Mangroves Tree ( Biology )

Mangroves Tree ( Biology )

Published on 20 February 2022

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Transcript
00:00
BIOLOGY TRANSPORT IN PLANTS
00:02
So class your assignment is to search about mangroves tress.
00:03
Miss what is mangroves plant we don't know. can you give a short info.
00:04
OK, LETS BEGIN WITH A SMALL INTRO
00:06
A mangrove is a shrub or tree that grows in coastal saline or brackish water. The term is also used for tropical coastal vegetation consisting of such species. Mangroves are salt-tolerant trees, also called halophytes, and are adapted to live in harsh coastal conditions. They contain a complex salt filtration system .
00:10
Of the recognized 110 mangrove species, only about 54 species in 20 genera from 16 families constitute the "true mangroves", species that occur almost exclusively in mangrove habitats. Demonstrating convergent evolution, many of these species found similar solutions to the tropical conditions of variable salinity, tidal range (inundation), anaerobic soils, and intense sunlight. Plant biodiversity is generally low in a given mangrove.
00:13
Mangrove propagule Mangrove propagule (Rhizophora species) floating near the Great Barrier Reef.
00:13
The black mangrove, usually of moderate height, sometimes grows 18 to 21 metres (59 to 69 feet) tall. The leaves are 5 to 7.5 cm (2 to 3 inches) long, opposite, oblong or spear-shaped; the upper surface is green and glossy, the lower surface whitish or grayish. The white flowers are small, inconspicuous, and fragrant and are frequented by honeybees for their abundant nectar.
00:17
Mangrove forests are found in the warm waters of tropical oceans in regions across the world. ... The wood of Mangrove trees was traditionally used to construct homes due to its hardness. The older the Mangrove tree, the more efficient it is at carbon sequestration.  
00:25
For this purpose, mangrove species have specialized above ground roots called breathing roots or pneumatophores. In some species, these roots are pencil sized and peg like whereas in some other species they look like a knee. These roots have numerous pores through which oxygen enters into the underground tissues.
00:32
Now i going to explain each part of the mangroves tree
00:33
Root systems that arch high over the water are a distinctive feature of many mangrove species. These aerial roots take several forms. Some are stilt roots that branch and loop off the trunk and lower branches. Others are wide, wavy plank roots that extend away from the trunk. Aerial roots broaden the base of the tree and, like flying buttresses on medieval cathedrals, stabilize the shallow root system in the soft, loose soil. 
00:33
ROOTS
00:33
In addition to providing structural support, aerial roots play an important part in providing oxygen for respiration. Oxygen enters a mangrove through lenticels, thousands of cell-sized breathing pores in the bark and roots. Lenticels close tightly during high tide, thus preventing mangroves from drowning. 
00:43
Stem
00:43
Maximum vessel length (VL) was determined following standard protocols (Zimmermann and Jeje 1981, Vinya et al. 2013) by forcing air at 60–100 kPa pressure through the basal end of the fresh branch segment, while keeping the distal end dipped in water. About 1 cm of the distal end of the segment was continuously cut until bubbles were seen. Once bubbles appeared, the remaining segment was measured and recorded as the VL.
00:50
Leaves
00:50
The mangroves have special leaves to help adapt to the environment. For example: The leaves are evergreen due to the rainfall, tropical climate and constanttemperatures all year round. Due to high temperature present, the surafaces are thick and leathery, preventing excess water loss through transpiration.
00:55
That was plenty of information to make your assignment about mangroves tree.
00:57
YES
00:59
THANK YOU FOR LISTENING TO MY STORY MADE: SWAIBA HAMMAD  GRADE & YEAR: YR.10 GR.9D