PADI Marine Biology & Conservation 3

Question 1

What is the function of the lateral line system found in most bony fish?

Accepted Answer

It detects vibrations and water movement changes

Answer

It regulates buoyancy by sensing water pressure

Answer

It filters oxygen from water

Answer

It controls coloration for camouflage

Question 2

Sea turtles are known to return to the same beach where they were born to nest. What is this behavior called?

Accepted Answer

Natal homing

Answer

Migration

Answer

Philopatry

Answer

Imprinting

Question 3

Which process describes how nutrients cycle from dead organic matter back into the marine food web?

Accepted Answer

Decomposition by bacteria and fungi

Answer

Photosynthesis

Answer

Predation

Answer

Upwelling

Question 4

What term describes zones in the ocean that receive no sunlight and rely on chemosynthesis rather than photosynthesis for energy?

Accepted Answer

Hydrothermal vent communities

Answer

Photic zones

Answer

Mesopelagic zones

Answer

Abyssopelagic zones

Question 5

Which factor most directly causes seasonal 'dead zones' in coastal waters?

Accepted Answer

Nutrient runoff causing algal blooms and hypoxia

Answer

Overfishing of apex predators

Answer

Coral bleaching events

Answer

Ocean acidification lowering pH

Question 6

A diver encounters a school of fish that suddenly all turn in the same direction simultaneously. What is this coordinated behavior called?

Accepted Answer

Shoaling and schooling

Answer

Herding

Answer

Flocking

Answer

Swarming

Question 7

What is the primary purpose of a Marine Protected Area (MPA)?

Accepted Answer

To conserve marine biodiversity by restricting human activities in designated areas

Answer

To provide exclusive fishing rights to local communities

Answer

To create underwater tourism destinations

Answer

To test new fishing technologies