Organisms and Their Nutritional Modes

The video explores ecological niches, focusing on nutritional niches and the roles species play in ecosystems. It covers key terms like obligate, facultative, aerobic, and anaerobic, and explains the differences between autotrophs, heterotrophs, and mixtotrophs. The digestive processes in heterotrophs, including ingestion, digestion, absorption, and egestion, are detailed. The video also discusses decomposers, comparing saprotrophs and detritivores, and highlights the diverse energy acquisition methods in Archaea.

What is an ecological niche?

• A type of habitat

• The role a species plays in its ecosystem

• A zone of tolerance

• A specific food source

What does 'obligate' mean in the context of organisms?

• Having a choice

• Living with oxygen

• Living without oxygen

• Having no choice

Which organisms must have oxygen to survive?

• Obligate aerobes

• Facultative anaerobes

• Facultative aerobes

• Obligate anaerobes

Which organisms can thrive in both aerobic and anaerobic environments?

• Obligate aerobes

• Obligate anaerobes

• Facultative anaerobes

• Photosynthetic organisms

What is the primary function of photosynthetic organisms?

• To consume other organisms

• To produce their own food

• To decompose organic matter

• To live in anoxic environments

What is holozoic nutrition?

• Oxidizing inorganic chemicals

• Photosynthesis

• External digestion

• Internal digestion of whole food pieces

What is a mixotroph?

• An organism that decomposes organic matter

• An organism that uses both autotrophic and heterotrophic methods

• An organism that only consumes other organisms

• An organism that only uses photosynthesis

What is the key characteristic of saprotrophs?

• Chemotrophic energy gathering

• Internal digestion

• External digestion

• Photosynthesis

Which of the following is NOT a nutritional mode found in Archaea?

• Holozoic

• Chemotrophic

• Phototrophic

• Heterotrophic

What do detritivores do?

• Perform photosynthesis

• Digest matter internally

• Digest matter externally

• Oxidize inorganic chemicals