Help With bio please!?

Question

1. Why must primary consumers eat large numbers of plants?

2. Why would be affectsed more by the loss of a specis-- a food chain or a food web? why?

3. Why are plants necessary to the path of energy through a community?

Answer 1

1. On the ecological pyramid we can see that only 10% of the energy in the producer level goes to form biomass in the second level where the primary consumers are. This is usually called the 10% law.
2. Food chains would be seriously disrupted by the loss of a species. The idea of a food web is that links in the food web have multiple connections. If one species is gone, the remaining species still have something to eat.
3. Plants are the producers. Plants change the sunlight energy to the chemical energy stored in food. This lets the energy pass through the community as food goes through the trophic levels.

Answer 2

A food chain has a producer (plant) that produces all the energy for the rest of the chain (which it recieves from the sun) via photosynthesis.
For every link in the chain, the next member recieves only 10% of the energy in the previous link.
ie. plant has 100% energy, the primary consumer (herbivore) gets only 10% and the next member will get only 1%.
THis is why food chains are almost never longer than 6 or 7 links, there is just not enough energy to surivive. So that helps with number1 and 3.

Some animals are reliant on a range of other animals or plants to eat, but others are reliant on only 1 or 2. If your food source suddenly stops and you are not phyiscally (ie like an anteater, insects that only pollinate a specific flower (which they get food from) able to eat other animals, you will die out to. This can cause a total collpase of all members as well. Pests can also do this to communities where they are introduced. eg in NZ we have honeydew on trees, Wasps have been introduced that eat the honesydew and several bird species which rely on it are dwindling in number becasue they are unable to get the same amount of energy from food as they used to. Numbers of other plants and animals can go up to, when their predator is "killed off" they will increase in number, and perhaps eat to much of a plant and kill that off, which then leads to their death as they have nothing to eat.....bad cycle (thats Q2)

Answer 3

uh it is best if you go to brooklynpubliclibrary.org and go to the on-line tutor u don't have to wait for an answer either it's live