Microscopic Organisms in Ocean Ecosystems

The video explores the vastness of the ocean and its rich microbial life, focusing on the abundance and diversity of microorganisms. It highlights the significance of Prochlorococcus, a key photosynthetic organism, in oxygen production and its environmental interactions. The video also delves into nitrogen-fixing microbes, explaining their role in nutrient cycling and ecological impact. Overall, it emphasizes the critical functions these microorganisms play in global processes.

What percentage of the ocean's biomass is made up of microscopic organisms?

• 50%

• 75%

• 98%

• 100%

Which organism is known as the smallest photosynthetic cell on the planet?

• Algae

• Cyanobacteria

• Diatoms

• Prochlorococcus

What is the significance of Prochlorococcus in the ocean?

• It is the largest marine organism

• It produces a significant amount of the planet's oxygen

• It is a major predator in the ocean

• It decomposes organic matter

What is one method used to count the number of Prochlorococcus in the water?

• Spectroscopy

• Flow cytometry

• Microscopy

• Radiography

Which of the following is NOT a method used to study Prochlorococcus?

• DNA sequencing

• Flow cytometry

• Radiography

• Microscopy

What is the primary role of nitrogen-fixing microbes in the ocean?

• Photosynthesis

• Fixing atmospheric nitrogen

• Decomposing organic matter

• Producing oxygen

Which nutrient is most commonly limiting for photosynthetic organisms in the ocean?

• Phosphorus

• Silicate

• Carbon

• Nitrogen

What is the main energy source for heterotrophic cells?

• Decomposing organic matter

• Sunlight

• Photosynthesis

• Chemical reactions

How do nitrogen-fixing microbes contribute to the ocean's nutrient cycle?

• By producing oxygen

• By photosynthesis

• By decomposing organic matter

• By fixing atmospheric nitrogen

Which organisms are known as the best nitrogen fixers in the global ocean?

• Trod desium

• Diatoms

• Cyanobacteria

• Algae