Bill Nye the Science Guy Food Webs - Biology Blog

[Pages:2]Name _______________________________________________________ Date __________________ Period ______

Bill Nye the Science Guy ? Food Webs

1. What is today's show all about?!? 2. Defend this statement with an explanation: All living things depend on plants.

3. A ____________________________ shows the many connections/feeding relationships within an environment. 4. How are you connected to CORN just by eating a chicken sandwich?

5. Describe decomposers.

a. Identify the three examples of decomposers given by Alfonso.

b. Why are decomposers so important within an ecosystem?

6. A majority of the plants on Earth can be found in the ______________________. a. Why is this such a good location for plants to grow?

7. Describe the experiment done by the two kids in order to conclude that plants need light to grow!

8. One could argue that all living things ultimately depend on the _______________ (not plants!). a. List the three things plants need to make their own food.

b. The process of plants making their own food is known as PHOTOSYNTHESIS! What does "photosynthesis" actually mean?

9. In terms of gas exchange (oxygen and carbon dioxide), draw a picture in the space below to show the connection between plants and animals.

10. Horticulturists, such as those working at Epcot in Disney World, use a process known as _______________________________ in order to grow plants in locations other than soil.

11. Defend this statement with an explanation: Without the bottom of a food chain, the top can't survive.

12. The food web is based on a food/energy pyramid! There are lots of _____________________ at the base of an energy pyramid. a. Why are they found at the bottom?

b. As you travel up the food/energy pyramid, there is ( more / less ) energy to go around.

Analysis questions: 13. Circle the correct answer. All ecosystems exist on a foundation built on

a. Carnivores

b. Autotrophs

c. Herbivores

d. Omnivores

14. The arrows of food chains and food webs represent the flow of ___________________ through an ecosystem.

15. Study the energy pyramid seen to the right.

a. According to the diagram, what percentage of energy is PASSED ON from one trophic level to the next?

b. Therefore, what percentage of energy is LOST from one trophic level to the next?

c. Which organism would you expect to be the most abundant in this ecosystem?

d. Which organism would you expect to find the least number of in this ecosystem?

e. Provide an explanation for why there are less top predators than producers.

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