DAY-4 CLASS-6 SOCIAL L-2 QUIZZ

Recognise the interdependence of marine life forms.

• Marine life forms depend on each other for survival.

• Marine life forms live in complete isolation.

• Marine life forms do not interact with each other.

• Marine life forms only compete and never cooperate.

What forms the foundation of marine ecosystems?

• The tiniest ocean organisms

• Large marine mammals

• Coral reefs

• Deep-sea vents

Which species form the middle of the ocean food web?

• Mid-sized species such as reef fish and octopuses

• Large predators such as sharks and whales

• Tiny plankton and algae

• Deep-sea vent bacteria

Which marine creatures can reach enormous sizes while depending on smaller marine life?

• Whales and sharks

• Sea turtles and jellyfish

• Dolphins and octopuses

• Seahorses and starfish

Phytoplankton are responsible for producing up to ___% of Earth's oxygen.

• 50%

• 10%

• 25%

• 80%

Phytoplankton form the base of what in the ocean?

• Ocean food chains

• Ocean tides

• Ocean currents

• Ocean trenches

Phytoplankton help absorb which gas from the atmosphere?

• Carbon dioxide

• Oxygen

• Nitrogen

• Methane

Seaweeds & Algae provide habitat for countless marine species.

• True

• False

Which of the following is NOT a benefit provided by seaweeds & algae?

• A) Food for herbivorous marine animals

• B) Protection from coastal erosion

• C) Producing up to 50% of Earth's oxygen

Which group of marine animals includes over 34,000 known species, features gills for breathing underwater, and fins for movement?

• Fish

• Molluscs

• Mammals

• Crustaceans