1. Which of the following is an example of a natural ecosystem?
Adam
B. grassland C. subdivision D. wheat field
2 Which of these is NOT an artificial ecosystem?
A com field B. dam
C. swamp
D. zoo
3. Which is an example of an abiotic factor in an ecosystem?
A ar imals
B. decomposers C. plants
D. temperature
This is the top part of a rainforest
A canopy B. floor
C. subcanopy D. understory
5. What is the main reason for the diminishing rainforest area in the Philippines?
A cimate change B. deforestation C. dynamite fishing D. erosion
6. Which is NOT a type of coral reef?
B. barrier reef C. fringing reef D. lagoon
7. Coral reefs are made up of
A age
B. mestone
C. rocks
D. sand
8. Which of these is called the rain forest of the sea ?
A beach
B. coral reef C. estuary
D. lagoon
9. How can mangrove plants tolerate saltwater? They
A do not absorb saltwater
Buse salt and water to make food
C. bark is made of salt-proof material
D. fiter sait from the water using their roots
10. Which is NOT a function of mangrove roots?
A filter sea water
C. absorb and store salt from the water
B. build up shorelines D. remove impurities and pollutants from water​