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Plant Growth and Development · Question 23

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 38% papers+4−1
1

The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as

  1. Secondary growth
  2. Differentiation
  3. Dedifferentiation
  4. Redifferentiation

Answer

(3) Dedifferentiation

Solution

As per NCERT, living differentiated cells that have lost the capacity to divide can regain it under certain conditions; this is called dedifferentiation, e.g. formation of interfascicular cambium and cork cambium from fully differentiated parenchyma cells.

In plant tissue culture, non-dividing parenchyma cells of the explant start dividing mitotically to form a callus – dedifferentiation.

Answer: (3)

NEET (UG) 2022 (Phase 2)

Keep practising — Plant Growth and Development

2

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called

  1. Maturity
  2. Elasticity
  3. Flexibility
  4. Plasticity
NEET (UG) 2021
3

The site of perception of light in plants during photoperiodism is

  1. Leaf
  2. Shoot apex
  3. Stem
  4. Axillary bud
NEET (UG) 2021
4

The plant hormone used to destroy weeds in a field

  1. IBA
  2. IAA
  3. NAA
  4. 2, 4-D
NEET (UG) 2021
5

Which of the following is not an inhibitory substance governing seed dormancy?

  1. Para-ascorbic acid
  2. Abscisic acid
  3. Gibberellic acid
  4. Phenolic acid
NEET (UG) 2020
6

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop

  1. Abscisic acid
  2. Cytokinin
  3. Gibberellin
  4. Ethylene
NEET (UG) 2020
7

The process of growth is maximum during

  1. Log phase
  2. Lag phase
  3. Dormancy
  4. Senescence
NEET (UG) 2020
8

What is the site of perception of photoperiod necessary for induction of flowering in plants?

  1. Shoot apex
  2. Leaves
  3. Lateral buds
  4. Pulvinus
NEET (UG) 2019
9

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield?

  1. Gibberellin and Abscisic acid
  2. Cytokinin and Abscisic acid
  3. Auxin and Ethylene
  4. Gibberellin and Cytokinin
NEET (UG) 2019
10

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

  1. ethylene
  2. auxins
  3. gibberellic acid
  4. cytokinins.
NEET 2017
11

The Avena curvature is used for bioassay of

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

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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
Other chaptersBiomolecules (Biology)