What are the major effector molecules involved in type IV hypersensitivity reactions?

TLS Online TPP Program

#Question id: 12971

#Unit 10. Ecological Principles

One group of ecologists has suggested that producers are limited by competition for resources, primary consumers (herbivores) are limited by predation, and secondary consumers (carnivores) are limited by food. If this were true, at which of the following trophic levels would one expect to find substantial evidence for competitive exclusion?

TLS Online TPP Program

#Question id: 12972

#Unit 10. Ecological Principles

Under  some  circumstances a  population  can  split  into  two  or  more  species  without  the  existence of  geographic barriers. All of the following genetically determined behaviours could provide conditions leading to speciation EXCEPT

TLS Online TPP Program

#Question id: 12973

#Unit 10. Ecological Principles

The oceans affect the biosphere in all of the following ways except 

TLS Online TPP Program

#Question id: 12974

#Unit 10. Ecological Principles

Which lake zone would be absent in a very shallow lake?

TLS Online TPP Program

#Question id: 12975

#Unit 10. Ecological Principles

Which of the following is true with respect to oligotrophic lakes and eutrophic lakes?

TLS Online TPP Program

#Question id: 12976

#Unit 10. Ecological Principles

Which of the following is characteristic of most terrestrial biomes?