhaps because the postal authorities are particularly careful in their selection of those who are assigned to postal delivery; another reason being that the punishment for opening and wilfully damaging or atealing other people's letters is very serious. However, to ensure that one's latter does arrive at its destination one can register a letter by paying an additional twenty cents. But registering a letter is not a prevention against its less; it only emans that it is possible to trace the journey of the letter. Of course, should a registered letter be lost through the fault of the post office, the sender can claim for a compensation which should not sxceed $40 from the post office.

D.方法

阪口椏26mを玻瑠管西支把萌發中種子10粒登槫 花片以線邊拎一端並塞上膠塞另一端則各倒拖於二天 银曹襄管之上方盖上黑布避免幼苗進行光合作用裝置如

定其一管為A管迅速用弯曲的吸管注上少許沒食子酸鉀 溶液菸管內

3.定男一管為日管迅速用賀田的吸管法少許風氧化鉄塔

爽於管的

E结果

FA管很快便有水銀升入約佔空間一高度

2. B管經過一段時間之後水銀已慢慢升入管内直升至约 佔空間言高度就停止不升,若以鑷子夾取焦性沒食子醅 的结晶 数粒能管加入此结晶很快便浮升至水銀面隨 *即與氫氧化鉀溶液化合變為沒食子酸鉀溶液,但經淥 之都不見水銀上升,

下结論

A管內約有古的氧氧為沒食子酸鉀溶液很快的吸收了 因此管內空間壓力減低外間大氣壓促使水銀於管內上升 這現象可証明管中原含有约一体積氧氧

B管加上氫氧化鉀溶液後水銀慢慢升高約佔空間方是 由於幼苗呼吸時漸漸吸去筒内約方氧氣呼出二氧化 碳二氧化碳續被氫氧化鉀溶液吸去故餐內壓力減低

卦間大氣壓促慢水銀上升這現象證明種子呼出二氧化碳 B管之氫氧化鉀溶液經要為沒食子酸鉀溶液後,水银

視上升 ̇此現象証明管内原有一之氧已消失,從化學知 综合上列三點可知 鐵上知道除幼苗外氧無去處。 植物進行呼吸作用時吸入氧和排出二氧化碳 二、証明植物行呼吸作用時呼出的是二氧化碳

A用具:略

氨歉。

C材料,绿色植物一盆

黑板

玻璃板

温度

溫度

濃度不變

方法:取出熱水瓶,其一定為A瓶内置50粒已浸水五小時 之绿豆種子(浸水可促進其發芽與呼吸)其一定為日期 内置50粒已煮熟放冷之绿豆種子(無生命不能行呼吸 (作用),二瓶以棉花塞口並插上溫度計 然後把瓶口倒

置,使種子近溫度計之水銀球 其裝置如圖

*D 结果:起初二瓶溫度無大差别,绝经数小時疫見A瓶溫度 渐升B瓶溫度無变化,經24小時後,則見A瓶温度上升 與原來溫度有顯著差到,而B瓶温度無大变化

E结論,自習 不解答.

「四註明種子呼吸時氣体之改变

A.用臭略

B. 材料略

上方法同上题

D.结果: AB瓶經4小時後,A瓶打開瓶口迅速 以燃燒匙附小段燃燒中的洋燭插入瓶內 洋燭立時熄滅,以B瓶同法處理則否,洋燭 還可燃燒片刻.

E結論自習不解答

五光合作用契呼吸作用之比較

光合作用

呼吸作用

「進行時間限在有光能時,一般在日間畫在不停地進行

原 料 水 二氧化碳。 「葡萄糖及其他養料及氧

能或釋 能把光能貯於糖之分 放能!

產物 葡萄糖氧水 進行部位 含葉綠粒之细胞內 陽同心或異化 同化

反感が株式

石灰

6CO + 12H2O+光能 葉綠粒

~C2His Oi +6 Q2+6H2O

取三角瓶三個一瓶盛以氢氧化鉀溶液定為A瓶,其他 -瓶盛以石灰水分別定為BDa

一.解釋名詞:

A. 分手間呼吸

B. 光合作用

C.碳素同化作用

D氮素

釋放能把糖及其他養分 的三位能投出西為動能 二氧化碳水或含氮化合物 任何生活中之细胞 異化

CCH2O+60

~ 6CO2+6H20+能

·試以實驗表出種子可進行缺氧呼吸必須钁制和叙述

Although wired and wireless communications through the work of the Cable and Wireless Co., Ltd. and the Hong Kong Telephone Company Limited, are possible, many businessmen still resort to the great tradition of communication through the post, partly because, one can say more in onete Jetter than in. telegram:ow a telephone conversation, and partly because it is the cheapest form of communication.

If one wished to send parcels, it is alec possitis but the post office is very strict about certain things which are not allowed to be sent by post, because they usually constitute an element of danger. Thinge like explosives, weapons, inflammable: material, alcohol and poisons are not allowed to sent through the post office.

If one wishes to keep one's residential or. business address confidential, one can always rent a post office box (P.0. Bor), which will become the collecting point of one's mail. A P.O. Box can alau eliminate any possible mistakes in the delivery of the letters caused by caraleas or illegible addressing, and any possible delay in their delivery. Afee of $40 per year ié charged for a P.O. Box if. rented at the General Post Office, the Tsimshatsui Post Office or the Kowloon Central Post Office, and $36 if rented elsewhere.

For business enterprises, the post offic8 provides large sacks with number taga to collect their letters. These sacks can be rented, Businessmen have also known that it is possible to print reply carde in magazines and newspapers and these can be returned by the customers without using stamps which are actually later paid by the businessmen. These reply cards are convenient in that they save considerable time that may be spent in buying stamps and besides, such a method is one way of arousing. public interest in and response to a new product.

Another service of a post office which is "better known to tourists than to local residents, is the Poste Restante, Touriste going to a new country can ask their friends to address their letters to the General Post Office of that city, and the General Pont Office will hold the lettera until receivers go to claim them. This service is free of charge. is obvious that the post office has temporarily acted. as the address of the receivers.

In one small respect, the post office can act as our banker,: and this is by the remittance service it

offers to the community. Should we find ourselves wanting to send money to friends or businessmen sbroad, we go to the post office and buy what are known as postal orders or money orders which are

somewhat similar to our bank drafts, or banker's orders. For any amount up to $100 the post office chargea $1.00 and for every: additional $100 the charge is increased by 50 cents. This applies, to money orders. The maximum amount that is allowed to be sent within Hong Kong is $400, and the maximum. amount allowed to be sent abroad is $640. The charge 1日。姓常版道a case, 62 for the firat $100 and: for: every additional $100 the charge is increased by $1

Question (2) what are the chief characteristics OF

dan's wants, and how are they met?

Answer ...

Man's wants tend to compete with one another. This is explained by the fact that: as things are limited in supply, scarcity as economists call, we often find ourselves deciding whether to do this or to do that. Time and money in particular are greatly demanded by people, and when our decisione invoice: these two things. we find that a choice must always

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