Name: _______________________ Grade and Subject: _________________ ________________________ Date: _______________ ________________________ ________________________ ________________________ ________________________

Teacher: _______________________

How do you identify the components of a food chain in an ecosystem?

Objectives:
At the end of the lesson the students should be able to:
• Distinguish between producers and consumers.
• Analyze the transfer of energy from one organism to another.
• Construct a food chain in a given ecosystem.

Material:
An article about “Monfort Bat cave”
Activity Sheet
Procedure:
1. Read an article about “Monfort Bat Cave”
2. Read the following questions, and write your answer on the space provided. The Island of Samal, part of Davao del Norte Province, is off the coast of Mindanao. In this island is the Monfort Bat Cave which is approximately 245 feet (75 meters) long and has five entrance. Bats cover 75 percent of its ceilings and walls. An estimated 1.8 million bats, are overloading Monfort Bat Cave on the Philippines’ Samal Island. Figure 1. Geoffroy’s rousette fruit bats clinging on walls and ceiling of the cave Geoffroy’s rousette fruit bats feed on fruit and nectar. Their role as pollinators and seed dispersers is essential in sustaining Philippines forests, including such important commercial fruits as durian. Each bat consumes 1 ½ to 3 times its body weight nightly in fruit and nectar. This colony could consume 550 tons (500,000 kilogram) of nectar from durian and other trees, pollinating an incredible number of flowers. Worldwide,cave-dwellingt bats are in alarming decline due to human disturbance and destruction of their cave roots. In some areas, including Samal Island, bats are captured and eaten by humans. Colonies like the one in Monfort Bat Cave are now rare and in urgent need of protection. Their loss would endanger the health of forest and human of economies. The bat’s colony should be able to survive natural predators-crows,rats 10-foot (3-meter) pythons and occasional monitor lizards-just as bat populations do elsewhere. Untamed dogs and cats, however, also seem to do bathunting Monfort Bat Cave. |
Q2. What are the organisms found in the surrounding area of Monfort Bat Cave?
List them down in the table below.

Table 1. Organism found in Monfort Bat Cave Plants | Animals | | | | | | | | | | | | | | |
Q3. What group/s of organisms are considered as producers?
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Q4. What part os the durian trees and other trees served as food for the bats?
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Q5. The population of cave-dwelling bats is declining because they are eaten by other organisms. What are these organisms that feed on bats?
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Q6. Among the organisms that feed on bats, are there organisms that possibly feed on the predators of bats? ___Yes ___No
3. Divide the organisms into the following categories as shown in the table below:
Table 2. Categories of organisms living in the Monfort Bat Cave Producers | 1st order Consumer | 2nd Order Consumer | | | | | | | | | | | | | | | | | | | | | |

4. Based on Table 2,construct a food chain with at least 3 organisms representing the producer,1st consumer and 2nd order consumer.

Q7. You have just analyzed the transfer of energy by categorizing the organisms according to their trophic level. In your own words describe food chain.
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Q8. Without decomposers, will producers and consumers stay alive? Why?
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Q9. Without producers, will consumers stay alive? Why?
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