Question

QUESTION 36

1. Some species have large impacts on the structure of ecosystems due to their behavior, like beavers building dams and creating ponds from streams. This type of species is known as

   	A.	foundation species
   	B.	keystone species
   	C.	native species
   	D.	dominant species

4 points   

QUESTION 37

1. In a hypothetical ecosystem, about how many rattlesnakes feeding at the 4th trophic level would you predict could be found in a location with 1,000,000 primary producers?

   	A.	10
   	B.	100
   	C.	1,000
   	D.	10,000

4 points   

QUESTION 38

1. Two species of poisonous snakes have very similar banding patterns of brightly colored rings are strongly avoided by snake-eating hawks. This is an example of

   	A.	convergent selection
   	B.	Batesian mimicry
   	C.	Mullerian mimicry
   	D.	overlapping niches

4 points   

QUESTION 39

1. Predation is an important evolutionary force leading to changes in the traits of prey populations. Which of the following is NOT an outcome of selection for anti-predatory traits?

   	A.	resource partitioning
   	B.	cryptic coloration
   	C.	loud alarm calls
   	D.	mimicry

4 points   

QUESTION 40

1. Less industrialized societies would be characterized by

   	A.	having lower TFR
   	B.	easy access to health care professionals
   	C.	less urbanized
   	D.	few children in the work force

Answer 1

Ans 1- Keystone Species

when the activity of a species determines community structure in spite of their low abundance or biomass,that species is calle keystone species.

Ans 2- at every trophic level thier is lost of 10% enegy

so at 4th trophic level energy will be 1000

Ans 3- Mullerian mimicry-

in this several groups of organisms gain an advantage by looking like one other. all the orgainsms are offensive and obnoxius

Ans 4-resource partitioning

Preys tries to protect themselves from predators by cryptic coloration, loud alarm calls and mimicry

Ans 5-Less industrialized societies would be characterized by- less urbanized

people lives in area where is more source of eaning like industries