FOOD CHAINS & FOOD WEBS
Arrange these in the correct feeding order: grass, rat, snake, hawk.
Answer: Grass → rat → snake → hawk
A bird builds its nest in a tree without harming it. Name this relationship.
Answer: Commensalism
Why are decomposers important in ecosystems?
Answer: They recycle nutrients back into the environment.
Which process removes carbon dioxide from the atmosphere?
Answer: Photosynthesis
Which organelle controls the activities of the cell?
Answer: Nucleus
In a pond ecosystem, insect larvae are eaten by small fish, and small fish are eaten by herons. Identify the secondary consumer.
Answer: Small fish
A tick feeding on a cow is an example of what type of relationship?
Answer: Parasitism
Name one non-renewable resource.
Answer: Petroleum, natural gas, or bauxite
Which process releases carbon dioxide from living organisms?
Answer: Respiration
Which structure regulates what enters and leaves the cell?
Answer: Cell membrane
What is the main source of energy for almost all food webs?
Answer: The Sun
Nitrogen-fixing bacteria living in legume roots is an example of what relationship?
Answer: Mutualism
Why does using wind or solar energy benefit the environment?
Answer: It reduces fossil fuel use and decreases pollution.
Burning fossil fuels is known as what process?
Answer: Combustion
Which organelle is known as the powerhouse of the cell?
Answer: Mitochondria
If the population of predators increases, what will most likely happen to the prey population?
Answer: The prey population will decrease
Give one named example of a predator and its prey.
Answer: Example: Snake and frog; Hawk and rat
State two negative effects of deforestation.
Answer: Loss of habitat, soil erosion, flooding, loss of biodiversity
Name the three major processes of the carbon cycle.
Answer: Photosynthesis, respiration, combustion
Name two organelles found in animal cells.
Answer: Nucleus, mitochondria, cytoplasm, cell membrane (any two)
Construct a food chain using: leaves, caterpillar, bird, cat.
Answer: Leaves → caterpillar → bird → cat
State two ways parasites depend on their hosts.
Answer: They obtain food from the host; they harm the host; they may live in or on the host (any two)
List three consequences of marine pollution in the Caribbean.
Answer: Loss of habitat, soil erosion, flooding, loss of biodiversity
Explain why cutting down forests increases carbon dioxide levels.
Answer: Less photosynthesis occurs, so less carbon dioxide is removed from the air.
A cell is observed under a microscope. It has a nucleus, cytoplasm, and cell membrane, but it does not have chloroplasts or a cell wall.
Identify the type of cell and give TWO reasons for your answer.
Answer:
It is an animal cell.
Reasons:
It does not have a cell wall.
It does not have chloroplasts.