C. Hermit Crab
D. Heron
above?
A. Mangrove will increase in number
B. Heron will increase while shrimp will decrease
c. Shrimp will increase while heron will decrease
D. Nothing will happen to the food chain
do they have?
A. Mutualism
B. Parasitism
C. Commensalism
D. Predation
39. What is the role of crustaceans like crabs in the mangrove ecosystem?
A. They look for food in the mud
B. They serve as food to other animals
C. They help break the falling loaves of the mangrove through grazing
D. They attach themselves to the roots of the mangroves
40. How to plants and animals help one another to survive in a given ecosystem?
A. Plants give off oxygen for animal consumption, animals give off Carbon dioxide fo
plant consumption
B. Plants give off carbon dioxide for animal consumption, animals give off oxygen for
plant consumption
C. Both plants and animals give off oxygen to one another.
D. Both plants and animals give off carbon dioxide to one another
41. People's actions can change an ecosystem. Which action can make a helpful chan
in the ecosystem?
A. Harvesting corals for decoration
B. Illegal cutting of trees in the forest
C. Replanting mangrove and forest trees
D. Throwing of garbage in coastal area
42. Why are mangroves important to coral reefs?
A. Coral reefs need mangroves to grow.
B.Mangroves provide shelter for coral reefs.
C. Mangroves protect the coral reefs.
D. Coral reefs strengthen the roots of mangroves.
of the ocean.
43. Coral reefs are always compared as
A. aquarium
C. gardens
B. rainforest
D. deserts
37. Which of the following will happen i hem crab will be removed in the food chain
38. In a tropical rainforest ecosystem, snakes kill the rats for food. What type of relation​