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Plant Growth and Development · Question 32

NEET 2017MCQEasy📈 Topic in 50% papers+4−1
1

Fruit and leaf drop at early stages can be prevented by the application of

  1. ethylene
  2. auxins
  3. gibberellic acid
  4. cytokinins.

Answer

(2) auxins

Solution

As per NCERT, auxins help to prevent fruit and leaf drop at early stages but promote the abscission of older, mature leaves and fruits.

Ethylene, on the other hand, promotes abscission.

Answer: (2)

NEET 2017

Keep practising — Plant Growth and Development

2

The Avena curvature is used for bioassay of

  1. IAA
  2. ethylene
  3. ABA
  4. GA3.
NEET 2016 (Phase 1)
3

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

  1. IAA and gibberellin
  2. Auxin and cytokinin
  3. Auxin and abscisic acid
  4. Gibberellin and abscisic acid
NEET 2016 (Phase 2)
4

Phytochrome is a

  1. flavoprotein
  2. glycoprotein
  3. lipoprotein
  4. chromoprotein
NEET 2016 (Phase 2)
5

Auxin can be bioassayed by

  1. potometer
  2. lettuce hypocotyl elongation
  3. Avena coleoptile curvature
  4. hydroponics.
AIPMT 2015
6

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.
AIPMT 2015 (Cancelled)
7

Typical growth curve in plants is

  1. stair-steps shaped
  2. parabolic
  3. sigmoid
  4. linear.
AIPMT 2015 (Cancelled)
8

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
9

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
10

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
11

During seed germination its stored food is mobilized by

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

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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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