Page 21 - prim 5 booklet 2025 Summary hajar_Neat 3

Delta Modern Language Schools
Science department
Grade 5
1st term 2024 -2025

The marine ecosystem can be destroyed by:

extreme weather
pollution

• Coral reefs bleaching happens when:

The temperature of water rises (becomes very warm), then coral reefs will get rid of the
algae living in their tissues this causes the coral reefs turn completely into white and they
often don’t survive.

• The impact of coral bleaching:

1- Fish and other marine organisms that depend on coral reefs for food and shelter
may die or move to another habitat.

2- People that depend on coral reefs and fish for food will be negatively affected.
➢ The loss of coral due to the extreme weather or pollution leads to destroying the marine

ecosystem.

• What happen When the amount of plastic increases in the sea?

The number of marine organisms decreases, so marine food webs will be affected leading
to a breakdown in the flow of energy.

• How do sea turtles get harmed by feeding on plastic?

Sea turtles cannot differentiate between jellyfish and piece of plastic in the water.

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