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Plant Growth and Development

AIPMT 2004MCQEasy📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2004

Cell elongation in internodal regions of the green plants takes place due to

  1. indole acetic acid
  2. cytokinins
  3. gibberellins
  4. ethylene.

Answer

(3) gibberellins

Solution

As per NCERT, gibberellins cause an increase in length of axis; they are used to increase the length of grapes stalks.

⇒ Gibberellins promote bolting, i.e., internode elongation just prior to flowering, in beet, cabbages and many plants with rosette habit.

∵ Cytokinins mainly promote cell division, ethylene promotes horizontal growth / senescence, and auxin (IAA) mainly acts on apical growth and rooting.

∴ Cell elongation in the internodal regions is due to gibberellins.

Answer: (3)

Keep practising — Plant Growth and Development

Ques. 2AIPMT 2004

One set of the plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?

  1. Long day
  2. Darkness neutral
  3. Day neutral
  4. Short day
Ques. 3AIPMT 2004

The maximum growth rate occurs in :-

  1. Exponential phase
  2. Stationary phase
  3. Senescent phase
  4. Lag phase
Ques. 4AIPMT 2003

Differentiation of shoot is controlled by

  1. high auxin : cytokinin ratio
  2. high cytokinin : auxin ratio
  3. high gibberellin : auxin ratio
  4. high gibberellin : cytokinin ratio.
Ques. 5AIPMT 2003

Coconut milk factor is

  1. abscisic acid
  2. an auxin
  3. a gibberellin
  4. cytokinin
Ques. 6AIPMT 2002

Which pigment absorbs the red and far-red light?

  1. Cytochrome
  2. Phytochrome
  3. Carotenoids
  4. Chlorophyll
Ques. 7AIPMT 2002

Seed dormancy is due to the

  1. ethylene
  2. abscisic acid
  3. IAA
  4. starch
Ques. 8AIPMT 2002

Dwarfness can be controlled by treating the plant with

  1. cytokinin
  2. gibberellic acid
  3. auxin
  4. antigibberellin
Ques. 9AIPMT 2001

Which plant is LDP?

  1. Tobacco
  2. Glycine max
  3. Mirabilis jalapa
  4. Spinach
Ques. 10AIPMT 2001

Which of the following prevents the fall of fruits?

  1. GA3
  2. NAA
  3. Ethylene
  4. Zeatin
Ques. 11AIPMT 2001

Hormone responsible for senescence is

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

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