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Plant Growth and Development · Question 42

NEET 2013MCQEasy📈 Topic in 75% papers+4−1
1

During seed germination its stored food is mobilized by

  1. ABA
  2. gibberellin
  3. ethylene
  4. cytokinin.

Answer

(2) gibberellin

Solution

As per NCERT, gibberellins promote seed germination and are used to speed up the malting process in brewing.

⇒ In germinating cereal grains, gibberellin from the embryo induces the aleurone layer to synthesise hydrolytic enzymes such as -amylase.

⇒ These enzymes hydrolyse starch and other reserves of the endosperm into soluble sugars, which the growing embryo uses.

∵ ABA inhibits seed germination (promotes dormancy), ethylene and cytokinin have no such role.

∴ Stored food is mobilised by gibberellin.

Answer: (2)

NEET 2013

Keep practising — Plant Growth and Development

2

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

  1. NAA, 2,4-D
  2. Phenyl acetic acid
  3. Cytokinin
  4. IAA, IBA.
NEET 2013 (Karnataka)
3

Which of the following best illustrates "FEEDBACK" in development ?

  1. As tissue (X) develops, it secretes something that induces tissue (Y) to develop
  2. As tissue (X) develops, it secretes something that slows down the growth of tissue (Y)
  3. Tissue (X) secretes RNA which changes the development of tissue (Y)
  4. As tissue (X) develops, it secretes enzymes that inhibit the development of tissue (Y)
NEET 2013 (Karnataka)
4

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
AIPMT 2012 (Mains)
5

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

  1. Zeatin
  2. Ethylene
  3. ABA
  4. IAA
AIPMT 2012 (Mains)
6

Vernalization stimulates flowering in

  1. zamikand
  2. turmeric
  3. carrot
  4. ginger.
AIPMT 2012 (Mains)
7

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)
8

Root development is promoted by

  1. abscisic acid
  2. auxin
  3. gibberellin
  4. ethylene
AIPMT 2010 (Mains)
9

Phototropic curvature is the result of uneven distribution of

  1. gibberellin
  2. phytochrome
  3. cytokinins
  4. auxin
AIPMT 2010 (Prelims)
10

Photoperiodism was first characterised in

  1. tobacco
  2. potato
  3. tomato
  4. cotton
AIPMT 2010 (Prelims)
11

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

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

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
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