Question

7. Tropical rainforests have many species that are found in great abundance. A study in the Brazilian rainforest found 487 tree species growing on a single hectare (2.5 acres). In the US and Canada together, there are only 700 species of trees on millions of acres. In one park in a Peruvian rainforest, scientists have identified over 1300 species of butterflies, while in all of Europe there are approximately 320 butterfly species. These findings suggest that:

a. rainforests are biologically less diverse than other ecosystems on earth.

b. the number of tree species and butterfly species are about the same throughout the ecosystems of the world.

c. rainforests are biologically more diverse than other ecosystems.

d. as many as 400 species a day are lost due to human activity.

e. all of the above

rainforests are biologically less diverse than other ecosystems on earth.

the number of tree species and butterfly species are about the same throughout the ecosystems of the world.

. rainforests are biologically more diverse than other ecosystems.

as many as 400 species a day are lost due to human activity.

all of the above

IncorrectQuestion 8

0 / 1 pts

8. As a solid, water floats. This means that

a. solid water is less dense than liquid water.

b. organisms in ponds, lakes, and reservoirs can survive under the ice cover.

c. this is due to hydrogen bonding changes.

d. All of the above are correct

e. none of the above is correct

solid water is less dense than liquid water.

organisms in ponds, lakes, and reservoirs can survive under the ice cover.

this is due to hydrogen bonding changes.

All of the above are correct

none of the above is correct

Answer 1

Answer to question 7.
Tropical rainforests are rainforests found near equator which receive most sunlight and rain water than temperate and obviously the polar region.
Therefore the plant and algal species are very diverse due to abundant photosynthesis to accumulate biomass.
This biomass supports the heterotrophs leading to more diverse ecosystems.
Amazon rainforest and Brazilian rainforest are good example of rain forests.
The correct option is only c. rainforests are biologically more diverse than other ecosystems.
Wrong options : a , b , d,e.
a. rainforests are biologically less diverse than other ecosystems on earth
reason : Tropical rainforests are rainforests found near equator which receive most sunlight and rain water than temperate and obviously the polar region.
Therefore the plant and algal species are very diverse due to abundant photosynthesis to accumulate biomass.
This biomass supports the heterotrophs leading to more diverse ecosystems.
b. The number of tree species and butterfly species are about the same throughout the ecosystems of the world.
Reason : Number and type of trees are never similar throughout the ecosystems of the world due to different environmental conditions which changes the flora and fauna of places .

D. as many as 400 species a day are lost due to human activity.
Reason : the number of species lost a day are nearly 150 to 200 According to the UN Environment Programme. Given number 400 is nearly double the value Of UN environment programme. .