NASA | Phytoplankton Levels Dropping

A NASA-led study reveals a decline in phytoplankton populations, crucial marine plants that form the base of the oceanic food chain. These organisms, detectable from space by ocean color, have decreased by 1% annually in the northern hemisphere from 1998 to 2012. Phytoplankton play a vital role in absorbing carbon dioxide and releasing oxygen, contributing to the ocean-atmosphere gas exchange. The ocean absorbs about 25% of human-emitted carbon dioxide. The ongoing decrease in phytoplankton could impact atmospheric carbon levels and the food chain, though future trends remain uncertain.

What has NASA's study revealed about phytoplankton populations?

• They have increased significantly.

• They have become extinct.

• They have remained stable.

• They have decreased in recent years.

How are phytoplankton detected from space?

• By measuring ocean temperature.

• By analyzing ocean currents.

• By observing the color of the oceans.

• By tracking fish movements.

What role do phytoplankton play in the food chain?

• They are scavengers.

• They are decomposers.

• They are predators.

• They are the first level of the food chain.

In what way are phytoplankton similar to trees?

• They both produce fruit.

• They both grow in soil.

• They both absorb carbon dioxide and emit oxygen.

• They both require sunlight to survive.

What potential impact could the decrease in phytoplankton have?

• It could cause a rise in sea levels.

• It could lead to a decrease in ocean salinity.

• It could affect carbon dioxide levels in the atmosphere.

• It could increase the number of marine predators.