Mice lacking dopamine β-hydroxylase are cold-intolerant but have high basal metabolic rate because:

TLS Online TPP Program

#Question id: 12970

#Unit 10. Ecological Principles

In deep-sea hydrothermal vents near the Galapagos Islands, bacteria obtain energy by oxidizing hydrogen sulphide released from the vents. Giant tube worms, which lack mouths and digestive systems, harbour the bacteria in their tissues and use them as a source of organic molecules. Clams obtain energy by filtering bacteria directly from the water, and numerous crabs and octopi feed on the clams. In this unique ecosystem, the bactena are playing the role of

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: 26845

#Unit 10. Ecological Principles

Geographic area where plants, animals, and other organisms, as well as weather and landscape, work together is called,

TLS Online TPP Program

#Question id: 26846

#Unit 10. Ecological Principles

Basic processes at work in all ecosystems, except

TLS Online TPP Program

#Question id: 26847

#Unit 10. Ecological Principles

Food chain referred to as