在一期 日七廿月五年六六九一股公年五十五國民部中
美国第三第
日八初月四年牛芮X
WAH KIUYAT PO
華僑教育
英中會考生物科答案(5)
徐錫禧
英中會考物理科答案(成) ●陸永熾
((b).
QKDEFB, C, BY
PHYSICS
Bruch
commutatar
Construction of a simple D.C. motor?
consists of a rectangular coal of wire mounted
a spindle so that it can rotate freely in a magnetia
The two ends of the coil are soldered respectively ield.
o the two halves of a copper split ring or commutator, Two carbon brushers are pressed lightly against the commutator by means of springs and when these are connected in circuit with a battery and rheostat coil rotates.
"The rotation is caused by passing current in a Conductor setting up a regretic field wrapping the couduntor. The tendency of the Knos of force tend to shorter and repel one another. Two forces from. a couple which rotates the coll. When the coil is
in a vertical position, the conductor is tangential
to the field, no force arts on it. The coll
however, moves over the gap dus to inertia and co12] Įrotates coztínuvasiy
B
tha
Conva:
Part 11
H.K.B:3.C.. 1966:
Biology
í Proposed Answers
by R.Sh: Taif
6. (e) dive the main aim of doing a water culture experiment:
The main aim of doing a water culture experiment is to. show the various elements are essential for a plant which is able to grow with its roots in water even though it is normally rooted in 2012.
(b) State any Two precautions to be taken in setting up such an
experiment.
(1) To paint the external surfaces of the bottle black so as to
prevent the light from the solutions. This prevents the growth of unicellular algae in the solution, These are apt to clog the roots and to interfere with normal absorption.
(11) Air must be blown through the sclutions daily by means of the
right-angled tube to provide oxygen for the roots.
3
Ib.b. or the candidates can mention;
1.
Ine under sides of the burgs and the asbestowool must be kept dry to prevent the rotting of the stems.
2. The solutions should be renewed at the end of each solution,)
State the result you would expect dr. the plants from the. following bottles used in a water culture experiment.
=
(1) No nitrates in the culture solutions
Result: Plants have very little growth or soon die because
nitrogen in the form of nitrate is necessary for protein synthesis.
(i) ko magnesius in the culture sciution:
Result
Fiants have poor growth, and their leaves turn yellow because chlorophyll formation falls on account of etsence of cagesium,
14) hame ne source from which the element nitrogen 18 abtained by
(1)
(1)
green flowering planla legumikous pla
(11)
mamma 1.
11 Green plants:
The nitrogen is derived from the humus in the so13, and is absorbed by green plants in the form of nitraLES,
Leguminous plants;
The nitrogen is derived from decayed old root nodules or living or dead' root 'fibres of the plant. resulting from rotation of crops and the "fallow system."
(111) Mammals:
4
The nitrogen 13 derived from sif or from the sain grgyra in the quino acids (or proteins)
(Small intestine (most numerous in ileum) (b) Name Ono. end-product or digestion found in vessel A.
Kastu vrygenous matter diffuses through the villi into #the human. of the large intestine. ✔
((c) Into which organ of the body does slood in vessel A pass]
/
directly?.
plusa in vessel & passes directly carouan 'tne neretio] portal vein into the liver.
d) Idently tns vessel Labelled b/
Fine vessel B 1s lacteal tube or lymphatic vessel through which the glycerin and soaps pass and collect into_the - lymphatia vassels of the whole body.
. This 19 a diagram or 48 12152 potato, plant.} }
3
紅衣
Is) label the parts 2, 4, 5, and 6
2) Petiale'
4) Stem tuber (yong)
5) Scale leaf scar
6) Bud,
) What is the difference between the parts labelled 1 and 3 7
The labelled part is old leaf and labelled part 2 1s young leaf which is developed after the formation of old leaf. Usually in stem tuber lateral branches are formed by main ahoot.
Part 1 is older than Part 2 because more leaflets are
What Is the main food reserve present in (4) ?
Starch is storeG
How would you test for the presence of this food ?..
Dy puuuung in few drops of iodine solution to the freshl cut surface of the dotato the bluish brom appearande is seen. This shown that starch da present in the potato.
Name the food for each of the following insects when it is (a) a Jarya i
(b) an adult.
门
'If the supply of electric current;1s cut off and
(the armature of the göter vere turned mechanically, by
the law of electromagmatic induction the change of flux
HONG KO
1inbage v111.induce e..f. Ühe motor therefore acte as, ja generator
....
Tá the nickel-iron (ädison) escumlator cell, the Įcharged pealtive plate contains nickel hydroxide and the)
negative paste contains iron adde and the electrolyte is caustic potash,
(e) Bickel-iron accumulators are yony zosem ove te Installation in yachts for lighting as such cells have
a very math longer life and require 'ho special maintenarice when out of use for extended periods. It can be left fas monthe-in a discharged condition, without bad.
Butthere
Female
Mosquito
Hosefly.
BLIC LIBA A
In the spaces provided, answer the following questions based on the
¡disgraz.
shat organ of the body are villi formed?
a) Larve
Feeds on leaves and
its ogg shell-
Minute- organisms
Semi-liquid
∴ decomposing wastes
fed by worker ants
b) Adult
On leaves and
vegetables...
Sucks blood from
animal body,
Decayed rubbish, feces fiveottesi meatfang.
various food ..
Decayed organic matter.
10. Write the word or expression that best completes each of_they
following statements>
(18) | A mature call an the human body that is normally found withouʊa
~ nucleus is the erythrocyte (or rad blood cell.) -
(fb): Food is moved along the digestive tube by a ̈process called:
peristalsis.
(e) The ductless glands which are located inside the pancreas
Tare called Islate of langezhang
(d) The enzyme responsible for.
milk is calladiwennin.
exproteins.ory
(a) A charged ebonite rod is brought near to the cap, of the gold-leaf ek ctroscope so that the leaf diverges. The electroscope is then momentarily earthed by torching
the cap with the finger. The gold-lost collapsed. The rod is then removed, leaving the electroscope charged.
marthed The finge
Finger
removed
changat
Loppitivaly
(Reat required to boil 12
800 -0.1)
1250 8
· (80 +1250) (140 – 15))
(1330x480
·
【七初委業格所廿入各
同步員由,派三學
官小一年級招生
由下午三時開始,甲組則由下午四時開始,學員如時按批前往 假大逍中班人行二樓】一六與文式影院雪諾攝影院實習,乙組 峰教授主理,本星期六(二千八)日爲他學員增加切磋機會, ㄚ,該會辦事處以便留座,风染整有普訊,及歡迎發問 【者班敎師及對問開心之家長及師-八六三五四 國際肚、香港教師食主辦之攝影班,橋爾斯界名宿都 戳實家蒞會發表意見,並撕迎各中學行政人員,各校中六及會 「香港敎師會為了解捲大,中大入學試及今後考試制腚之趣,
·接試部之請,來港拼沈本港大學入學試題,其建 食。 「就凛「哈舘】主持。在底家偉現任劍爵大学人数丈委身主席
國考試專家哈第氏
教育界報名聆聽 陈堂舉行「大學人學成之改求問題」演課,認縠近由英抵港之考 【韓,香港教師會定二十八下午二時半,在立併大其該會 此次來港係應港大及中大之邀研究 哈氏四年前曾來港研究中學會考問題 大學入學試問題 明日之演 歡迎
明在教師會演講
報
學校反見減少
設於普羅大衆集居區域之學校 派出表格较多 市中心區之
名人數甚參差
鹽少
入學出錯,已於館(行官升學瓣,使有二三百份申請表而
十
格,大都緻间,正上武校的學生
委員會進行核,
多數基家境清貧的
七月底前獲得醫而鐘 年級滋生,那你至官小,兒意申請入 ,今年印請入各官被的官校,例如柴費區城爲然。市區則因 新步入酒,可於年|士透露,今年宫小一 雲成康租樓宇設立的
|旗大衆遷居日衆之道 大盘津貼學校開辦之
高不一,有部設於谱 老較米,尤以尚未案,
·仙遜小熱及糖冠:
,若千,烈笞的大
人管,一鍵,例日等銜年鏽
百年一的如其者一如設形官接: 飲料
之若級小天九有官較灣區普至一人 們出
數...
新于
| 官立小昂一年,
港大學生會天文學會 貼學校亦超像潑加,,保持在五六百名之 轉費,朗加以審査。 開設已年比年多,律的,才能與去年相若選,而獲得入蠢之中, 以爲是:官立小學之,今年申翻人一年級被遴選委員會辦行造
(怪)
: [特糁大學生會天文學會,爲提
辦天文知識班中中會考
韓)中交中
,可寫個附學校及班級,通知菇大學生會 V,假誰多利工 梁、銀河系等知識、與泛、風、半導商萊高阿料 各中學之頇科畢業同學參加。凡欲參加者郐工弟給園,先途二 武的起阿等等。斯迎各本校其學段就讀於今日考試科目; *內容包括太陽、月漆、行澧、恒、太陽行,昨日考試科, 基本天文知識班。地影響定於際生會所,目考時,昨日碗液雄 倡天文知識,將於七月至九月間,開辦一一壘高中温软考專門科 期間爲七至九月歡迎學界參加 今日試程 [學校行。产]
心天文學會秘盡。
(-))
*Permanent
magnet
T1330 x 4 x 4.2 jovasj
[Zine required to boil it
·lidotrio`power required 132
voice
130 r 4
1955.3
cont
The moving-co11" Loudspeaker works by the Lace
exerted on a surrent-carrying coil, voice call, situated
in a magnetie zield, * Varying electris, currente which correspond with the sound to be reporduced are passed through the voice coil which is free to move in the radial Įmagnetic field. This radial field cute the turns of the .
coil at right angles, and consequently, as the currant through the coil varies, it will move to and fro, The}, paper cone, attachoit to the coil, will not "the surrounding) air in vibration and produce sounds” f
Total resistance regatred " for the circula to measure 20 volte
2000
2000