PADI Divemaster Chapter 8 Practice Questions and Correct Answers
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Course
Padi divemaster
Institution
Padi Divemaster
Why is it important to be knowledgeable about the biological and physical properties of the aquatic realm? *Satisfies diver curiosity *Helps with other divemaster functions like planning dives according to the environmental conditions and interacting responsibly with local aquatic life *Makes diver...
PADI Divemaster Chapter 8 Practice
Questions and Correct Answers
Why is it important to be knowledgeable about the biological and physical properties of
the aquatic realm? ✅*Satisfies diver curiosity
*Helps with other divemaster functions like planning dives according to the
environmental conditions and interacting responsibly with local aquatic life
*Makes divers aware of fragile organisms and organisms that can hurt them and how to
avoid doing both
*The more you know, the more you can pass on to divers and the more they know the
more they can reduce and manage risks, have fun and help preserve it
How can you learn more about the aquatic realm? ✅*Project AWARE Specialty Diver
courses (Project AWARE program, Coral Reef Conservation, Fish Identification, PADI
Underwater Naturalist course)
*Books and online sources (AWARE-Our World, Our Water, Section Two of The
Encyclopedia of Recreational Diving, Life on an Ocean planet - comprehensive marine
science text that covers physical and biological properties of ocean ecosystems, fish
guides and fish ID slates, local school or university library
Why dive in an environmentally responsible manner? ✅*You don't want to harm
aquatic life and you are aware that bumping or kicking fragile ecosystems can cause
significant harm
*Role modeling environmentally responsible diving is in the PADI Member's Code of
Practice
*Divers aren't a major threat but hundreds of bumps/kicks by careless divers causes
real damage
*Directly preserves environment by reducing the effects you have on it and by
encouraging other divers to reduce theirs
*Divers have a growing collective voice that can influence environmental initiatives and
policies that affect the underwater world - to be credible as environmental ambassadors,
we must show that we practice what we preach.
It's important to be knowledgable about the biological and physical properties of the
aquatic realm because: ✅It helps you satisfy diver curiosity, helps you plan dives
according to the environmental conditions, you can make divers aware of particularly
fragile organisms.
To learn more about the aquatic realm: ✅Take Project AWARE Specialty Diver
Courses, take PADI Underwater Naturalist course, consult fish guides, ID slates and
similar references, check out environmental and conservation websites.
, Diving in an environmentally responsible manner is important because: ✅It helps you
role model, divers want to have credibility as ambassadors for the aquatic realm, helps
you reduce the effect you have on the environment while diving.
What percentage of the Earth does water cover? ✅Approximately 71% (salt water
makes up 97% of that water, 3% fresh but 3/4 of it is frozen in the polar ice caps)
What ultimately connects all the water on Earth? ✅The hydrological cycle connects all
water (inland and underground bodies).
*Connects in two ways - all the seas connect physically around the bottoms of the
southern continents and under the arctic ice cap.
*solar heat evaporates water making vapor in the air, it rises and forms clouds which
condense into snow and rain to fall back to Earth creating runoff (carries pollutants from
long distances inland to sea, pollution anywhere is a threat globally) which seeps into
the ground where it flows in underwater aquifers
*All inland freshwater flow is toward the ocean and reaches eventually
In what ways is the ocean vital to all life? ✅Humans/terrestrial organisms get food,
nutrient and other resources including:
*Oxygen - 98% comes from photosynthesis which the ocean makes 1/3 to 1/2 of
because of phytoplankton and cyanobacteria primarily
*Heat Distribution - ocean has the ability to absorb, carry and release on a global scale
regulating Earth's climate
What percentage of Earth is covered by water? ✅71%
The _______ theoretically connects all the water on Earth. ✅Hydrological cycle.
Two resources that the ocean provides that are essential to all life on Earth are
____________ and ___________. ✅Oxygen, heat distribution.
What is the base of the marine food chain, and why are some areas much more
productive than others? ✅Primary producers - photosynthesis by phytoplankton, which
need sunlight AND nutrients
Areas (continental shelves, polar regions) that have costal upwellings (water flowing up
from the deep) tend to be highly productive because upwellings bring nutrients to the
surface.
Open ocean has little primary productivity due to lack of nutrients, ocean bottom has
ample nutrients but sunlight doesn't penetrate that far - except in areas with thermal
vents where chemosynthesizers form small ecosystems by converting inorganic
chemical energy into useable carbohydrates.
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