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Biology NEET 2023 > XI: Chapter 15- Plant growth and development > Flashcards

XI: Chapter 15- Plant growth and development Flashcards

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
Which is the most important gibberellin?
GA3
26
Which hormones are used to increase malting in plants?
Gibberellins
27
Which hormones are extremely useful to the brewing industry?
Gibberellins
28
Which hormones cause bolting?
Gibberellins
29
By how many times do gibberellins increase the yield of sugarcane?
20 times
30
Who discovered cytokinins and in what?
Miller and skoog discovered cytokinins in sperms of herring.
31
Cytokinins were discovered in which plant for the first time?
Endosperm of maize
32
What did Miller and Skoog name cytokinins?
Kinetin
33
What did Letham who discovered cytokinins in maize name it?
Zeatin
34
What is the bioassay of cytokinins?
Retention of chlorophyll
35
Which hormones are known as true cell division factors?
Cytokinins
36
Which hormones help in overcoming apical dominance?
Cytokinins
37
Which hormones are antagonistic to cytokinins?
Auxins
38
Give an example of a synthetic cytokinin.
BAP (Benzyl amino purine)
39
Who confirmed the presence of ethylene hormones in ripened oranges?
Cousins
40
What kind of tissues produce ethylene in maximum quantity?
Tissues undergoing senescence
41
Which hormone promotes root hair formation in plants?
Ethylene
42
Which hormone is used to initiate fruiting in pineapples?
Ethylene
43
Which hormone initiates flowering in mangoes?
Ethylene
44
Which hormone induces formation of female flowers in cucumbers?
Ethylene
45
Which hormone promotes horizontal growth of seedlings and apical hook formation?
Ethylene`
46
Which hormone promotes rapid petiole elongation in rice?
Ethylene
47
WHich hormone helps break bud and seed dormancy?
Ethylene
48
Which hormone initiates germination in peanuts?
Ethylene
49
Which hormone helps in sprouting of potato tubers?
Ethylene
50
What is respiratory climactic?
Increased rate of respiration during ripening of fruits
51
Which is the most common source of ethylene ?
Ethaphon
52
Which hormone is called stress hormone?
Abscissic acid
53
Which hormones are antagonistic to gibberellic acid?
Abscissic acid
54
What is known as critical day length?
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
Give examples of short day plants.
Sorghum, strawberry, rice, tobacco, chrysanthemum, soyabean
56
Give examples of long day plants.
Oats, wheat, potato, spinach radish, sugarbeet
57
Give examples of day neutral plants.
Tomato, rose, sunflower, cotton
58
When are winter varieties of a plant planted?
Autumn
59
When are winter varietes of a plant harvested?
Mid-summer
60
Which hormone substitutes for low temperatures required for vernalisation?
Gibberellic acid
61
What is the colour of phytochrome red?
Bluish
62
What is the colour of phytochrome far red?
Yellow green
63
Where is phytochrome red located?
On cell membrane
64
Where is phytochrome far red located?
Cytoplasm
65
Phytochrome red can be converted into phytochrome far red by
red light
66
Phytochrome far red can be converted into phytochrome red by
Far red light
67
Flowering in short day plants in induced by which phytochrome?
Phytochrome red
68
Flowering in long day plants is induced by which phytochrome?
Phytochrome far red
69
N6-furfurylamino purine is a derivative of
Adenine
70
Kinetin is a derivative of
Adenine
71
Abscissic acid is a derivative of
Carotenoids
72
Gibberellic acid is a derivative of
Terpenes
73
Though ethylene can function as both a plant growth promoter and a plant growth inhibitor, it is a largely a
Plant growth inhibitor
74
Which hormone helps control xylem differentiation?
Auxin
75
Which hormones allow fruits to be left longer on the trees so as to extend its market period?
Giberellic acids
76
Which hormone hastens the maturity of juvenile conifers?
Giberellic acids
77
Which hormone promotes adventitious root formation?
Cytokinins
78
Which hormone accelerates thinning of cotton, cherry and walnut?
Ethylene
79
What are the sites of perception of light/dark duration?
Leaves
80
Biennials are polycarpic plants that normallly flower and die in the second season. True/false?
False. They are monocarpic.
81
Give examples of common biennials?
Sugarbeet, cabbages, carrots

Biology NEET 2023 (39 decks)

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