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Plant Growth and Development · Question 37

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 50% papers+4−1
1

What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?

  1. Light stimulates plant cells on the lighted side to grow faster.
  2. Auxin accumulates on the shaded side, stimulating greater cell elongation there.
  3. Green plants need light to perform photosynthesis.
  4. Green plants seek light because they are phototropic.

Answer

(2) Auxin accumulates on the shaded side, stimulating greater cell elongation there.

Solution

Unilateral light causes auxin produced at the shoot tip to move towards the shaded side.

⇒ Auxin accumulates on the shaded side and stimulates greater cell elongation there.

∴ The shaded side grows faster than the lighted side, and the shoot bends towards the light (phototropism); as per NCERT, auxin was first isolated from the tips of coleoptiles of oat seedlings in such phototropism experiments.

Answer: (2)

AIPMT 2015 (Cancelled)

Keep practising — Plant Growth and Development

2

Typical growth curve in plants is

  1. stair-steps shaped
  2. parabolic
  3. sigmoid
  4. linear.
AIPMT 2015 (Cancelled)
3

Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment?

  1. It made possible the isolation and exact identification of auxin.
  2. It is the basis for quantitative determination of small amounts of growth-promoting substances.
  3. It supports the hypothesis that IAA is auxin.
  4. It demonstrated polar movement of auxins.
AIPMT 2014
4

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them?

  1. Mutated
  2. Embolised
  3. Etiolated
  4. Defoliated
AIPMT 2014
5

Which one of the following growth regulators is known as 'stress hormone'?

  1. Abscisic acid
  2. Ethylene
  3. GA3
  4. Indole acetic acid
AIPMT 2014
6

During seed germination its stored food is mobilized by

  1. ABA
  2. gibberellin
  3. ethylene
  4. cytokinin.
NEET 2013
7

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)
8

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)
9

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)
10

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

  1. Zeatin
  2. Ethylene
  3. ABA
  4. IAA
AIPMT 2012 (Mains)
11

Vernalization stimulates flowering in

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

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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
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
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