其三第張四第
日八初月三周年午丙圈夏
WAH KIU YAT PO
粮
日八廿月四年六六九一暨公年五十五國民中
華僑教育
Most cases are que to:
英中題試題預習專機
The one of the signs of this abnormalilities is that the vertica
生物科
(十七) 徐錫禧
-
This is due to the refractive error which prevents the light rays from coming to a single focus on the retina because of different I devrees of refraction to the various meridious of the eye,
a) irregularities in the shapa of the 'cornes
2) Cataractous change of the lens in old age.
a) Beredity which also plays a role in astizmatism.
fano horizontalbers of a window both cannot be seen clearly at thr
It is corrected by wearing Cylindrical Lenses.
中華畫試題預習專欄
物理科
(十七)
藜淦明。
第五篇 数学
Biology
Exercise 17
[ey 2.3.8. Teut)
2.
Answers to Exercise 16:
What do you know about a Klinostat? And try to describe an experiment to show the effect of gravity on the growth of a young anoot, Explain briefly the processes involved in this change.
中部
金属内中穿孔,當其温度升高時,甚孔芝 面積
Try to make a fully labelled diagram of a vertical section of a vertebrate syd and explain briefly how a change of focus is brougie about.
What are the causes and methods of correction for
Hypermetropia”
a)
b), Myop:a?
c) Presuyoola?
ial and astigmatism?
Lateral vector
mnada
Yellow apet
Blind spot
Langmantive -Carneas
Anteciar chamber
Avertical section of
Libiany body Auspenazy Ligament
Sclica
Charoides
•Beting
Opticnees Meningeal
A change of focus is brought about by the transparent (cornea, queous humour (in anterior chamber) of a vertebrate øye.
These substances
In the ere nave functioned to refract light to form a sharp and clear image of an external object on the retina; the innermoai isyer of the eye.{
However, the thickness of the lens can be altered to fonns ko
Lage,
There is formula to calculate and express how ‘an image can be an focus with variable distance of an objecti
Where
u - Distance of an DUJONKA
Distance of an image.
the formula 8
1
↑
Focal length of the lens.
a
•
When applying to the eye, u is variable, and v is contant. Bhat for the equation to be fulfilled I must be variable. in is brought about by altering the radius of curvature of tău les which in turn fe changed by expansion or contraction of the siradiar muscles in the ciliary body which again, in turn, pull on the senblut, suspensory ligament or relax it. taking the lens thinner and thisker.
Hars 18ma 'simple diagram to show the relation of the formin applied to the 67*1/*
Obyut
Eyeball
Image formed
重
Kypärmetropia (Lona ažahi) (farsightedness) a
it is caused by focusing an image of a distant object behind the retina in the unaccomodated eye.
This is due to that a rafractive error in which the point of rocus for rays of light from distant objects (narallel light rays), se pahind the retina of the eye.
Thus distant ohiesta "dan pa seer slaarls, but near objects
all infants are farsighted Because of the developing ove
during their body growth and development.
It is corrected, in adults, by wearing suitable Convex sans whten can converge the light rays before entering the eye.
The method of correction is shown by dotted lines in the diagram belows,
[63 Kyusin" (nonraightoarmab) |
This is ouded by a refractive error in which the point pr fouus for rays of light from distant, ob jedla is in front of the retina. The viology of this cöfuel fè resulted in
17 Largeness 63', the syabais
2) an increase in the strength of the refractive power of the medik
3) Heredity which seeme co play a large role in myopia
4) In external factors such as amount of close work, lighting, rest
LVitamins, endocrine balanos, uzuraian etely
THE DELNOG or correction for simple eyopia is to wear, Byti ta bị {CobeRTS 201aßendoh divarga the light rays before entering timeyè,♬
The desced lines in the diagram below shows the
A Klinostat is an instrument used to demonstrate bothTM heliotropisn and geotropism. Its action is to nullify the effects of unilateral illumination and of gravity on the direction of growth of main stems and roots. It consists of a cork dise to which germinating
This disc rotated slowly by seeds, such as beans, can be pinned clockwork at about one revolution every fifteen minutes.
The disc can be made to rotate in a vertical plane, or swung round into ♣ norizontal plane.
• Plastic cover)
• Plastic.
Gammeligseed-
I fired on
the dive with a pen
Motor
Cork disc.
A Klimestar
An experiment to demonstrate the effect of gravity on the growth of «
gong shoot:
Seedlings grow honzontally.
Plastic cover
Procedure:"
Moter
Seedlings band woward
Four groups of broad bean seedlings are grown in soil in mna12 tubes which will fit into the plastic cover of the Klingstat in which
when ane coleoptriae: thore to a spring-holder attached to the cork disc.
have some out of the testa of the seeds (1.e. seedlings), the tips are mer hauf off the seedlings in two of the groups. One group of "out" sendiinge and one group of "whole" seedlings are placed on Klinostats as shown in. the diagram abovad. and revolved at four revolutions par minute (1... L revs/min), so that gravity can affect all sides of the plants, equally. The other two groups or plants are put on their sides.. The whole experiment has to perform in the dark in order to deprive of the affect al light.
Observation and Resulta
After a few days, all seedlings will continue to grow except only the whole? seedlings on their sides will have bent upwarda. Live, the seedlings show a nézɛtive gigtropism. The other three groups) (Mall continue to grow straipītais
Conclusiona
The group of whole" seedlings is affected by gravity equally on all sides. the seedlings continue to grow straight. This effect is brought about by the shoot tip affecting the growing region behind it.
The shoots in the other groups of seedlings by removing the tipa. of each seedling are influenced by gravity.
tip:
This change depends on the production of auxins in the shoot The auxins, hormones to promote growth, encourage the rapid division of the cells in the growing region of shoot tip. If the shoot' ia vertical, the auxina diffuse back from the shoot tip uniformly, so chat all the cells in the growing region will receive an equali atimulus, and divide at the same rate, resulting in straight growth of the shoot,
If, however, the plant in on jus 8108, the auxins will tand. to gravitate towards the lower surface do that the lower side will reostva more auxin and tend to grow at a faster rate than the upper siden
The tip of the shoot will consequently curva upwards. Once the #1]
upright, the auxin will diffuse equally down all sides, and growth wild be vertica 20
produced here
Scibers of hot top
Exercise for thia wanki
Fromany Region
Little auxin flowe
Auxin diffuser
under gravity.
Try Le compare the advantages and disadvantages of vegetativa: reproduction with reproduction, by seeds (sexual reproduction),
2 tabulate the similarities and differences of an aniIAN, SILIKA: tabeworm) and a plant parasite (e.2. dodder).
12. What are the differences between a saprophyte and a parasite?
What are the differences between a sulb and a Corat
Define photosynthesis. And explain, briefly the dechanism of photosynthesi
2.鉄軌每條長50呎,若要在20"F時,兩軌剛 好衮接则於30°F温度F舖設時,西几间
OR
将:-10°C的冰一克,变為101°C的蒸汽時, 需加热卡
4. 将同溫度之热水,分别监控里,玻璃
杯中则一杯中之水先冷;将冰分别 盛於此两杯中,則一杯中之冰光熔觧。 5 冬天時,接触金属物仟時覺得比接触其
他物件為冷,是因金属之
段
之故。
6.華代而攝氏之温棵相同之温度,是
度。
7. 将°C之冰塊,投入°C之鹽水中,则鹽水
之温度 而冰则
此因
8将 -10°C之冰50克投入0°C之水中,各热量
不会外傳,则此冰最後之重量為
8熔解時停槓膨脹之固件,當受压力愈大
其熔点:熔胖時停樸缩小之固体需 受压力愈大時,其熔點
固体所含雜償之数量愈多,其熔點
乙部
1. 有一吞積為400C.C.之空鉄鍋,重600元,高2ò
厘米,今覆盖於一盤水之大鍋中加热,问
((0).獲盖後鉄鍋中空氣之件槓,(6)當水淨 騰時、铁鍋中空氣之体穫,(c)當水沸騰 後
冷却至原来温度時,鉄鍋中空氣仵槓 又如何?设当時気压為76厘米水銀柱. 氣温度20°C
مریم
2. 一烧瓶盤有4條之水16仟克水高16厘米
今投以°C之冰360克,放於不傳热的租中 经相当時问後问(0)水之温度如何。” 冰剩餘若干?最後水高若干,已知冰 之比重為0.91.
提示注意冰浮於水中所佔的体棋。
3.河水深25公尺,若水底温度為4°C,
水面温度12°C,当時大气压
水银柱高。今有一无氾自河底上升,試 求此泡升至河面時,其槓体為原来之线
It 18 á gradua) - lessening of the power of macomodation dus. Lo physiologic change which becomea noticeable by virtue of blurred } hear vision, after; the age of 40.
A book ar newspaper, has to be naio at arm's length in order
to be read,
It is corrected by wearing suitable Convex lenses which increas the converging power surfisiently so fosus, the divergent rays of light:
is this called in plant?
dive the name of one example" of this figure.
Nama the parte, or tala
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