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Plant Growth and Development · Question 73

AIPMT 2002MCQEasy📈 Topic in 75% papers+4−1
1

Dwarfness can be controlled by treating the plant with

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

Answer

(2) gibberellic acid

Solution

As per NCERT, gibberellins cause an increase in length of axis (internodal elongation); they are used to increase the length of grape stalks and of sugarcane stems.

∵ Genetically dwarf plants (e.g., dwarf pea, dwarf maize) lack enough gibberellin, applying gibberellic acid (GA3) makes them grow to normal height.

∴ Dwarfness is controlled by gibberellic acid.

Answer: (2)

AIPMT 2002

Keep practising — Plant Growth and Development

2

Which plant is LDP?

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

Which of the following prevents the fall of fruits?

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

Hormone responsible for senescence is

  1. ABA
  2. auxin
  3. GA
  4. cytokinin
AIPMT 2001
5

Which hormone breaks dormancy of potato tuber?

  1. Gibberellin
  2. IAA
  3. ABA
  4. Zeatin
AIPMT 2001
6

Proteinaceous pigment which controls the activities concerned with light is

  1. Carotenoids
  2. Phytochrome
  3. Chlorophyll
  4. Anthocyanin
AIPMT 2001
7

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
8

By which action a seed coat becomes permeable to water?

  1. scarification
  2. stratification
  3. vernalization
  4. all of the above
AIPMT 2000
9

Which hormone is responsible for fruit ripening?

  1. Ethylene
  2. Auxin
  3. Ethyl chloride
  4. Cytokinin
AIPMT 2000
10

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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