Phytoplankton /Diatoms and Dinoflagellates

Phytoplankton are microscopic organisms that play a crucial role in the ocean ecosystem. They produce a significant portion of Earth's oxygen and form the base of the marine food chain. Phytoplankton require sunlight and nutrients to thrive and are classified into diatoms and dinoflagellates. Their presence is vital for ocean life, and their absence could disrupt the entire marine ecosystem. Conservation efforts are essential to protect these organisms from pollution and environmental changes.

What is one of the primary roles of phytoplankton in the ocean?

• They produce sunlight.

• They absorb carbon dioxide.

• They create ocean currents.

• They generate oxygen.

Which nutrient is NOT required by phytoplankton for their growth?

• Nitrate

• Sulfur

• Phosphate

• Calcium

How do dinoflagellates move through the water?

• With tiny legs

• By contracting their bodies

• Using a whip-like tail

• By floating with the current

What percentage of Earth's oxygen is produced by phytoplankton?

• 50%

• 70%

• 60%

• 80%

What is a major threat to phytoplankton in the ocean?

• Lack of sunlight

• Overfishing

• Excessive nutrients

• Pollution