🌊 Part 1: Multiple Choice

1. Which human activity is the primary cause of ocean acidification?

Overfishing

Carbon dioxide emissions

Plastic pollution

Oil spills

2. What is eutrophication?

The removal of fish from the ocean

Excessive nutrient enrichment causing algal blooms

The introduction of foreign species

Changes in water temperature

3. Which environmental factors affect marine organisms? (Select all that apply)

Light availability

Oxygen levels

Water salinity

pH levels

4. How does water density affect marine life distribution?

It determines which species can float or sink

It affects water movement and nutrient distribution

It controls the temperature of the water

It has no effect on marine organisms

📝 Part 2: Short Answer Questions

5. Explain how overfishing can disrupt marine food webs. Give one specific example.

6. Describe two ways that plastic pollution affects marine animals.

7. Complete the following sentences:

a) When ocean pH decreases, the water becomes more _____________ which affects shell-forming organisms.

b) Introduced species can become _____________ when they have no natural predators in their new environment.

c) Deep ocean water typically has _____________ oxygen levels compared to surface water.

8. Explain why light availability decreases with ocean depth and how this affects marine plant life.

🔬 Part 3: Critical Thinking

9. A coastal area experiences frequent algal blooms that create dead zones. Identify the likely cause and suggest two management strategies to address this problem.

10. Water movement (currents) plays a crucial role in marine ecosystems. Explain how ocean currents affect:

a) Nutrient distribution: _________________________________

b) Marine animal migration: _________________________________

c) Temperature regulation: _________________________________

11. Design a simple investigation to test how changes in salinity affect a marine organism. Include your hypothesis, method, and what you would measure.