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Mangrove Trees

A mangrove trees is a tropical marine tree or shrub of genus Rhizhopora. Mangrove have special aerial roots and salt-filtering tap roots that enable them to thrive in brackish water ( brackish water is salty, but not as salty as sea water).

There are several species of mangrove trees found all over the world. Some prefer more salinity, while others like to be very close to a large fresh water source ( such as a river). Some prefer areas that are sheltered from waves. Some species have their roots covered with sea water everyday during high tide. Other species grow on dry land, but are still part of the ecosystem.

Mangrove need to keep their trunk and leaves above the surface of the water. Yet they also need to be firmly attached to the ground so they are not moved waves. There are three type of mangrove roots that play an important role for it:

1. support roots which directly perce the soil..

2. level-growing roots which twist upwards and downwards; with the upwards twists emerging on the water surface.

3. level-growing roots whose downwards twists (sub-roots) appear on the water surface.

Any part of a root that appears above the water flows oxygen to the plant under water surface. As the soil begins to build up, these roots produce additional roots that become embedded in the soil.(Sumber: UNAS 2008)

Questions:

1. The main idea of the text is …

A. Mangrove grow on dry land

B. Mangrove are tropical marine trees

C. There are many species of mangroves

D. Mangrove roots filter the salt of the sea-water

E. Mangrove roots are attached firmly to the ground.

2. We can conclude that most mangrove trees …

A. need salt to grow

B. grow on dry land

C. grow on sheltered areas

D. get oxygen from water

E. grow near fresh water sources..

3. In order to grow well mangroves require the following EXCEPT …

A. the roots twist upwards and downwards

B. the trunk should be above the water surface

C. the leaves should be above the water surface

D. the trees should be firmly attached to the ground

E. the parts of the plant under the water should have enough salt.

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