Class XI · Biology practice
Plant Growth and Development PYQs Check your understanding, bookmark questions and revisit your mistakes.
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22 questions in this collection · Page 2 of 3
Plant Growth And Development
A species which was introduced for ornamentation but has become a trouble-some weed in India:
A Parthenium hysterophorus B Eichhornia crassipes C Prosopis juliflora D Trapa spinosa
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Plant Growth And Development
Which of the following is not an inhibitory
substance governing seed dormancy?
A Gibberellic acid B Abscisic acid C Phenolic acid D Para-ascorbic acid
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Plant Growth And Development
The process of growth is maximum during:
A Log phase B Lag phase C Senescence D Dormancy
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Plant Growth And Development
Name the plant growth regulator which upon
spraying on sugarcane crop, increases the length
of stem, thus increasing the yield of sugarcane
crop.
A Cytokinin B Gibberellin C Ethylene D Abscisic acid
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Plant Growth And Development
It takes very long time for pineapple plants to
produce flowers. Which combination of hormones
can be applied to artificially induce flowering in
pineapple plants throughout the year to increase
yield?
A Gibberellin and Cytokinin B Gibberellin and Abscisic acid C Cytokinin and Abscisic acid D Auxin and Ethylene
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Plant Growth And Development
What is the site of perception of photoperiod
necessary for induction of flowering in plants:
A Lateral buds B Pulvinus C Leaves D Shoot apex
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Plant Growth And Development
Formation of interfascicular cambium from fully developed parenchyma cells is an example for:
A Redifferentiation B Differentiation C Maturation D Dedifferentiation
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Explanation: NCERT Page no. 245
Plant Growth And Development
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:
A promotes abscission of mature leaves only. B promotes apical dominance. C can help in cell division in grasses, to produce growth.
D does not affect mature monocotyledonous plants.
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Explanation: NCERT Page No.176, (Topic-13.4.3.1 Auxins)
Plant Growth And Development
Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield?
A Gibberellin B Auxin C Abscisic acid D Cytokinin
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Explanation: NCERT Page No.176, (Topic-13.4.3.2 13.4.3.2 Gibberellins)
Plant Growth And Development
Which of the following plant growth regulators is used as herbicide?
A 2,4-D B Kinetin C Abscisic acid D Gibberellin
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2,4-D is a synthetic auxin widely used as a selective herbicide for controlling broad-leaved weeds.
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