1966-02-03 — Page 14

二萬張四第

日四十月正年中丙磨复

WAHKIU YAT PO

四期基

甘三月二年六六九一室公年五十五國民中

中試題預習專欄試題預習

專欄

Of solution

物理科

(五)

蔡金明

生物科

Biology)

鑽力学問題

乙部問題

Exercise 5:)

Answers to exercise à

(有旅行櫈一張其尺寸如下齒静置於無聲 擦之地板上設有人$150磅生欄上其 重量集中於M處;若此稅可當作無重量計

B&C處竹受之力,並以备表明之,

X

12.有一邊度為59200厘米/秒之槍彈,在貫穿一層一層 米之木板行,随即射中一些重之鉛球而嵌入 球中设木板之平均阻力為50200牛頓,鉛球 重一仟克,槍弹官10克,問槍弹穿出不柏後之 速度及此鉛球受槍虫後座升高若干

是示:此题目之後半部為衝出擺之問題!

設有一串M之衝出擺受量為心速度為U+6 槍彈出中後,此擺在最低位置(即受槍魚蔚之心 位置)之速度為擺动之高度為力“如下备所

What part of the plant is this diagram?

(五) 徐錫禛R

This is a magnified surface view or part of a leaf showing a stoma at the centre. Y

cy Name the parts. from

At Epidermal celi

B

Chloroplasts..."

C1 Budlsus.

D. Stomatal pore.

Sa: A paw of guand celia

c) What nunctions will be performed by the help of this specific organ

* the centre of this diagram?:

(1) It controis the rate of transpiration of a plant.

(11) It helps for photosynthemi sẽ

(111) It helps for respiration.

d) "When will this spectric organ open and close?

This specific organ, stoma, can regulate one gain or loss of water vapour and gases by opening in the daylight and closing in the dark.

2. Khat is respiration? Illustrate with an experiment how a green plant

Respiration is a process by which the complex organic compounds are broken down, with the help of certain enzymed, to release energy for the use of the organism. The requirement for the liberation of this anergy by the chemical breakdown of the carbohydrates, such as starch, glycogen, fats and proteins, is the existence of fre oxygen,

In broad sense, enspiration takes place in the protoplasm of every living ell Lavalving the coidation of atored or digested food Bubstances by oxygen, resulting in the liveration of energy. In the cess of a carbohydrate carbon dioxide, water and energy are releasedi.

600, 611,0

Most tissues are capable of at least a limited amount of anaerobie respiration, while some bacteria are wholly anaerobic, Anaerobic respiration dous not release energy as efficienly as serobic respirations

C612 6-

- 20 H2OM 200

Apart from the chemical braakdown of food, the term resciration is orten äpnlied to the mechanism whereby the organism obtains oxyzen, eig, by breathing in Man, or diffusion through the stomata and lenticels in the flowering plant-

... In order to demonstrate the occurence of respirations in a green plant it is needed to prove that oxygen is used, carbon dioxide is given off and that there lo a loss of stores organic materials 1.0. a loss of Wight.

Green plants used for this experiment, are germinating pea seedlings. Which are put into a retort with one and dipped in the beaker of sodium hydrozida solution, just so shown in the diagram below!,

To deprive of the process of photosynthesis to take place the extem surface of the retort is blackened. After a few days, the caustic soda solution will have risen up the stem of the retort to occupy 1/5 of the total volume. Asjone-fifth of the atmosphere" is oxygen," and the carbon dioxide is the only gas which could have pean absorbed by the caustic and solution, this suggests that oxygen has been used up, and replaced by carbon dioxide, We can confirm that the gases left inside the retort do not support combustion by putting a lighted splint (which is extinguished at once), By doing this experiment a control set of retort which is simá but expty shows no significant charge, ♬

Secondly it needs to show thay vuring respiration of green planta loss of weight happens. This is performed by removing the same germinată pea seedlings from the retort. Then dry them at 1000 for a while and weigh until a constant weight is obtained. Take the same number of ingerminated pee seeda which are treated in the same way, By comparison of the weights of the two groups it is found loss in weight the group of the germinated group.

LESLLY, WE cho show the evolution of energy as heat in green plants. as follower

The germinating pan seedlings are carefully introduced into a hast-W Insulated chamber, such as a thermos flask. And another similar flask da ses up containing seedlinga killed by heating or sosking for a few hours in a solution of 0.15 mercurie chloride. The diagrams are shownij celow:

-Pen ssschlings-

-Cottonwood plieg

Rina of for degrees after expl

After two or three days there is a difference of few degrees in centigrade higher in thermos flask containing germinating pes seedling without treating with mercurio chloride solution. This shows that heat is evolved during respiration.

Un conclusion, "grean plants, when respired, use up oxygen, give off carton dioxide and liberate heat energy

In answering suen type of question, the definition of respiration should be aplicable to both plants and animals, The experiment should. te explained in detail. Including a few subdivisions of the experiment so as to make the problem perfect and to score utmost marks).

Exercise for this week;!!

則根据动量不滅原理?

MV =[M + M}T

TONO

sting pan achtinge

What Is the diagram of the plant represented fory Name the parts from A to. I'

What are the functions of A,D,H and It

d) What are three conditions needed for germination?

What is transparation grat 10 the 10gtrument used to messure the

relstive rate of transpiration and how it works? State Lalefly the atructure and functions of the stomata and root hairs in relation to transairations.

Y= mu/(M+n)

而根据能量之变换闹您,可得下式,

+ (Mon) x2 = (Men) gh

73 有玩無枝者順序連續拋高三球,便之皆

逗留在空間或在拋擲中,設三球均曾20元, 拋球時間為2秒(即由緊握球之手上擲用 始而至球离手之時間),接球高時Q3秒(四手 触球闹始而至手握球重要最低位置之時間)其 中間隔2秒,並设接球後跟着抛品,並無 伴器,問(0)此球应抛高若干才能連環拋

球時平均用力若干?

提出,设三球分别為甲、乙、丙,则中球剛离手拋

出後,其逗留在空中之时间内应经历為:

小間隔2秒

[(2)

●接乙球

拋乙球

(3)間隔:0.2秒

(4)接丙球,抛出丙球

(5) 間隔 の2秒

(b)甲球到達

一横桁長10呎,一端以飲連於壁上,另端繫 有害1000磅之物体,並以绝建结之前 播上, 其形状累如到各由,試用菌群及計算方法 ̇求出各孟中绳之張力及横桁所受之压。

(d)

15 有一打棒机,斜中一噸,設籍之最高位置面

椿頭距离9呎,且每四秒打一鐘每鐘将椿 打入四吋,若色鐘間並重停留之時間,水的作 用於椿之力(山)打棒机此時之馬力。

提示:每鐘之間隔時間=鐘上升時間+結下墜時間

電話:+擾之湯入時間

提示

MB

(a) 摩擦力与速度重関。

白若在一定時間內滑行之距离加倍,

速度=距离時間

故平均速度亦加倍。

而加速度=速度变他時間 故加速度亦应加倍。

有一獵人以仰角300之槍弹击中一歌手张翔之飛 马,弹鸟体内,设此与离地50米,重200元,速 度為5/秒,槍弹賣10元,速度為500米/秒。求(日) 此写下落之時間,鸟语處与獵人之水平距离。

分別計算

8有一河水除6米,橋面距水面8米,一石塊级重 直拋高5米後,隨即跌入河中,設此石塊之比 重為3,填量為200克,若水之阻力可免計算,問此 石塊自离手後需時若干才落至河底

6(0)如下番所示,設A賣2磅,乃至10碟,此两物 体以绳结跨連扲 -滑輪組上若A、B間&3. 平面間之摩擦係數均為03,今以力P向左作 寻達運動間P為若干?(設滑輪真业摩擦力 山,古如下面所示,A.B之曾量面100同,但设A, B間及B书平面間並無摩擦,今以力P使B向古提示, 作:32.2/秒之手加速度滑行,問ㄗ為若干磅,

(C)升如下面听示,A.B之重量及其間之摩擦 係数均有10)同,若要便B向左作32.25/秒之 等加速度運行,問P為若干磅。

總共所需時間 石呢上抛時间

+下降至水面時间 十由水面降至水底時间

̇面計算由水面沉至水底所寓時,间,須注

黄水之浮动心