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Plant Growth and Development · Question 72

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
1

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch

Answer

(2) abscisic acid

Solution

As per NCERT, abscisic acid (ABA) inhibits seed germination and plays an important role in seed development, maturation and dormancy.

∵ By inducing dormancy, ABA helps seeds to withstand desiccation and other unfavourable factors,

∴ seed dormancy is due to abscisic acid.

Answer: (2)

AIPMT 2002

Keep practising — Plant Growth and Development

2

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
AIPMT 2002
3

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
AIPMT 2001
4

Which of the following prevents the fall of fruits?

  1. GA3
  2. NAA
  3. Ethylene
  4. Zeatin
AIPMT 2001
5

Hormone responsible for senescence is

  1. ABA
  2. auxin
  3. GA
  4. cytokinin
AIPMT 2001
6

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin
AIPMT 2001
7

Proteinaceous pigment which controls the activities concerned with light is

  1. Carotenoids
  2. Phytochrome
  3. Chlorophyll
  4. Anthocyanin
AIPMT 2001
8

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
9

By which action a seed coat becomes permeable to water?

  1. scarification
  2. stratification
  3. vernalization
  4. all of the above
AIPMT 2000
10

Which hormone is responsible for fruit ripening?

  1. Ethylene
  2. Auxin
  3. Ethyl chloride
  4. Cytokinin
AIPMT 2000
11

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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