Phosphoric acid is tribasic, with pKa of 2.14, 6.86 and 12.4. The ionic form that predominates at pH 3.2 is

TLS Online TPP Program

#Question id: 12004

#Unit 10. Ecological Principles

The figure above shows the distribution of 10 plant species that grow along a regular environmental gradient, such as depth of the water table in a river valley. All other environmental factors are similar. This figure demonstrates that

TLS Online TPP Program

#Question id: 12005

#Unit 10. Ecological Principles

Acid  rain  damage  depends  on  the  buffering  capacity  of  the  soils  in  a  given  region.  Damage  has  been  greatest where the soil layer is

TLS Online TPP Program

#Question id: 12006

#Unit 10. Ecological Principles

Nitrogen is a major environmental pollutant of groundwater in many parts of the world. What is the major cause of this nitrogen accumulation in groundwater?

TLS Online TPP Program

#Question id: 12007

#Unit 10. Ecological Principles

Sewall  Wright's  metaphor  of  evolution  on  an  adaptive  landscape describes a  population  as  occupying  a  field  of genotypes  graded  by  contours  delimiting  gene  combinations  of  equal  fitness.  The  evolutionary  mechanism  most likely to move a population consistently "uphill"  toward adaptive peaks on this landscape is

TLS Online TPP Program

#Question id: 12008

#Unit 10. Ecological Principles

When exposed to a cold environment for several weeks, many small mammals dramatically increase their capacity for heat production primarily by means of

TLS Online TPP Program

#Question id: 12009

#Unit 10. Ecological Principles

Charles Darwin discussed all of the following EXCEPT: