PYQSide ExamsMy practice

Plant Growth and Development · Question 19

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

The gaseous plant growth regulator is used in plants to:

  1. speed up the malting process
  2. promote root growth and root hair formation to increase the absorption surface
  3. help overcome apical dominance
  4. kill dicotyledonous weeds in the fields

Answer

(2) promote root growth and root hair formation to increase the absorption surface

Solution

The gaseous plant growth regulator is ethylene.

As per NCERT, ethylene promotes root growth and root hair formation, thus helping plants to increase their absorption surface.

Speeding up malting – gibberellins; overcoming apical dominance – cytokinins; killing dicot weeds – auxin (2,4-D).

Answer: (2)

NEET (UG) 2022

Keep practising — Plant Growth and Development

2

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:

  1. ABA
  2. Gibberellin
  3. Ethylene
  4. Cytokinin
NEET (UG) 2022
3

The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called

  1. Differentiation
  2. Redifferentiation
  3. Development
  4. Plasticity
NEET (UG) 2022 (Phase 2)
4

Which of the following growth regulators is an adenine derivative?

  1. Abscisic acid
  2. Auxin
  3. Cytokinin
  4. Ethylene
NEET (UG) 2022 (Phase 2)
5

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
NEET (UG) 2022 (Phase 2)
6

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
7

The site of perception of light in plants during photoperiodism is

  1. Leaf
  2. Shoot apex
  3. Stem
  4. Axillary bud
NEET (UG) 2021
8

The plant hormone used to destroy weeds in a field

  1. IBA
  2. IAA
  3. NAA
  4. 2, 4-D
NEET (UG) 2021
9

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
10

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
11

The process of growth is maximum during

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

All Plant Growth and Development PYQs →

PDFDownload Plant Growth and Development PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
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)