12 JAN1973
育教
頁一第張五第P八初月二十年子壬屣夏 WAH KIL VAT PO
報日僑華
四期星
1973英文中學會考試題預習專欄:
DE
1973英文中學會考試題預習專欄
123 KO AY PAY M
生物科
Biology (12)
(十二)
Answers to the questions of last
pollen tube stigma
Ovary
embrys sac.
style of a pistil
week
2. E
6. D 7. B
11: D
12. B
8. C
13
A
9. A 10. E
14. D
(1) sepals
15. B
(2) petals
questions for this week:
Select the correct choice for each of the following state- ments
1. For the process or photosynth- asis, a green plant requires
(A) carbon dioxide and oxyger. (B) oxygen and water
(C) water and carbon dioxide.
(D) carbon dioxide and carboh
drates
(E) none of these
2. A by-product of photosynthesis 19
(A) carbohydrate
(B water
(C) carbon dioxide.
(D) oxygen
(F) energy
3. The passage of gases into and
out of a leaf of the dicotyledon
is controlled by the
(A) lenticels:
(B) guard cells
(C) palisade tissue
(D
spongy tissue mid-veins.
Chlorophyll in a green lear
can be extracted by
CA soaking it in water (B) boiling it in alcohol
adding iodine to it
covering it with a piece or black paper
(E) placing it in a dark room 5. When a leaf that was kept in the dark is treated with iodine. solution after its chlorophyll was extracted, it will tum
(A) blue-black
(B) brick red
(C) cream colour
(D) yellow
E the colour of the iodine
solution
all of the following Ps
The carbohydrates made during photosynthesis may be used for
except
(A) protein synthesis
(B) gat synthesis
storage
energy production.
) transpiration
Green plants carry on respirat
during both day and nig
(B) only during the day
(C) only at night
(E)
only when photosynthesis Is going on.
only when photosynthesis 15 not going OI
8. In green plants, respiration takes place
(A) in all the living cells. (B) only in the green cells. (C) only in the epidermal cells
of the green leaf.
(D) only in the guard cells of
a stoma. (E)
in the stomata.
y. Which one of the following includes all of the others?
(A) Mesophyll
(B) Spongy tissue
(C) palisade tissue
(D) Chloroplasts
intercellular space:
10. All of the following are usual functions of a root except
(A) anchorage:
(B) absorption.
(0) conduction..
(D) protein synthesis
storage of food
11. All of the following are main functions of a stem except
(A) carbohydrates manufacturing (B) support
breathing
(D) conduction
transpiration
12. Fertilization in a flower, 18 the process of fusion of a pollen (male) nucleus and egg-nucleus and it occurs in the
(3) stamens (4) stigma (5) ovary
Which the above parts of flower becomes the fruit after Fertilization.
(A) (1)
B) (2)
(0) (3)
(D) (4)
(E) (50)
1) epicarp
2) endocar
3) seed
(4) mesocarp
The above are the various parts
of a drupe, arrange them in order from surface to centi
A) 1, 2, 3 and 4
B)
4, 2 and
(0) 1, 3, 2 and
(D) 2, 1, 3 and 4
B) other combinations
15. Which one of the following.
is not a part of the pistil of
a flower?
(A) style
(B) stigma
(C) filament
(E
of the following 13 found on the testa of a seed?
(A) endosperm
17
B) micropyle
radicle
plumile cotyledon
endosperm
(2) cotyledon
(3) epicotyl
(4) hypocoty?
(5) embryo
Which of the above can store food for the use of germination of seed?
(A) 1 or 2
(B) 2 or 4: (0) 4 or 3. (D) 5 only.
(F) 2 only
18. W Which of the following condit -ions does not essential for the early stage of germination of
I most seedst
(A) al
(B) moisture or water
(C) warmth
(D) sunlight.
(E) none of these
19. Which of the following is most important significance transpiration in a flowering. plant?
(A) For elimination of heat
energy.
(B) For regulation of temperatur
of the plant body
(C) affecting the process of absorption of soil water and minerals
(D) preventing the air moisture
from entering the leaves (E) reducing the process of
respiration
20. Flowers which are pollinated by insects possess all of the following characteristics except
(A) brightly coloured petals (B) large, and conspicuous
C) small and light pollen grains (D) sticky stigma
small amount of pollen grain
E', his k
II. (a) What do you understand by
Osmosis? How does it differ from diffusion?
(b) Describe, with the help of diagrams, an experiment to illustrate the process. in living tissues.
III. (a) What is meant by t
term "sensitivity "?
(b) In what ways do plants respond to common external stimuli?
(c) Describe carefully one experiment by which one of these response's could be lemonstrated
BMW ##
物理科(十二)
Physics (17)
Abnormal expansion of water
The abnormal behavior of water With temperature can be investr. gated with the aid of the Hope's apparatus. It consists of a tall cylinder filled with water al about 10°C. The central portion of the cylinder is surrounded by a freezing mixture such as ice mixed with salt. Two thermometers are inserted into the cylinder. as shown in the diagram
DRE AND SALT
hermometer readings are taken s regrianize interys ls. The re sult is snom in one second ére- gram won silows that tempera wirs. of 0 falte reproly and then assve El constant value over time, while the semperature regist -eres Lov Pro constant for a fe
ly long time and then drops PaDIQly tolavproximately sere.
日一十月一年三七九一屬公年二十六国民華中
"his can be explained as follows water has e maximum density at Co. Below 400, the density of water falls with decreasing temp- erature. Thus veter at the cent- ral part of the cylinder will be First cooled to 400. It therefore sinks to the bottom and the warm: water at the bottom (water at 10% will move upward. convectional current of water is established.
The upper half of the cylinder is still at about 10°C and therefore. the temperature recorded by P does "not change. Bu as the water at
the central part cocls below 4o0, it becomes less dense than the water below and will move upward. The warmer water at the top 19 now replaced downward and will be cooled by the freezing mixture. This effect. continuous until the water at the top cools below 4°C. Convection ceases at this point. In principle, the water near the bottom should not be cooled belov 4°C. The small dip in the temper ature curve of shows that Q Joes cooled below 4°. This 18 due to the conduction loss
reat of the water. But as water as a bad conductor, this conduct- 1on loss is small and so the drop in temperature is small. Since the density of water is
the volume of a maximum at 4°C, fixed mass of water is minimum at this temperature. The density of water at 0°C is less. than that at
4°C, the volume of the same mass”. of water will be greater. This means that water expands in volum When it is cooled from 490 to 0°C This expansion is called the anomalous expansion of water. One consequence of the anomalons expansion of water 15 that a pond cooled at the top by cold air wil have ice formed at the surface But a little below 1t the water) remains at 4°C and life in th gond survives.
Exercise },
doraemsi
A glass vessel hol mass of
paraffin at 0°C; baraffin will it hold a at 70000 The coefficient of volume expan- sion of paraffin is 0.0009 00: and that of glass 0.000024 FPC.
A weight thermometer containe FD Ke of
of mercury at 0°C and 0.019. (kg at 10000. If the coefficient o
res1 expansion of mercury is 0.00018 /PC, what is the coeffia- ient of linesr expansion of glass
1. The difference in length be-
ween a copper rod and an 1 rom
rou is 1 cm. ev 10°C. What must
be the length of the iron for this.
fference to remain at is om.
sen both rods are heated to 100°C Coefficient of linear exparision.
of copper is 0.000013)/°C_and_itha,
of Iron is 0.000012 100.
water!
How does the density of range as the temperature 15.000) 22 from 1000 to 00 CAY
pesom be an experiment or dete -mining the maximum density of water
solution to exercise ?a
Mass of the liquid expelled
50.20-47.67- .55 gm.
Apparent coefficient of expansion
of the liquid -
2.55
47-65x48 2-20,00134
Coefficient of cubical" expansion, of glass 19 3x0.00001 = 0.00003
coefficient of real expansion. of the liquid
0.00003 0.00334 = 0.00737 The ratio of densities at 0°C and at 40°C 18
gp
0.00137 ×
11.055
The real coefficient of' expansion of the liquid 18 calculated above as 0.00137/3 By applying the formula.
¥(t-to}n
have
ha-no
coefficient of rea 3100 of the liquid
50.24 50,00 20-24
1400x92
(=-572×10^2/001
One condition has been left out in this question, so cannot be determined
The condition missed is the alb weighs 56.57 gm. at 52°C when
mmissed in the liquid.
It is suggested the reader snouto ry this question again and solut on will be given next week.
The mass or water in the vitre flask at 4° as 1000 em. (aden- sity of water at 400 - af gm/oc){ Let M be the mass of water in the flask st 80°C.
Then the coefficient ostappe rent Expansion of water is (real ex pension of water) (cubi osl ́ex- pansion of glass)
0.0005 0.000009-
* 0,000473
Applying apparent coefficien
iss expelled.
mass.
we find
0.000473E
1000M
Y:(80-4
or 76 x 0.000473 x M. Solving, get M = 965 gm
1000M
Let 1 be the length of the
pendulum at 2000,
28
period at 2000 19 T-12T
Let 2 then 12
the length at 30°
10]/
and
18 the pEM OCIÁT
30°0
_1'( 1+10x) =>T;
The number of beats which the
pendulum måde 24x60x60
10 24 hours at 30°C
she no of beats s 24x60x60
50%
10x0.000019
0x6
The number of seconds in 24 hours is no. of beats X T
86400 1.000095
4088 in sec. in 24 hrs. 864001 864.00
1.000095
8.2
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