1973-01-04 — Page 25

(1) What reason is given for

- 5 JAN1973

CITY HAUS 育教僑華頁一第張七第日一初月二十年子壬魔靈 WAH KIU YAT PO

鄩日僑華

四期里

日四月一年三七九一层公年二十六國民藝中

Radicle

Advent

Epigeal Germination

1978

中文中間會考試題預習專欄

英文科(十一),徐有滕·

1913英文中學會考試題預習專欄

生物科

BIOLOGY (11)

(+-)

Answers to the questions of last week:

(a) The transference of pollen from the anther to the stigma. „IƒA is known as pollination. this takes place within the same flower, as in the pea or bean, it is called self- pollination; if pollen is transferred from the anther of one flower to the stigma of another flower, it is called cross-pollination.

Pollination is the first. step in the fertilization of € flower. Following double fertilization, the ovule becomes a seed. . The fertilizea egg undergoes numerous divisions to form an embryo. At the same time, the fertilized endosperm nucleus divides to. form many large cells in which food is stored for use by the embryo later on, when the see germinates. The outer cells. of the ovule surrounding the embryo sac become the covering layer of the seed or testa

Testa

Cotyledon

plumule

Micropyle

Hilum

External Feature

Radich

Internal parts

Broad Bean Seed

The parts of a seed can pe seen by studying a large seed, such as the broad bean It should first be soaked in water for several hours. On the outside of the testa, along the narrow end of t seed, a scar, or hilum, 19 easily seen; it shows the point of attachment of the seca to the pod. Near it, the tiny. opening is the micropyle. If the bean is split open, it can be seen to have two large cotyledons, each of which containe stored food. The remaining part of the embryo contains the epicotyl and its tiny plumiles, which make up the upper part of stem and Leaves of the plant, and the hypocotyle and the radicle, which will develops into the Lower part of the stem and the roots respectively.

It

(a) During the germination or a seed the cotyledons come above the soil level and develop into the first foliage leaves. is known as epigeal germination. e.g. the seed of castor oi. plant. In the hypogeal germination the cotyledons remain under the soil level. and gradually give up their stored food for the development of the plumile and radicle. e. the seed of broad: hean

(b) The process or epageal germination in a French bea seed is illustrated as the following:

Arched nypoctyl

Elon's radicle

hous

In A French Bean Seed

On germination the radicle which first emergės downwards, and then the hypocotyle straightens and lifts seed out of soil level, The testa of the seed drops. off and endosperm can be

on outside of the two cotyledons. Enzymes from thi cotyledona digest the endo- sperm into soluble substances. which are passed to the developing shoot and root. When the endosperm is all used the cotyledons open out and form the first pair of foliage. leaves

(c): The cotyledons, after exposure at the surface of the soil, grow apart and develop chlorophyll. When the storea food in them is consumed completely they are able to make food for the growing seedling by photosynthesis for a certain period of time.

Simultaneously they also can secrete enzymes to change insoluble food into soluble food which is then absorbed by the plumule and radicle.

They also act as protective coats for the young plumule which lie between them at the seed stage and during the early stage of germination

Juestions for this week! Select the correct choice for each if the following statements.

Respiration in green plants releases

(A) alcohol

(B) oxygen

(0) carbon dioxide

(D) carbohydrates

(E) sugar

2. The young plant in a seed is

called:

(A) cotyledon

(B

endosperm

(C) plumile

(D) radicle

3 embryc

The seed carries out epigeal germination is.

(A) broad bean seed (B soy bean seed

(C) pea seed

(U) castor oil seed

E maize grair

During the germination of seed

(i) only the cotyledon is

lifted above soil leve (ii) both the cotyledon and

above

soil level.

(iii) both the

radicle remain below soil level

plumule and

fiv) only the plumüle and hypocotyl are lifted above soil level.

Which of the above indicates the process of epigeal germination?

(A) (1) (B) (11) (0) (111 (D) (iv) (E) none of these

A root may perform all of the following functions except

absorption of water

(B) absorption of minerals

() fixation

storage of food.

carrying out photosynthesi

111 of the following materiala.

an pass through a semi- permeable membrane by means of diffusion, but except

soil water

dissolved minerals iodine solution starch powder red ink

In the dark, a flowe

plant eliminates

(A) hydrogen

(B) carbon dioxiue

(C) oxygen

D) glucose

E) liquid waver

201len grain are produced in the part of a flower called

the

ENGLISH

The following passage as typical of the kind of passages candidates are asked to attempt

in Paper 3.Read the passage. then answer all questions.

Traffic problems are causing serious concern in Hong Kong. The tremendous growth of population in recent years places a heavy burden on public transport services. The rise in the standard of living enables more e and more people to own cars. The number of vehicles of all types is far too great for the Small mileage of roads, Many of these are narrow and winding and are unsuitable for the speed and volume of present day traffic. To make matters worse, carless pedestrians often wander off the pavement and add to the dangers. of the road

Many attempts have been made to solve these problems. The widening of roads, the straightening of dangerous comers, the construction of new carriage-ways and fly-overs for cars and of subways for pedestrians, áll help a great deal. But more imaginative plans are called for. Traffic must be considered in town planning. Since cars are here to stay, they must be used safely and beneficially. With this in mind, a group of town planners, architects and engineers who have studied traffic problems overseas have suggested building the reclaimed area in the Central District in three layers.

Traffic would circulated at the ground level, pedestrians would be free to go safely about their business or pleasure at the higher level and the third business or pleasure at the higher level and the third level would be used for car parks. This may well serve as a model for the planning of new towns..

Questions:

(A) For each of the following

words or phrases find a word of similar meaning in the passage:

(1) anxiety.

(2) makes possible

3) possess

4) kinds

(5) people walking,

(6) building

(7) roads built underground (8) won back, from the sea

move about or around

Answer the following questions, according to information obtained fr the passage:

(A) corolla-

(B) stigma

anther

Ovary pistil

The structure which includes

all the others is.

(A) androecium

(B

stamensT

(C) pollen grains

(D) anthers-

(E) filaments

The female gamete produced by

a flower is found originally in the

(A) pollen grain

(B) pollen tube

stigma

(D) anther

embryo sac.

A bean seed contains all of the following except

(A) seed coat

(B) epicotyl

(C), hypocotyl

(D) endoplasm

(E) cotyledon

An experimental demonstration to show that germinating seeds. carry on respiration, which one of the following would be used to test for the presence of carbon dioxide? (A) hydrogen peroxide

the crowding of buses and trams?

(2) What shows that people are

better off?.

(3) How can pedestrians ner to keep the roads safer?

(4) Name two ways in which

present roads are being improved.

(5) What else is being done

to speed up the flow of traffic?

(6) What did une group of town

planners, architects and engineers do overseas? Explain why there would be less danger of pedestrians if the reclaimed areas in the Central District were. built as suggested.

candidates should read over he above passage two or three imes, until they really understand it, before attempting the luestions, particularly the ": questions in Section (B), other- vise they will more often then not,

ive the wrong answers, Digest he information contained in the Jassage thoroughly,› Do not jump Go conclusions. Full answers to

11 the questions in this exercise ill be published in next week's ssue of this column

The following are answers to last week's

sue::

(1).0

(2) P

3)A

(4) D

(5) B

R

·(7) P

(8) R

(9) S

10) Q

Jarlier on, candidates were told that Paper 3 consisted of comprehensi on and Translation. Comprehension has been dealt with It is now fitting and proper to

Candidates go into Translation. are required to translate one passage in English into Chinese and one passage in Chinese into English. The following is a typical passage in English to be translated into Chinese

The orange is a very common fruit and in my opinion the best It has a delightful, sweet taste which I am very fond of. It is good for the health. It is safe to eat because it is peeled before it is eaten. It is round and young children can use it for a ball and can flick the pips at thei enemies. Moreover, its honesty. appeals to all of us. If it is going to be bad for the best of us are bad sometimes - it begins to be bad from the outside. On the other hand the pear often looks fresh but it is rotten inside. But the orange has no hidden faults. Its outside is

mirror of its inside. If you are quick you can stop the shop- keeper Before he slips a rotten one into your bag

14

lime water. alcohol

calcium chloride

(E) iodine solution.

The part of a flower that develops into a fruit is the

A) ovary

ovule

(C) style

(D) stigms

Stamer

In showing the requirement of light for photosynthesis,

iodine solution was added on the surface of the leaf which had been đecolourized. process serves:

This

(A) to preserve the lear (B) to act as a disinfectant: (C) to stimulate the action or

thể chloroplasts

(D) to determine whether

starch is present in the part of the leaf that was

overed

(E) to supply a necessary

element for photosynthesis The part of a flower, which receives pollen during pollination is

anther stigna (0) receptacle

style ovule

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買二第張七第2日一初月二十年子壬歷夏