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Ecosystem · Question 15

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following will accelerate phosphorus cycle?

  1. Burning of fossil fuels
  2. Volcanic activity
  3. Weathering of rocks
  4. Rainfall and storms

Answer

(3) Weathering of rocks

Solution

As per NCERT, the natural reservoir of phosphorus is rock, which contains phosphorus in the form of phosphates.

When rocks are weathered, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of plants.

∴ Weathering of rocks increases the input of phosphorus into the cycle and accelerates it. (Burning of fossil fuels and volcanic activity affect the carbon cycle; the phosphorus cycle has no significant gaseous exchange.)

Answer: (3)

NEET (UG) 2022

Keep practising — Ecosystem

2

Detritivores breakdown detritus into smaller particles. This process is called :

  1. Catabolism
  2. Fragmentation
  3. Humification
  4. Decomposition
NEET (UG) 2022
3

All successions irrespective of the habitat proceed to which type of climax community?

  1. Edaphic
  2. Xeric
  3. Mesic
  4. Hydrophytic
NEET (UG) 2022 (Phase 2)
4

The pioneer species in a hydrarch succession are

  1. Filamentous algae
  2. Free-floating angiosperms
  3. Submerged rooted plants
  4. Phytoplanktons
NEET (UG) 2022 (Phase 2)
5

The species that come to appear in bare area are called

  1. Species of seral community
  2. Pioneer species
  3. Invasive species
  4. Competitive species
NEET (UG) 2022 (Phase 2)
6

Match List - I with List - II : Choose the correct answer from the options given below:

  1. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  2. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
  3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  4. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
NEET (UG) 2022 (Phase 2)
7

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called

  1. Net primary production
  2. Secondary production
  3. Primary production
  4. Gross primary production
NEET (UG) 2022 (Phase 2)
8

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred to as :

  1. Standing crop
  2. Climax
  3. Climax community
  4. Standing state
NEET (UG) 2021
9

Which of the following statements is not correct?

  1. Pyramid of numbers in a grassland ecosystem is upright
  2. Pyramid of biomass in sea is generally inverted.
  3. Pyramid of biomass in sea is generally upright.
  4. Pyramid of energy is always upright.
NEET (UG) 2021
10

In the equation GPP - R = NPP R represents :

  1. Respiration losses
  2. Radiant energy
  3. Retardation factor
  4. Environmental factor
NEET (UG) 2021
11

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

  1. There is no relationship between Gross primary productivity and Net primary productivity
  2. Gross primary productivity is always more than net primary productivity
  3. Gross primary productivity is always less than net primary productivity
  4. Gross primary productivity and Net primary productivity are one and same
NEET (UG) 2020

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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)