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plant growth and devlopment > plant growth regulators > Flashcards

plant growth regulators Flashcards

1
Q

auxin was isolated from

A

human urine

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2
Q

auxin are produced by

A

growing apices of stems and roots

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3
Q

term auxin is applied to

A

indole 3 acetic acid

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4
Q

IAA,NAA,2 4 D,IBO
classify them as natural and synthetic auxin

A

indole acetic acid and indole butric acid are natural acids
napahthelene acetic acid and 24 dicholorphemoxyacetic acid

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5
Q
A
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6
Q

auxin initiate what

A

rooting in stems cutting

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7
Q

auxin promote

A

flowering in pineapple

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8
Q

auxin prevent _____but promote____

A

fruit and leaf drop at early stages
abscission of older mature leaves and fruits

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9
Q

apical dominace

A

growin apical bud inhibits growth of lateral buds

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10
Q

decapitaion

A

removal of shoot tips

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11
Q

decapitation results in what

A

growth of lateral buds

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12
Q

auxin’s widely used in

A

tea plantation
hedge making

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13
Q

parthenocary induced by

A

auixn in tomatoes

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14
Q

used as herbicides?

A

auxin

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15
Q

2,4D used to kill which weeds?

A

dicotlydenous weeds dont affect mature monocots

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16
Q

the last 3 functions of auxin

A

prepare weed free lawn by gardeners
controls xylem diffrentiation
helps cell division

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17
Q

is absisic acid plant growth promoter or inhibitor

A

inhibitor.
it inhibitor of plant metabolism

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18
Q

ABA inhibits

A

seed germination

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19
Q

abscisic acid was discovered for its role in regulating

A

abscission and dormancy

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20
Q

ABA stimulates

A

closure of stomata and increase tolerance of plants to various kind of stress

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21
Q

ABA plays imp role in which three categories

A

seed devlopment
dormancy
maturation

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22
Q

why does it induce dormancy

A

aba helps seed to withstand dessication and other factores unfavorable for growth

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23
Q

aba acts antagonist to

A

GA

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24
Q

the gaseous pgr is

A

ethylene

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25
Q

ethyelene is synthesised largely by

A

tissues undergoing
sensecnece and ripening

26
Q

state the triple response effect

A

1)horizontal growth of seedling
2)swelling of axis
3)apical hook formation in DICOT seedling

27
Q

ethylene is highly effective in

A

fruit ripening

28
Q

ethylene promotes

A

senescence and absicison

29
Q

respiratory climatic

A

the rise in rate of respiration
ethylene enhances respiration rate during fruit ripening

30
Q

ethyelene promotes rapid what

A

internode and node elongation
petiole elonagation in deep water rice plants

31
Q

which pgr is used for:
to initiate flowering
to promote flowering

A

a)ethylene
b)auxin

32
Q

ethylene initaiates flowering in which 2 fruits

A

mango and pinapple

33
Q

how many gibberlin are reported

A

more than 100

34
Q

how were cytokinin discovered

A

kinetin from autoclaved herring of sperm dna

35
Q

the most widely used pgr in agriculture is

A

eythelen

35
Q

the most widely used compound as source of ethyelen is

A

ethepon

36
Q

widely used ga

A

GA3

37
Q

pgr used in elonagtion of food and to improve its shape

A

gibberelin

38
Q

ethepon helps in

A

fruit ripening tomatoes and apples
accelerates abscission in flowers and fruits (thining of cotton cherry walnut)

39
Q

ethylene initaies seed germination in

A

peanut seeds
sprouting of potato tuber

40
Q

all gs are
acidic
basic

A

acidic

41
Q

the ability to cause increase in grape stalks

A

gibberelins

41
Q

bolting is and shown by

A

internode elongation prior to seed production
ga

42
Q

which pgr breaks seed and bud dormancy

A

ethyelene

43
Q

feminising effect in cucumber

A

ethylene

44
Q

which pgr delay sensence
so that they can be left on tree for longer time

A

gibberlin

45
Q

what is ethepon

A

ethepon is an aqueous solution readily absorbed and transported within plants and released slowly

46
Q

sugarcane stores carbohydrates as sugar where

A

stem

47
Q

ga produce bolting in?

A

beet cabage many plants with rossete habbitat

48
Q

does kinetin occur naturally in plants

A

oh no hehe

49
Q

which pfr used to speed up malting process in brewing industry

A

gibberlein

50
Q
A
51
Q

whihc pgr is supposeed to be used to hasten maturity period
leading to early seed production

A

GA

52
Q
A
53
Q
A
54
Q
A
55
Q
A
56
Q
A
57
Q
A
58
Q
A
59
Q
A

plant growth and devlopment (1 decks)

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