41. Natural reservoir of phosphorus is :

A Animal bones
B Rock
C Fossils
D Sea water
Answer :   Rock
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42. Consider the following statements concerning food chains
(1) removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(2) removal of most of the carnivores resulted in an increased population of deers
(3) the length of food chains is generally limited to 3-4 trophic levels due to energy loss
(4) the length of food chains may vary from 2 to 8 trophic levels
Which two of the above statements are correct?

A (2) and (3)
B (3) and (4)
C (1) and (4)
D (1) and (2)
Answer :   (2) and (3)
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43. Mass of living matter at a trophic level in an area at any time is called

A standing crop
B deteritus
C humus
D standing state
Answer :   standing crop
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44. If by radiation all nitrogenase enzymes are inactivated, then there will be no

A fixation of nitrogen in legumes
B fixation of atmospheric nitrogen
C conversion from nitrate to nitrite in legumes
D conversion from ammonium to nitrate in soil
Answer :   fixation of nitrogen in legumes
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45. Which of the following is expected to have the highest value (gm/m2 /yr) in a grassland ecosystem?

A Secondary Production
B Tertiary Production
C Gross Production (GP)
D Net Production (NP)
Answer :   Gross Production (GP)
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46. Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

A Fish
B Zooplankton
C Frog
D Phytoplankton
Answer :   Fish
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47. Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

A Sparrow
B Lion
C Goat
D Frog
Answer :   Sparrow
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48. Which one of the following is not used for construction of ecological pyramids?

A Number of individuals
B Rate of energy flow
C Fresh weight
D Dry weight
Answer :   Fresh weight
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49. Pedology is science of

A earth
B soil
C diseases
D pollution
Answer :   soil
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50. The slow rate of decomposition of fallen logs in nature is due to their

A low moisture content
B poor nitrogen content
C anaerobic environment around them
D low cellulose content
Answer :   low moisture content
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Practice More MCQ Question on Biology Section

BotanyThe Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisonTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and DevelopmentReproduction 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 IssuesBotany Miscellaneous
ZoologyAnimal KingdomStructural Organisation in AnimalsBiomoleculesDigestion and AbsorptionBreathing and Exchange of GasesBody Fluids and CirculationExcretory Products and Their EliminationLocomotion and MovementNeural Control and CoordinationChemical Coordination and IntegrationHuman ReproductionReproductive HealthEvolutionHuman Health and DiseasesBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsZoology Miscellaneous