REFERENCE LIEG
育教倭華頁三第張六第一日五十月四年子壬歷夏 WAH KIU YAT PO
報日僑華
27 MAY 1972
·CITY
六期星
日七廿月五年二七九一曆公年一十六國民華中
英中會考數學科答案
英中會考生物科答案(二)
堅道英文書院.
thematics
(Lemmon, 30)
Solution to Mathemation syllabus à, paper IX,
(1) Consider ons litre bottle of pure
Amount of water - 0.8875 1. 10.0275 1.
Amount of fat mom
Amount of non-fatty solids – 0,085 X Suppose I litre of water, y litre of fat and litre of non-fatty solide were added to the pure milk and one litre of the mixture was analysed.
0.8875
100
108x 3808
1020
510
10810
52 100 5200
堅道英文書院
BIOLOGY (30)
HONG KONG
CERTIFICATE OF EDUCATION EXAMINATION
ENGLISH), 1972
CONVENTIONAL QUESTIONS
combustion tube
erminating, noods
橋
Kammals and birds requirÉ MOTS
oxygen than other animals of the ZÄNG
sise because they demand larger amounts
of energy supply, which can be achieved by quicker rate of oxidation of food (respiration)...
A large quantity or energy 18 necessary to maintain a constant and high body temperature being wara- blooded, and to support the body. and to keep it in motion on land in the air..
Question 4. MNOWWA
(a)(1) Kake a simple labelled drawing of the bones and susoles (blospa and tricops only) involved in the more ment of the forearm at the elbow joint.
0.0275
0.085+
+x
Solving (1), (2)
0.25
(3) wa obtair,
only water has been added,
Amount of water added
x1-11tr
·0.25
Etlitre
Volume of the swinmang DOJI
50
26.2 x 0,043
0.066
(b) (48.13).
(48.13)3
log(48.13)
(1.6824)
0.5608
3.638
26.2 0.043
0.066
-19826.2
066
6 x 50 x 10 ouẩm,
(a) Bate of the pumping or
water
17.07
18000 1/min.
18000 x 1000 cu.m.
18000% 100
√20.71
4.551
105
Taken to fill the poo
6 x 50 x 10 x 10'
18000 x 1000
187
(b) Volume of the unfilled poor:
650 x 10 of,fie
x 0.043
-0.066;
Lov d. bo the cost of a badge Lot a bo the number of badg
2250 ou..
(2)
3000 - 2250 omiño 750 ou..
Depth of water at the shallow and
∙150
20 250
སྦྲུ
600
(2)
200
400 x 600
400
600 x 10
12000
(3) and para roots of me
From (1),
(2+B)2
(11) √ 3 + B3 = (α+B}{* • B¢ -<B>
(-4) [28-(-6)]
- (-4)(34)
136
(iii) The squation whose roote are
(L2 + B2)
(26 - 136)z + (28)(−136)
When
400
12000
400
80
50
2000 10
3200.
1200 badges must be mado if the opst is to be 60 cents
(11) when 'n ➡ TUDO
50+ 12000
62
If 1000 bunges are made per badge in 62 cente
Derren
beaker of coloured water
(a) Diagram 11 represente a piece or apparatus at the start of an. expariment.
What is the hypothesis that experimental set-up is endeavour Ing to verify?
This experiment is to verify that oxygen is used up and carbondioxide is liberated during aerobic respiration. (11) How would you prepare a control
for this experiment?
The control for this experiment should be set up in a similar way ao shown in the diagram except that steri-
ised boiled goods are placed in the conical flank instead of the germine- ting seeds.
(iii) What would you expect to observe during the course of the experi- ment?
The water, 200
VALD KASH
tube will rise, but that in the control will remain constant,
(iv) How would you explain the resulta? As a result of serobió respira....... The oxygen inside the air-light- conical flask is using up by the gere minating seeds which in return liberato carbondioxido
aerobio
respiration.
carbon dioxido + vator + energy. The CO2 released is absorbed by the conă. KOH, thus reducing the pressure inside the flank. As a result water. is sucked in from the beaker to replace the gas honce the rise in the water lavəl,
Oxygen + Organic food-
The six in the controlled Tiank renaines, unchanged because there is- no respiration. That is why the water level in the tube rasaina tha Kama
(v) What complication would occur in
this experiment if the germinating seeda had begun to show gremleaves?
As soon as green leaves appear on the germinating seeds photosynthesis takes place, resulting in taking up of CO, and liberation of O̟. This process- helps to consume the Co, liberated
2
from further respiration, and to replenishe the oxygen used up previously for the oxidation of organic food, As the volume of Oxygen is increasing the water level in the test-tube will begin to fall.
b) How would you distinguish between
external and internal respiration?
External respiration is also called breathing. This is the pro- dess of gaseous exchange between the living organism and the external environmant i.e. to take in oxygen and give out carbon dioxide.
Internal respiration is the trus respiration during which organic foold substances are broken down or oxidized to relegas energy for the antivities of the living body.
External respiration is a simple physical process, usually takes place. by diffusion. While internal respira- tion involves chemical reactions and the liberation of energy.
External respiration concerns
an exchange between the body surface and the external surrounding, while internal respiration occurs insida the living cells within the body, the body. External respiration is only accessory process of respiration. The latter's chief aim is to facili late internal respiration so as to produce energy.
5) Why do mammals and birds usually
require a greater amount of than other animals of the same Biser
oxyge
( muscles) biceps
Vadius
Lange Carpals
etacarpats forearm
triceps Cendons.
elbow joint
Diagram Showing susoles and bones of arm related to the movement in man
ii) Give a full explanation of the
mechanism by which the forear 18 raised.
The conscious centre of the brain gives the decision to raise the forearm, Nervous Impulse originated there passos along the nerve fibre to the motor centre of the brain from where the mOBRAZE continues to travel down to the spinsa cord and then the spinal nerva which innervates the bioeps. Âm the nervous mengage reaches its destination the bicepa responds by contraction. At the same time the triceps relaxes. The contraction of the kioeps shorters the muscle and exterte palling foros on the forearm through the tough tendons
As a result joining to the radius bone, the forearm is raised
(b)(i) What is meant by tropien?
Tropism is defined as the direc tional growth movement of the plant body in response to external stimulus. The growing region may respond by move ing slowly towards the source of stimulus, which is called positive tropism, or away from it, which is oslled negative tropism, ii) State THREE different tropisms and
in each cans the stimulus which initiates the response. Explain the importance of the three tropisms. to plants living under natural conditions,
The three common tropiems exhibited by higher plants are
11. Photo
(2) Gsotropiam
(3) Hydrotropian-
responds to ligh stimulus.
responds to gravita−) tional force.i responds to dirrerende in concentrations of water.
The shoot of a plant is positively phototropic and negatively geotropica In other words the shoot is growing upwards towards the light from above and away from the soil. This behaviour enables the leaves of the plant to get the maximum intensity of light for photosynthe
manner.
The rock is pehaving in the opposite It grows away from light and shows positive geotropism. This facil-1) itates the anchorage of the plant body firmly on the soil by the root and enables it to Berch for mineral salt and water.
The room suv responds to water by. growing towards a region of higher water concentration. This helps the plant to obtain enough water for growth and main- tenance of life.