1.
a.
a.
Direction: Choose the letter of the best answer.
1. Which among these is an example of a natural ecosystem?
a. Dam
c. subdivision
b. Grassland
d. wheat field
2. Which among these is not artificial ecosystem?
a. Corn field
c. swamp
b. Dam
d. zoo
3. Which is an example of an abiotic factor in ecosystem?
Animals
c. plants
b. Decomposers
d. temperature
4. What is the term used for the top part of the rain forest?
a. Canopy
c. subcanopy
b. Floor
d. understory
5. What is the main reason for the diminissing rainforest area in the Philippines?
Climate change
c. dyanamite fishing
b. Deforestation
d. erosion
6. Which is NOT a type of coral reef?
a. Atoll
c. fringing reef
b. Barrier reef
d. lagoon
7. What makes up a coral reef?
a. Algae
c. rocks
b. Limestone
d. lagoon
8. Which of these is called the "rainforest of the sea?
Beach
c. estuary
b. Coral reefs
d. lagoon
9. How can mangrove plants tolerate saltwater?
a. They do not absorb salt water.
b. They use salt and water to make food
C. Their bark is made up of salt-proof material.
d. They filter salt from the water using their roots.
10. Which is NOT a function of mangrove roots?
a. Filter out salt
c. absorb and store salt from the water
b. Build up shorelines d. remove impurities and pollutants from water
a.​