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Plant Growth and Development · Question 76

AIPMT 2001MCQEasy📈 Topic in 38% papers+4−1
1

Hormone responsible for senescence is

  1. ABA
  2. auxin
  3. GA
  4. cytokinin

Answer

(1) ABA

Solution

As per NCERT, abscisic acid (ABA) is a general plant growth inhibitor; it inhibits seed germination, induces dormancy and stimulates closure of stomata.

⇒ ABA promotes senescence and abscission of leaves, whereas cytokinins delay leaf senescence.

∴ ABA is the hormone responsible for senescence.

Answer: (1)

AIPMT 2001

Keep practising — Plant Growth and Development

2

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin
AIPMT 2001
3

Proteinaceous pigment which controls the activities concerned with light is

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

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
5

By which action a seed coat becomes permeable to water?

  1. scarification
  2. stratification
  3. vernalization
  4. all of the above
AIPMT 2000
6

Which hormone is responsible for fruit ripening?

  1. Ethylene
  2. Auxin
  3. Ethyl chloride
  4. Cytokinin
AIPMT 2000
7

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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