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Plant Growth and Development · Question 77

AIPMT 2001MCQEasy📈 Topic in 75% papers+4−1
1

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin

Answer

(1) Gibberellin

Solution

Dormancy of buds and seeds is induced by ABA, an inhibitor; it is broken by promoters of growth.

⇒ Gibberellins counteract ABA and are applied to break the dormancy of potato tubers so that the 'eyes' (buds) sprout.

∵ IAA maintains apical dominance and ABA induces dormancy,

∴ gibberellin breaks the dormancy of potato tuber.

Answer: (1)

AIPMT 2001

Keep practising — Plant Growth and Development

2

Proteinaceous pigment which controls the activities concerned with light is

  1. Carotenoids
  2. Phytochrome
  3. Chlorophyll
  4. Anthocyanin
AIPMT 2001
3

If the apical bud has been removed then we observe

  1. more lateral branches
  2. more axillary buds
  3. plant growing stops
  4. flowering stops
AIPMT 2000
4

By which action a seed coat becomes permeable to water?

  1. scarification
  2. stratification
  3. vernalization
  4. all of the above
AIPMT 2000
5

Which hormone is responsible for fruit ripening?

  1. Ethylene
  2. Auxin
  3. Ethyl chloride
  4. Cytokinin
AIPMT 2000
6

Coconut milk is used in tissue culture because it contains

  1. Auxin
  2. Gibberellin
  3. Ethylene
  4. Cytokinin
Out of syllabusAIPMT 2000

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