Phytoplankton and Marine Ecosystems

The video discusses the diversity and characteristics of phytoplankton, including their size classifications and unique attributes like the ability to control vertical position in water. It highlights the role of phytoplankton as the base of the marine food chain through photosynthesis. The video also explains the complexity of energy transfer in marine ecosystems, emphasizing the concept of a food web over a simple food chain due to the intricate interactions among marine organisms.

What do the terms ultraplankton, picoplankton, and nanoplankton refer to?

• Different species of marine animals

• Types of ocean currents

• Size classes of phytoplankton

• Stages of marine plant growth

What unique feature allows dinoflagellates to control their position in the water?

• Their whip-like appendages

• Their ability to change color

• Their large size

• Their ability to photosynthesize

Which of the following is NOT a characteristic of dinoflagellates?

• They can swim against ocean currents

• They have two whip-like appendages

• They spin on their long axis

• They can control their vertical position

What is the most abundant type of phytoplankton on Earth?

• Dinoflagellates

• Coccolithophores

• Procaryotes

• Diatoms

What do coccolithophores build around their bodies?

• Calcium carbonate shells

• Protein layers

• Lipid membranes

• Silica shells

How do phytoplankton contribute to the marine food chain?

• By filtering ocean water

• Through the process of photosynthesis

• By consuming small fish

• By decomposing organic matter

Which process allows phytoplankton to grow and reproduce?

• Respiration

• Photosynthesis

• Fermentation

• Decomposition

What is a key role of phytoplankton in marine ecosystems?

• They are top predators

• They form the base of the food chain

• They decompose organic matter

• They regulate ocean temperature

What is the primary difference between a food chain and a food web?

• A food chain is found only in oceans, while a food web is found on land

• A food chain involves only plants, while a food web involves animals

• A food chain is a modern concept, while a food web is outdated

• A food chain is linear, while a food web is complex

How do high-level predators adapt their diet in a food web?

• They avoid eating lower food levels

• They eat the same food year-round

• They switch food sources based on availability

• They only eat phytoplankton