1981-12-19 — Page 21

either stand up ag a

六期星

育教僑華頁一第六第 日四十月一十年四季蘑

WAH KIU YAT PO

報日僑華

Stage III: A mature delta

1982

ridge where the dyke

kand.

中學會考試題預習專欄

(十一)

rock is more ressistant

than its adjacent or

rocks) or be worn away to form furrow (where the dyke rock is less

地理 明德出版社李險業 提供資料,ressistant. than its

adjacent rocks).

GEOGRAPHY (11)

YoY. Lee

MILL & DALE PRESS LTD.

21. The figure, below.

shows a local physical feature. name it and explain its formation.

uggested Answers:

B is a dyke

The formation of B

Dyke, as a form of occurence of the

hypabyssal igneous rocks, 19 a sign of igueous activity. With the release (of crustal pressure, the molten magma fills the vertical joints or faults in the earth crust, and is solidified at last when cooled. As it is a

a mass of intrusive rock which cuts discordantly across the bedding planes of the parent rack, there may be a marked differ-

ence in their resist ances When affected by

ffecte denuntium, it wil

22。 Describe the main

characteristics of the: physical: land- scape of a delta. Explain fully- the formation of a delta.

Suggested. Answers;

Main Characteristic Features Of Belte:

A delta is a lowlying awampy plain built up at the mouth of a river by its deposition, It is crossed by numerical levee flanked distribu- taries. Kemnants of the lagoons, and marshes formed in its early stage can be found. The seaward edge of it is fringed by spits.and bars. The shape "and size of a della very according to the amount and Lype of loads. deposited and the mode of accumulation. The common shapes of deltas are arcuate, bird's foot and

estuarine.

Formation:

when a stream flowa into a body of standing water, such as a lake or en ocean its velocity and transporting power. are-quickly steamed. If it carries enough load and if the estuary.it. enters is shallow and free from tidal current for strong ocean current,

e delta-will gradually be built. The stages in the formation and development. of a delta can he.. summerised, as follow: Stage: 1:

At the estuary, abundant loads are

dropped. These loads will be coagulated when they

are

in contact with sea

water. The river is thus

choked and therefore branches out into several distributaries. Spits vand bard arise, and lagoons are formed, The

levees of the river extends seaward via the

distributaries. Stage II:

When" more sediments are deposited, the lagoon

will be gradually filled

and they become swampy. The delta begins to assume a more solid

appearance,

Stage III:

The old part of the

Lagoon..

Sediments

consolidated.

物

生

》

明德出版社綖永華 提供資料

delta is slowly raised by BIOLOGY (11).

further, deposition with

the aid of the colonize- tion of vegetation, Swamps gradually

disappear and this part of the delta becomes dry land.

SKETCH DIAGRAMS SHOWING THE FORMATION OF A DELTA

Stage I goons are.

enclosed

Land

Sea.

-Levee-

・flanked

distribu-

taries.

Stage II: The delta/

begins to assume a shape

Land

O

Lagoons

Filled in lagoon

(Swampy area)

W.W. Leung

MILL & DALE PRESS LTD.

Unit 8: Transport in

Organisms:

1

The following diagram

7.ws an experiment.

to

investigate

transport in stem.

moist filter paper

a herbaceous. stem

red ink solution

vertical

section 6:

the

stem.

red areus

A vertical section of

the stem shows distinct red areas. Nuse the tissue which was stained red. b) What are the factors

that caused the upward movement of the red

ink soliti on”

c) Give 2 reasons to

<explain why the: Loss

of water from the:

moist filter paper

cannot truly

represent the loss of

water from the leaf.

日九十月二十年一八九一座公年十七國民華中

d). State one practical precaution when

setting up the apparatus.

2. The diagram below

'showa a.model plant with a developing. fruit.

apex

-young leaf -mature Leaf A

muture deaf

fruit

SOIL

Name the plant tissue which is responsible for the translocation of food substances?

b) In what forms are (1)

the carbohydrates (2) nitrogenous.

substances transported in the above tissueT Give 2 reasons to explain why they have to be transported in these forms.

d) Where are the fool:

substances produced. from leaf A transport- ed to? Why?

Suggest, with explan- ation,

(1) 2 methods by which a bigger fruit can be obtained.

(2)

a method by which

a taller plant can be resulted.

Ansvers

1a) Xylen

1. Capillarity

2

The pulling-force produced as water evaporates from the moist filter paper.

The loss of

of water from the leaf can be regulated, Water is lost

mainly through certain holes :

(stomata) on leaf

surface rather

than the whole surface.

4) The stem should be

cut in water to prevent any air blockage.

Phloem.

1. Sugars/glucose 2. Amino acids

c) 1. They are soluble

in water. 2. The

can diffuse

through the cell membrane of the plaat cells.

d) To apex and the

young leaves. The

is an

owth region) requires food :supply- for its:

growth. The food produced by the young leaves is insufficient for their own growth and theréfare ・.external food supply from nearby mature leaves. is needed. e)(1)1, To remove the

apex and young leaves:go that møre food sub- stances from the mature leaves can be translocated to the growing fruit. To remove a

ring of bark/

to ring just below the grow.

ing fruit so that food sub- stances cannot

lie translocated to root anu therefore more food substances accumulated at the growing fruit,

To remove the young leaves: surrounding the apex so that the growth of the apex is enhanced and a taller plant would be resulted.

教

家資

育

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