Seagrass Ecosystems and Their Importance

Seagrasses are vital marine plants forming productive ecosystems. They support diverse marine life, enhance water quality, and play a crucial role in carbon storage, holding twice as much carbon as rainforests. Seagrasses act as ecosystem engineers, stabilizing sediments and protecting coastlines. However, they face threats from pollution and overfishing. Conservation efforts are essential to protect these ecosystems, which are key to combating climate change.

What is the evolutionary origin of seagrasses?

• They evolved from marine algae.

• They are a type of coral.

• They descended from flowering land plants.

• They are a form of seaweed.

Which of the following is NOT a benefit provided by seagrass meadows?

• They increase the salinity of ocean water.

• They act as natural filters for water.

• They support global fisheries.

• They provide habitat for endangered species.

How do seagrasses contribute to global food security?

• By providing food for land animals.

• By supporting coral reefs and fisheries.

• By increasing the acidity of ocean water.

• By reducing the number of fish species.

What is 'blue carbon'?

• Carbon stored in forest soils.

• Carbon emissions from industrial activities.

• Carbon stored in the atmosphere.

• Carbon dioxide removed by marine ecosystems.

How do seagrasses differ from seaweeds in terms of carbon storage?

• Seagrasses store carbon in their leaves.

• Seaweeds store more carbon than seagrasses.

• Seagrasses have roots and rhizomes that lock carbon under sediment.

• Seagrasses release carbon back into the atmosphere.

What role do seagrasses play in coastal protection?

• They stabilize the seafloor and reduce erosion.

• They decrease the biodiversity of coastal regions.

• They increase wave energy.

• They attract predators to coastal areas.

What is the primary threat to seagrass meadows in the 21st century?

• Overfishing of small fish species.

• Increased ocean salinity.

• Pollution and runoff from coastal development.

• Natural predators like sharks.

What happens when seagrass meadows are replaced by algal dominance?

• Photosynthesis in seagrasses increases.

• The ecosystem becomes more diverse.

• Seagrasses grow more rapidly.

• The ecosystem collapses.

What is a major challenge in the restoration of seagrass meadows?

• High costs and labor intensity.

• Lack of suitable planting methods.

• Excessive growth of seagrasses.

• Inability to grow in shallow waters.

Why is it crucial to protect existing seagrass meadows?

• They are easier to restore than to protect.

• They do not contribute to carbon storage.

• They are not affected by human activities.

• They are one of the greatest tools to combat climate change.