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► Biology (NEET) > XI: Chapter 15- Plant growth and development > Flashcards

XI: Chapter 15- Plant growth and development Flashcards

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1
Q

Who developed arc auxanometre?

A

Pfeffer

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2
Q

Which device is used to measure the increase in surface area?

A

Crescograph

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3
Q

What is the term ‘r’ in the equation of geometric growth?

A

r= relative growth rate, efficiency index

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4
Q

Which phase represents the phase of adaptation in a sigmoid curve?

A

Lag phase

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5
Q

Developmental heterophylly is found in

A

Cotton, larksur, corriander

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6
Q

Environmental heterophylly is found in

A

Buttercup

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7
Q

Who discovered auxin?

A

Darwin

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8
Q

In which plant was auxin first discovered?

A

Canary

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9
Q

Who isolated auxin from a plant for the first time?

A

F.W. Went isolated auxin for the first time from the coleoptile tip of oat (Avena sativa)

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10
Q

Auxin was first exctracted from

A

Human urine

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11
Q

What is the bioassay of auxins?

A

Avena curvature test

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12
Q

What is the natural form of auxin?

A

IAA, IBA

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13
Q

Name three synthetic auxin.

A

Naphthalene acetic acid
2,4-D
2,4,5,-T

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14
Q

Which hormone initiates rooting in stems?

A

Auxin

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15
Q

Which hormones promote flowering in pineapples?

A

Auxin and ethylene

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16
Q

Which hormone prevents leaf and fruit drop at early stages but promotes abscission of older leaves, flowers, etc?

A

Auxin

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17
Q

Which hormone induces apical dominance?

A

Auxin

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18
Q

Whicch hormone induces parthenocarpy?

A

Auxin

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19
Q

Mixture of which hormones is used as a dicot weedicide?

A

2,4-D and 2,4,5-T

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20
Q

What is the bioassay of gibberellins?

A

Dwarf pea test

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21
Q

Which hormones induce profuse flowering in plants?

A

Gibberellins

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22
Q

Which hormoes delay senescence?

A

Gibberellins and cytokinins

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23
Q

Which hormones are used to increase the length of the stalk of grape vines?

A

Gibberellins

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24
Q

Which hormones cause fruits like apple to elongate?

A

Gibberellins

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25
Q

Which is the most important gibberellin?

A

GA3

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26
Q

Which hormones are used to increase malting in plants?

A

Gibberellins

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27
Q

Which hormones are extremely useful to the brewing industry?

A

Gibberellins

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28
Q

Which hormones cause bolting?

A

Gibberellins

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29
Q

By how many times do gibberellins increase the yield of sugarcane?

A

20 times

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30
Q

Who discovered cytokinins and in what?

A

Miller and skoog discovered cytokinins in sperms of herring.

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31
Q

Cytokinins were discovered in which plant for the first time?

A

Endosperm of maize

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32
Q

What did Miller and Skoog name cytokinins?

A

Kinetin

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33
Q

What did Letham who discovered cytokinins in maize name it?

A

Zeatin

34
Q

What is the bioassay of cytokinins?

A

Retention of chlorophyll

35
Q

Which hormones are known as true cell division factors?

A

Cytokinins

36
Q

Which hormones help in overcoming apical dominance?

A

Cytokinins

37
Q

Which hormones are antagonistic to cytokinins?

A

Auxins

38
Q

Give an example of a synthetic cytokinin.

A

BAP (Benzyl amino purine)

39
Q

Who confirmed the presence of ethylene hormones in ripened oranges?

A

Cousins

40
Q

What kind of tissues produce ethylene in maximum quantity?

A

Tissues undergoing senescence

41
Q

Which hormone promotes root hair formation in plants?

A

Ethylene

42
Q

Which hormone is used to initiate fruiting in pineapples?

A

Ethylene

43
Q

Which hormone initiates flowering in mangoes?

A

Ethylene

44
Q

Which hormone induces formation of female flowers in cucumbers?

A

Ethylene

45
Q

Which hormone promotes horizontal growth of seedlings and apical hook formation?

A

Ethylene`

46
Q

Which hormone promotes rapid petiole elongation in rice?

A

Ethylene

47
Q

WHich hormone helps break bud and seed dormancy?

A

Ethylene

48
Q

Which hormone initiates germination in peanuts?

A

Ethylene

49
Q

Which hormone helps in sprouting of potato tubers?

A

Ethylene

50
Q

What is respiratory climactic?

A

Increased rate of respiration during ripening of fruits

51
Q

Which is the most common source of ethylene ?

A

Ethaphon

52
Q

Which hormone is called stress hormone?

A

Abscissic acid

53
Q

Which hormones are antagonistic to gibberellic acid?

A

Abscissic acid

54
Q

What is known as critical day length?

A

The length of day or light period in a 24-hour cycle required to induce flowering of long-day plants or to inhibit flowering of short-day plants.

55
Q

Give examples of short day plants.

A

Sorghum, strawberry, rice, tobacco, chrysanthemum, soyabean

56
Q

Give examples of long day plants.

A

Oats, wheat, potato, spinach radish, sugarbeet

57
Q

Give examples of day neutral plants.

A

Tomato, rose, sunflower, cotton

58
Q

When are winter varieties of a plant planted?

A

Autumn

59
Q

When are winter varietes of a plant harvested?

A

Mid-summer

60
Q

Which hormone substitutes for low temperatures required for vernalisation?

A

Gibberellic acid

61
Q

What is the colour of phytochrome red?

A

Bluish

62
Q

What is the colour of phytochrome far red?

A

Yellow green

63
Q

Where is phytochrome red located?

A

On cell membrane

64
Q

Where is phytochrome far red located?

A

Cytoplasm

65
Q

Phytochrome red can be converted into phytochrome far red by

A

red light

66
Q

Phytochrome far red can be converted into phytochrome red by

A

Far red light

67
Q

Flowering in short day plants in induced by which phytochrome?

A

Phytochrome red

68
Q

Flowering in long day plants is induced by which phytochrome?

A

Phytochrome far red

69
Q

N6-furfurylamino purine is a derivative of

A

Adenine

70
Q

Kinetin is a derivative of

A

Adenine

71
Q

Abscissic acid is a derivative of

A

Carotenoids

72
Q

Gibberellic acid is a derivative of

A

Terpenes

73
Q

Though ethylene can function as both a plant growth promoter and a plant growth inhibitor, it is a largely a

A

Plant growth inhibitor

74
Q

Which hormone helps control xylem differentiation?

A

Auxin

75
Q

Which hormones allow fruits to be left longer on the trees so as to extend its market period?

A

Giberellic acids

76
Q

Which hormone hastens the maturity of juvenile conifers?

A

Giberellic acids

77
Q

Which hormone promotes adventitious root formation?

A

Cytokinins

78
Q

Which hormone accelerates thinning of cotton, cherry and walnut?

A

Ethylene

79
Q

What are the sites of perception of light/dark duration?

A

Leaves

80
Q

Biennials are polycarpic plants that normallly flower and die in the second season. True/false?

A

False. They are monocarpic.

81
Q

Give examples of common biennials?

A

Sugarbeet, cabbages, carrots

► Biology (NEET) (39 decks)

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