食二張六第
日三十月四年申戊麿夏
WAH KIU YAT PO
日九月五年八六九一座公年七十五圍民字
官教備壽
produce new potato tublars,
), while the axillary :
8 英文
英文中學會考試題預習專欄
buds of the compousid leaves develop into ordinary shoots»,'
(d)'
生物科 (廿八)
慶百琴、
Biology(28)
Jabat:
As Lentice2
B. Attachment to parent plans}
C. An "eye" .
De Axillary bud
(b)
B, Scale Teat
Answer to the exércise of last weeki'
1. (a) What do you understand by vegetativas propagation?
ans.
(b) Give a brief account of advantages and dia-
advantages of vegetative propagation.
(a) Vegetative propagation is the development of .
new individual from the mother plant of a vegetative structure, e.g. Food-storage organs, besides providing for perennation of the plant, may also provide for its reproduction, “by developing from one storage organ several new shoots which may then beadme detached from the mother plant and form new individuals.... Thi method of reproduation without producing flowers is celled vegetative propaga tion,
(b) Advantages of vegetative propagation.
And
(1) New plants develop quickly into perfect
replicas of their parents,-
(14) Plentiful food is stored in the reproductive
organ to tide the over the early stages of growth.
(iii) The new individual may be adapted to the
enviratment.
(iv) The process of reproduction is without the
belp of the complicated mohanismID,
Disadvan
or vegetative pronation: (3). Plants are easily to become overcrowded,
thus enough food supply for the plants is ree triotod.
(11) The healthy generations tend to diminish. {111} There is no genetical difference betweJD
the parent and the new individuals and hence the new individuals are less adaptablej to the change in the enviornmenY (iv) Diseases of the parents always become
diseases of the generations automatically,
State the type, food-atorage and method of reproduction in each of the following vegetative reproductive organs illustrated in the sketches and label the parts in each sketch indicated by letters.
(0)
3
Type: Bulb (Tulip)
Food-storage: Carbohydrates Method of Reproduction:
E F
The food-atorage leaves arise from triangular sten. The future leaves and flowers are in the centre of food storing leaves, The annual cycle begins in autum, the stored food being used in the growth of roots, leaves and flowers while the excess:food which is stored in the axillary buds..
A: Food-storage" leaf
B: Senle İsaf:
C: Flower bus?
Di Axillary buď sz-
E: Triangular sten
F: Adventitious fool,
(a)`
Type: Rhizom (Ginger)
Food-a term ge: Carbohydrates
Kethod of Reproduction:
This undergrond stam possesses distanez .
nodes and internodes; adventitious roots, scale
leaves and axillary budo arising from the nodes.
During reprodustion, the rhizome puts up a skrigle leafly, flower bearing aerial shoot Label:
A Scar of old serial stem
B: Terminal bud
C: Scale leni
Di Axillary bud
C: Adventitious root
E
Typet Rummer Catrawberry) Food-atorage: No food stored Method of Reproduction:
The plant has a short ɔnderground stam, Toward the end of the flowering season, the
buds in the axials of leaves grow outward forming long and thin hårisontal steam which possesa á few scale leaves, The terminal bud of the
rummer turns upwards and advantitious roots, parand, thus maicing a new leafly plant.
Label:
A: Terminal bod
B: Leïf stalk
C: Soale- Lenf
Di Adventitious root
Stem tuber (potato)}
Nethod of Reproduction
potate
which develop
Edventitious root in the soil. The aerial pars”
develope and, later in the year, the underground
axillary buds grow into short underground stem
the ends of which receive the sxs959, food the photosynthetie
und to swell to
HOP
ations for thia
Abl
nasia? štete the songaszom®.
would you - prove that
What do you understand by aerobic and asserobis spiration? Compare so far as you can, the
arances between respiration and photosynthesis,
中文列爲官方語言
六各战重的素是要求
,此委員會並應由官。 「方及非實力的人士組第一〇五集案
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應設調查委員會
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有信心,黃意邙若出幼院,也由本年度就
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及大青堂售票选代養,門療定出世啦在
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大英大彩七
快選天冷
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雄味香色
也無這!爛個男!」
1開番 打個女
□侠情龍游。
鐵虎條
格鬥戰