四期星日一月五年九六九一醫公年八十五國民華中 育教備
真三第張六第日五十月三年商己腦夏 WAH KIU YAT PO
報日僑華
1969*
中學會考試題預習
僑
生物科 (廿六)
百雄
BIOLOGY (26)
試題預習 文中學會考
(接第六張第二頁
C
現代數學科
(廿六 )
Vertices. of polygon
B (44,0)
D (0.3)
B (2,1)
20
+ 0 =
0 + 34
2 + 13
You see it is the ordered pair B (2,1) that yilida the value for a least total weight of the two substances.,That is," for each day a person. must take 2 lbwa, of X and 1 lb. of I. at least.
(2) A farmer wishes to buy a number of cows and
sheep. Cows cost £18 each and sheep cost £12 sach. The farmer has accommodation for not more than 20 animals and cannot afford to pay more than £288. If his reasonabla expectation of profits is £11 per cow and £9 per sheep, how many of each should he purchase in order to make his total profit a-sazimum.
Solutions
System of constrainte
<=20 18x+12=288
Objective functioni Graphy
f(x,y) • 11% 93
Answer to las, questione or last week
1. Write on the line at the right of each statement
or question the number preceding the word or
ARS
expression that best aompletes the statement or "anavers the onestion,
3.
4.
NEW
9. (4) 10.
12.
What is reproduction and why is it necessary? Give a short account of asexual and sexual reproduction, Illustrate your answer by giving. one example of each type of reproductions in animals.
(a) Reproduction may be defined as the process by
which living organisms are able to reproduce their own kind. Since individual organisms grow old and die, the survival of the species depends upon the replacing of these individuals' by new onea,
(b) The procesa of reproduction varies tremendously
from one kind of organism to another, but we can distinguish two basic types of reproductios, the asexual and sexual reproduction.
Asexual reproduction occurs commonly in plants, protozoa, caelanterates, bryozoa and tunicates. A unicellular animal, amoeba, during asexual reproduction divides itself into two pore or lese equal parts, each part, growing until it has acquired the usual size of the fully grown organism.
in sexual reproduction,it involves two individuals; each supplies a specialized reproductive cell or gamete. In man a male gamete is called the sperm which subsequently fusas with the female gamete, the egg, to form the fertilized egg. This process of fusing of two gametes 18 known as fertilization, After which a new individual may develop from a fertilized egg.
Sexual reproduction 18 advantageous biologically for it makes possible the recombination of the best. inherited oharacteristics of two parents and provides for the possibility that some of the offspring may.. be better adapted to survive than either parent
was.
III. (a) Explain (1) the origin or anuman embryo,
(11) how it is fed during development, (iii) how it respires, during development. What changes take place in the body of the nother during and after development of the ambryo?
Ans.
(b) Make a comparison or the parental care of a
-manzal, a bird and a frog.
(b) In mammals, they give birth to the wall,
- developed young offspring. During the
embryonic development, embryoss that are to
develop into homoiothermio adults must
apparently have a warm, constant temperature
to develop normally, o mammals cannot produce egge and then ignore them, the fertilized egge are therefore retained within a special region, the uterus, to develop.
Care of the young does not stop at birth, Tor all female mammals have specialized mammary glands which secreta.a" nutrient milk on which the young offspring feed.
.
In birds, they must lay their aggs in nest, or on a suitable place which provided before the deposition of eggs. Daring incubation the mother bird must sit on the eggs to supply fhamouitable temperature for hatching, after birth the young birds are reared by the parents until they can live independently.
In frogs, from the development of the embryo to the formation, of adult frog: is without any parental cares for the hatching D4 688 is affected by the temperature of the edrrounding water and the developing embryo depende upon the yolk of the egg for food". supply.
Questions for this week
I
Write on the line at the right of each statement or question the number preceding the word expression that best completes the statement of answers the question t-
1. An enzyme. which acts on starob is (1) bile
(2) papain (3) ptyalin (4) secratin (5) 11pass
I.
2. The structure through which a mammaliann
embryo is nourished before birth is the (1) ovary (2) placenta (3) atomaok (4) yolk Bac (5) uterus
2.
3. Involuntary musols is found in the (1) fingers
(2) legm (3) stomach (4) toea (5) tongue
3.
4. The tube which carries eggs away from the ovary is the (1) sperm duct (2) ureter (3) urethra (4) epididymis (5) oviduct
5. The secretions of the endocrine glands are
distributed throughout the body by the
Tumph, (2) narvan. (3) muscles (4) blood
5
{2) lumph (2). nerven. (
6. The body oopains mosteof its nitrogen from.
(1) 'fat' (2) sugar (3) starch (4) cellulose (5) protein
6.
7. After digestion or a meal, most absorbed glucose is removed from the blood in the (1) gall bladder (2) laiver (3) stomach (4) pancreas (5) epleen
7.
3. During a weight-reducing diet, some of our
energy comes from the oxidation of the body's stored (1) fat (2) minerale (3) vitamins (4) water (5) protein
(مضرة)
Vertices of polygon
0 (0,0)
A (16,0)
B (8,12)
+ (0,20)
f(x,y) = lix + 95
11.09.00 11.169.0 - 176 11.8.9.12 - 196 11.09.20 - 180
It is the ordered pair (8,12) that yields the greatest value of f(x,y). Therefore he should purchase 8 cows and 12 sheep, in order to get a maximum profit.
4. Exercises for the week.
1) Sketch the graph of each of the following
Aystems.
024
(x > -1
(a)
5x + 4y U
( 3x + y 6 12 (b) 3x-2y7-6
+2 x-2y10
23 ▲ floor manager is going to install two types
of machines," a'small and a large. The table shows the restrioting conditions; The profit 20 a small machine is £3 per week and on a large one is £5. Find the maximum profit in w wook.
Small large
Maximum available
No. of operators Space in sq,yd.
2
3
56
136
(a) (1) Sexual reproduction is characterised by
the development of a new individual from a fertilized egg or zygote, produced in turn by the fusion of two gametes, the oparm and egg. The fertilized egg thea develops into a minute embryo by means of rapid cell divisions. This young ‘ia, slowly `oarried down the oviduct into the uterus
where it ataya and undergoes its embryonic development.
(11) and fiix}
At first the developing embryo obtains ita nourishments by breaking down the mucosa of the uterus with enzymes. After the embryo nas bean attached to the utarina decidur by a placenta. The placenta is therefore the respiratory, nutritive and excretory organ for the embryo. The two umbilical blood vessels (artery and vein) leave the embryo at the navel, and pass through the umbilical cord to
break up into capillaries in the chorionio villi and thus lie in a pool of maternal blood The umbilical vein carries blood, from embryo to the capillaries in the villi, and the umbilical artery carries the blood from the capillaries to the embryo, It must be emphasized that the blood of the mother and that of the embryo are not in direct communio- ation, but are separated by a thin membrane through which oxygen, autrients and other materiale diffuse from the blood of the” mother, to that of the embryo, while nitrogenous wastes and carbon dioxide diffuse from the blood of the embryo to the blood in the maternal tissue..
During pregnanoy the large amount of satrone secreted by the placenta prevents the formation of prolactin. But immediately after the expulsion of the placenta during birth the estrone content of the blood falls to a very low level and thereby allows the secretion of prolactin. After delivery the mammary glands begin to secrete milk.
When birth begins, the uterine wall contracts at regular intervals, These contrao- tions gradually increase in strength and frequency, in the mean time.
the cervix gradually dilates. Finally, the contractions of uterine wall and abdominal muscles will force the foetus passing out through the vagina. After birth the uterus reduces in size and later obtains the same as before
pregnancy.
9. Ciliated cells are important in the hüman
(1) circulatory system (2) digestive system (3) respiratory system (4) skeletal system (5) nervous system
9.
10. The development of giants and dwarfs is most
often due to the defective functioning of the (1) adrenals (2) panoreas (3) pituitary. (4) thyroid (5) pineal
10.
11. The adrenal gland is nearest the (1) brain
(2) kidney (3) liver (4) throat (5) panoraas
1.
ic. The defect called beri-beri 18 que to
(1) insufficient secretion of bile (2) excess Becretion of gastric juice (3) absence of proteins in the diet (4) absence of vitamin E in the diet (5) absence of vitamin B. in the dist
12.
13. which organ in the coay secretes. an alkaline
digestive juice?
(1) stomach (2) pancreas (3) gullet (4) large intestine (5) spleen
13.
14. Which two parts of the body make red blood
corpuscles?
1. Red bone marrow
II. pancreas
III. spleen
IV. Blood-capillaries
V. Liver
(1) I and II (2) II and III (3) III and IV (4) IV and V (5) I and III
14.
15. The enzyme which auva un proteins in the
stomach juice is called (1) ptyalin (2) pepsin (3) trypsin (4) rennan (5) lipase
-15
II. (a) Make a list of Eight named multicellular
organisms (plants and animals) that you have found in any one named habit (or in a balanced aquarium) you have studied, (b) Give a brief illustrated account of the life
history and habits of ONE plant and ONE animal from your list.
III. (a) Make large labelled drawings to show the structure of Mucor and Spriogyra. (b) Show the similarities and differences between
Mucor and Spirogyra with reference to (1) feading. (ii) reproduction.
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