1972-12-29 — Page 21

REFERENCE LIBRARY

29 DEC 1972

/曾任頁一第强六第日四廿月一十年子主腦夏 WAH KIU YAT PO

(十)

#千間間中

助官

私立小昂:四八!

安助小:*三四

「各」校主

糖辦

日橋害 五期星

九如入校 莫分由私

受匠人辦之

【 1913英文中學會考試題預習專欄。

生物科

(Biology(10)

Answers to the questions of Last week

1. What is meant by pollination is flowers?

Explain briefly the types of pollination.

How does a wind-pollinated flower differ from an insect-pol. Linated flower?

Ans. The tranaférence of poulet from the anther to the stigma is mown i pollination. If this. takes place within the same flower as in the pea or bean, it 18 call- ed self-pollination; if pollen is transferred from the anther af on flower to the stigma of another flower, it is called cross-pollin- ation. Cross-pollination:may be accomplished in various ways, i.e. by insects, wind and animals. Anti -ficial pollination is employed to 1mprove. varieties of flowers of plants, and in which the pollen from a selected flower is tran- eferred to the stigma of another: selected flower by manual operat

Fron

The gynoecium includes a single carpel with marginal placentation. The carpel has three parts, the stigna, style and the ovary. The

Ovary bears a style which is bent: in a similar way to the stamens

and has a terminal hairy and brusk -like stigmaL «

Lateral petal Posterior petal

(wing)

Stigma

(standard)

-Free stamen

-Anterior petal

(Keel)

Calyx

Flower

Stalk

Ovules

Style

Receptacle

Ovary

全港各類學校間數:

學。

校

現已印貓,各界人士吉

小學其次共六三四間 私立夜中學 有一三五間 官立夜中學則僅有二間 幼稚園爲數最多 共七九六間 資助

一千八百零一

咄告慰之中交部本現正在-

印中,一侯刋印完波,即公開致供。

日九十月二十年二十九一股公年一十六国民曄中

爲應育教修先業職制年三

節環要主育教學

府政請促組小作工育教修先業職 要重之育教等中在育教項是意注

展拓先率以予府政議建復性故

默里必下校此其纇能。潋迷所由職先該 EIC

現雄

The following table is a com- varison of a wind-pollinated. flower and an insect-pollinated: flower:

Wina-pollinated

Flower

7. small, incon- spicuous, often with green.or colourless petals

" Secretes not scent and nectar.

produces large amount of -smooth pollen grains from large anthers,

4. Anthera usually hang out of.the flower exposed t the wind.

5. Feather-like” stigmas are pro- truded out of the

| flower.

6. The styles of

| the flower: are

usually tong and elender,

Insect-pollinat

ed flower

large, conspi cuous, often with brightly coloured petals

possesses scent and neotár.

produces amall amount of

rough pollen graine from small anthers.

Anthers are hidden in a position with− in the petals

sticky stigmas are located: inside the flower.

The styles of the flower are usually short and atout....

2. Describe, with the help of a Lebelled diagram, the structure

of a named ( insect-pollinated flow:

and state the function of the irious parte of the flower. What changes would occur in the parts of the flower after fertilization: Ans. The basic parts of a sweet pea flower are sepals (calyx), petals (corolla), androecium and gynoecium.

The calyx of the flower is made up of five sepals which have point -ed tips and are joined together: at the base.

The corolla has five petals. Two of the anterior petals are

Ised so there are only four free parte of the corolla, They are:f

ned, the standard, a pair of smaller lateral petals, the winge. and the keel (fused anterior pet- als

The androecium of this flower consists of ten stamens enclosed. in the keel. The lower parts of the filaments of nine of the stamens are joined together for two-third of their length ao as to form a tube which has a narrow slit along the top. A single free stamen fills up the slit. The other free ends of the stamens bend upwards at right angles to the keel.

Stamen tuba

A Sweet Pea Flower.

Functions of the various parts of the flower and the results of them after fertilization:-

(1) The sepals (calyx)---- are to protect the flower during the flower bud stage. They wither gradually after fertilization of the flower

(2) The petals (corolla)---- arę the coloured parts of the flower end are able to attract insecte to aid in pollination. At the base of the petals is the presence of the nectary gland which secretes

nectar possessing pleasant smel1 and sweet taste. They also fall off after fertilization.

(3) The androecium (stamens )---- the stamens bear filaments to which the anthers are altached. The anthers produce pollen grains for the next generative species. The stamens disappear after fertil. lization.

(4) The gynoecium (carpels)-- each carpel is made up of

(a) the stigma----with rough top surface which the pollens fall on or adhere to, After fertilization the stigma may remain to become part of the fruit.

(b) the style----is a slender stalk for support of the stigma or for forming a passage for the germinating pollen tube to pass

·through during fertilization, after which it becomes, in some plant, a middle part of the fruit. (c) the ovary----is a swollen bas of the carpel making up one or more chambers in which the ovulea are kept. After fertilization the ovary develope into a fruit.

(d) the ovules----They are small round bodies with life storing in the ovary of the flower. After fertilization they form the seeds.

Questions for this week:

1. (a) What is the process of poll-

ination in a flower? Des- cribe how a seed develope from a ripe ovule.

(b) With the aid of labelled

diagrams, briefly discuss the structure of a named eeed...

·(a) Explain what is meant by

epigéal and hypogeal germin- ation?

(b) Make drawings to 11lustrate

the process of germination in a named seed,

(c) State olearly the functione

of cotyledons in the differ- ent stages of germination: of this geed,

1978

中文中學會考試題預習專欄 數學科(十) ·張正邦

第九次預習題解答 足因口中服為走弦,肥為動弦,以服 AC 為鄰邊作平行四边形 BDC 求对 商綠美化E的軌陷

(解) BDCD 平行四电形,因平行

互相平分,所以交 點即為其对肉線的

中點,故其軌鸡就是等於求BL 张中點E的軌陈书法如下述 $38 OF EIBE - EC, & OE LBC, K LOEB = IM PPERE & WOB 為直徑的国周上任-點E.引BE: 並延長使美国口於C,因LOEB-直年 所以E⊥BC得EC作平稳一出

H3 BDC則E便是时尚線的支點

點使BE=AD求BD.CE绠點P的

所以& D

(解)

a. 設為合於條件

1996 ALL ABDÁ ABEI

9.AB=CB. AD-BL

Z BAP 2CBE & CBE

LBEC 故日务

* LAT L·EPD =

* LBPC =120 Fir

弓形開身於 120

6.在此弓形

CPBAA

和ABCEA

+ 4BCP=60.又因 LPSCT LPBE

BP

PIC

2 ABD 2 BCE ELAZERCELL PBBC & ABD = ABCE (asa)

故D=BE 即ABC上的點合於所設 條件,故所求的軌跡是以腰為法會 弓形国等於120°與A同侧的弓形弧 BC

1. A BREBAXOY GOD OX LES ENK

引 BP的重線這一直線相Q,求P阪的

設M是合於所設條件的點,則

告分百及管主保建

∠PA& =LPBQ = 直用,即A、B两點在 以PQ為直径M為图心的国網上 AM BM 均為半择这AM=BM,因此所有合於 條件的點必在骨 B的中

直於胗的直線上,因M為周期AMY

OC PP ECLEAR-SED LEAD=0C 则M不能在CD上 因此合於 所設條 件的點在DL上,

b. XD LEEK MYS AM=BM AVEW

FE AME ADROC #FA MIX Ror 相关,支點加P联PM 坐長 PM美国周於 Q則阻為比因的直径 即API AP | BQL BP. BM是PA的中點,即合於所

設條件,故所求的轨剛是L

4. LXAY的边AX上有一定點B在AYE 任取一點c作成三角形ABC, 求△ABC 的内心0的軌跡

解。因吧

PIBC 15 19 NO.

乙内心在LXAY的平分線上,但不是

6. 若C在Y上,但跖月無限膙則BCA AY Fru & Bak BENAY 1122 ABELS 粉鎳更P於F即内心日必在上 - 在肝上任意取,60联BO B ALOBC LABO

那是那但胙临除外

PARE b-c2 = a(bGDC-CCPB).

张右端=a(b@C+coB-2com

ala - 2C CoB)

a - 2ac GoB

a= (a2+c2-b2 )

b2-C2 = 右端

2. }^2$ < c2_b*) (n^A + (a^C^) WE

+(62a2)C°C =0

££ £3b=(C2 b)(1−4in (1) + (a2

c

"Sm? B+b2=b5wic

SWB

CSWA

第十次预事題

試既下列各等式,

1. a( (pR-SMB) +b (COR+SmA)

(b+c) CoA +(c+a) Gp8+(a+b)

xinC=a+b+c

ASMB

cialaB®

tank

16=C2) GXA+CCa2)&*B+Ca2