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Plant Growth and Development · Question 45

AIPMT 2012 (Mains)MCQEasy📈 Topic in 0% papers+4−1
1

Through their effects on plant growth regulators, what do the temperature and light control in the plants?

  1. Apical dominance
  2. Flowering
  3. Closure of stomata
  4. Fruit elongation

Answer

(2) Flowering

Solution

Light (photoperiod) and temperature (vernalisation) act through plant growth regulators (e.g. florigen, gibberellins) to control the onset of flowering.

⇒ Photoperiodism: flowering depends on the relative length of day and night.

⇒ Vernalisation: flowering is promoted by exposure to low temperature.

Answer: (2)

AIPMT 2012 (Mains)

Keep practising — Plant Growth and Development

2

Which one of the following generally acts as an antagonist to gibberellins?

  1. Zeatin
  2. Ethylene
  3. ABA
  4. IAA
AIPMT 2012 (Mains)
3

Vernalization stimulates flowering in

  1. zamikand
  2. turmeric
  3. carrot
  4. ginger.
AIPMT 2012 (Mains)
4

One of the commonly used plant growth hormones in tea plantations is

  1. ethylene
  2. abscisic acid
  3. zeatin
  4. indole-3-acetic acid
AIPMT 2010 (Mains)
5

Root development is promoted by

  1. abscisic acid
  2. auxin
  3. gibberellin
  4. ethylene
AIPMT 2010 (Mains)
6

Phototropic curvature is the result of uneven distribution of

  1. gibberellin
  2. phytochrome
  3. cytokinins
  4. auxin
AIPMT 2010 (Prelims)
7

Photoperiodism was first characterised in

  1. tobacco
  2. potato
  3. tomato
  4. cotton
AIPMT 2010 (Prelims)
8

Coiling of garden pea tendrils around any support is an example of

  1. thigmotaxis
  2. thigmonasty
  3. thigmotropism
  4. thermotaxis
AIPMT 2010 (Prelims)
9

One of the synthetic auxin is

  1. IAA
  2. GA
  3. IBA
  4. NAA
AIPMT 2009
10

Which one of the following acids is a derivative of carotenoids?

  1. Indole-3-acetic acid
  2. Gibberellic acid
  3. Abscisic acid
  4. Indole butyric acid
AIPMT 2009
11

Importance of day length in flowering of plants was first shown in

  1. cotton
  2. Petunia
  3. Lemna
  4. tobacco
AIPMT 2008

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