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Plant Growth and Development · Question 48

AIPMT 2010 (Mains)MCQMedium📈 Topic in 50% papers+4−1
1

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

  1. ethylene
  2. abscisic acid
  3. zeatin
  4. indole-3-acetic acid

Answer

(4) indole-3-acetic acid

Solution

Indole-3-acetic acid (IAA) is a natural auxin.

As per NCERT, auxins help to initiate rooting in stem cuttings, which is widely used for plant propagation, and auxins control apical dominance; removal of shoot tips (decapitation), which removes the auxin-producing apex and makes lateral buds grow, is widely applied in tea plantations and hedge-making.

∴ The plant hormone commonly used in tea plantations is indole-3-acetic acid.

Answer: (4)

AIPMT 2010 (Mains)

Keep practising — Plant Growth and Development

2

Root development is promoted by

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

Phototropic curvature is the result of uneven distribution of

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

Photoperiodism was first characterised in

  1. tobacco
  2. potato
  3. tomato
  4. cotton
AIPMT 2010 (Prelims)
5

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

  1. thigmotaxis
  2. thigmonasty
  3. thigmotropism
  4. thermotaxis
AIPMT 2010 (Prelims)
6

One of the synthetic auxin is

  1. IAA
  2. GA
  3. IBA
  4. NAA
AIPMT 2009
7

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
8

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

  1. cotton
  2. Petunia
  3. Lemna
  4. tobacco
AIPMT 2008
9

Senescence as an active developmental cellular process in growth and functioning of a flowering plant, is indicated in

  1. annual plants
  2. floral parts
  3. vessels and tracheid differentiation
  4. leaf abscission
AIPMT 2008
10

The wavelength of light absorbed by Pr form of phytochrome is

  1. 680 nm
  2. 720 nm
  3. 620 nm
  4. 640 nm
AIPMT 2007
11

Which one of the following pairs, is not correctly matched?

  1. Gibberellic acid - Leaf fall
  2. Cytokinin - Cell division
  3. IAA - Cell wall elongation
  4. Abscisic acid - Stomatal closure
AIPMT 2007

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