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Trees

In botany, a tree is a plant with an elongated stem, or trunk, supporting leaves or branches.

In some usages, the definition of a tree may be narrower, including only woody plants, only plants that are usable as lumber, only plants above a specified height or only perennial species. At its broadest, trees include the taller palms, the tree ferns, bananas and bamboo.

A tree typically has many secondary branches supported clear of the ground by the trunk. This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into chemical energy by photosynthesis, providing the food needed by the tree for its growth and development.

Flowers and fruit may also be present, but some trees such as conifers instead have pollen cones and seed cones, and others such as tree ferns produce spores instead.

Trees tend to be long-lived,[1] some reaching several thousand years old. The tallest known specimen on Earth is 115.6 m (379 ft) and they have a theoretical maximum height of 130 m (426 ft).[2] Trees have been in existence on the Earth for 370 million years. Trees are not a taxonomic group but are a number of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants and make full use of the sunlight.

Trees play a significant role in reducing erosion and moderating the climate. They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues. Trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are one of the most biodiverse habitats in the world. Trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In parts of the world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture. Because of their longevity and usefulness, trees have always been revered and they play a role in many of the world's mythologies.

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Idő Cím
06:00:00 06:07:23 The Most Amazing Thing About Trees
06:07:23 06:12:57 The importance of Trees
06:12:57 06:18:24 Methuselah, One of the World's Oldest Current Living Tree.
06:18:24 06:19:52 Redwoods: The Tallest Trees
06:19:52 06:28:02 Yosemite Nature Notes - 11 - Big Trees
06:28:02 06:32:06 Top Ten Amazing Trees by Toptenz.net
06:32:06 06:41:49 Amazing Trees
06:41:49 06:44:05 Giant trees in Tropical Rainforest, Cameroon
06:44:05 06:47:19 Cool Tree Pictures
06:47:19 06:48:49 Amazing Ugly Bizarre Sexy Trees
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06:51:43 06:57:37 Tiberiu Banica - Trees - Photography
06:57:37 06:59:43 Ash Trees : Ash Tree Pictures
06:59:43 07:02:59 Bonsai trees
07:02:59 07:10:22 The Most Amazing Thing About Trees
07:10:22 07:15:56 The importance of Trees
07:15:56 07:21:23 Methuselah, One of the World's Oldest Current Living Tree.
07:21:23 07:22:51 Redwoods: The Tallest Trees
07:22:51 07:31:01 Yosemite Nature Notes - 11 - Big Trees
07:31:01 07:35:05 Top Ten Amazing Trees by Toptenz.net
07:35:05 07:44:48 Amazing Trees
07:44:48 07:47:04 Giant trees in Tropical Rainforest, Cameroon
07:47:04 07:50:18 Cool Tree Pictures
07:50:18 07:51:48 Amazing Ugly Bizarre Sexy Trees
07:51:48 07:54:42 Beautiful Earth - Amazing Sequioa Trees
07:54:42 08:00:36 Tiberiu Banica - Trees - Photography
08:00:36 08:02:42 Ash Trees : Ash Tree Pictures
08:02:42 08:05:58 Bonsai trees
08:05:58 08:13:21 The Most Amazing Thing About Trees
08:13:21 08:18:55 The importance of Trees
08:18:55 08:24:22 Methuselah, One of the World's Oldest Current Living Tree.
08:24:22 08:25:50 Redwoods: The Tallest Trees
08:25:50 08:34:00 Yosemite Nature Notes - 11 - Big Trees
08:34:00 08:38:04 Top Ten Amazing Trees by Toptenz.net
08:38:04 08:47:47 Amazing Trees
08:47:47 08:50:03 Giant trees in Tropical Rainforest, Cameroon
08:50:03 08:53:17 Cool Tree Pictures
08:53:17 08:54:47 Amazing Ugly Bizarre Sexy Trees
08:54:47 08:57:41 Beautiful Earth - Amazing Sequioa Trees
08:57:41 09:03:35 Tiberiu Banica - Trees - Photography
09:03:35 09:05:41 Ash Trees : Ash Tree Pictures
09:05:41 09:08:57 Bonsai trees
09:08:57 09:16:20 The Most Amazing Thing About Trees
09:16:20 09:21:54 The importance of Trees
09:21:54 09:27:21 Methuselah, One of the World's Oldest Current Living Tree.
09:27:21 09:28:49 Redwoods: The Tallest Trees
09:28:49 09:36:59 Yosemite Nature Notes - 11 - Big Trees
09:36:59 09:41:03 Top Ten Amazing Trees by Toptenz.net
09:41:03 09:50:46 Amazing Trees
09:50:46 09:53:02 Giant trees in Tropical Rainforest, Cameroon
09:53:02 09:56:16 Cool Tree Pictures
09:56:16 09:57:46 Amazing Ugly Bizarre Sexy Trees
09:57:46 10:00:40 Beautiful Earth - Amazing Sequioa Trees
10:00:40 10:06:34 Tiberiu Banica - Trees - Photography
10:06:34 10:08:40 Ash Trees : Ash Tree Pictures
10:08:40 10:11:56 Bonsai trees
10:11:56 10:19:19 The Most Amazing Thing About Trees
10:19:19 10:24:53 The importance of Trees
10:24:53 10:30:20 Methuselah, One of the World's Oldest Current Living Tree.
10:30:20 10:31:48 Redwoods: The Tallest Trees
10:31:48 10:39:58 Yosemite Nature Notes - 11 - Big Trees
10:39:58 10:44:02 Top Ten Amazing Trees by Toptenz.net
10:44:02 10:53:45 Amazing Trees
10:53:45 10:56:01 Giant trees in Tropical Rainforest, Cameroon
10:56:01 10:59:15 Cool Tree Pictures
10:59:15 11:00:45 Amazing Ugly Bizarre Sexy Trees
11:00:45 11:03:39 Beautiful Earth - Amazing Sequioa Trees
11:03:39 11:09:33 Tiberiu Banica - Trees - Photography
11:09:33 11:11:39 Ash Trees : Ash Tree Pictures
11:11:39 11:14:55 Bonsai trees
11:14:55 11:22:18 The Most Amazing Thing About Trees
11:22:18 11:27:52 The importance of Trees
11:27:52 11:33:19 Methuselah, One of the World's Oldest Current Living Tree.
11:33:19 11:34:47 Redwoods: The Tallest Trees
11:34:47 11:42:57 Yosemite Nature Notes - 11 - Big Trees
11:42:57 11:47:01 Top Ten Amazing Trees by Toptenz.net
11:47:01 11:56:44 Amazing Trees
11:56:44 11:59:00 Giant trees in Tropical Rainforest, Cameroon
11:59:00 12:02:14 Cool Tree Pictures
12:02:14 12:03:44 Amazing Ugly Bizarre Sexy Trees
12:03:44 12:06:38 Beautiful Earth - Amazing Sequioa Trees
12:06:38 12:12:32 Tiberiu Banica - Trees - Photography
12:12:32 12:14:38 Ash Trees : Ash Tree Pictures
12:14:38 12:17:54 Bonsai trees
12:17:54 12:25:17 The Most Amazing Thing About Trees
12:25:17 12:30:51 The importance of Trees
12:30:51 12:36:18 Methuselah, One of the World's Oldest Current Living Tree.
12:36:18 12:37:46 Redwoods: The Tallest Trees
12:37:46 12:45:56 Yosemite Nature Notes - 11 - Big Trees
12:45:56 12:50:00 Top Ten Amazing Trees by Toptenz.net
12:50:00 12:59:43 Amazing Trees
12:59:43 13:01:59 Giant trees in Tropical Rainforest, Cameroon
13:01:59 13:05:13 Cool Tree Pictures
13:05:13 13:06:43 Amazing Ugly Bizarre Sexy Trees
13:06:43 13:09:37 Beautiful Earth - Amazing Sequioa Trees
13:09:37 13:15:31 Tiberiu Banica - Trees - Photography
13:15:31 13:17:37 Ash Trees : Ash Tree Pictures
13:17:37 13:20:53 Bonsai trees
13:20:53 13:28:16 The Most Amazing Thing About Trees
13:28:16 13:33:50 The importance of Trees
13:33:50 13:39:17 Methuselah, One of the World's Oldest Current Living Tree.
13:39:17 13:40:45 Redwoods: The Tallest Trees
13:40:45 13:48:55 Yosemite Nature Notes - 11 - Big Trees
13:48:55 13:52:59 Top Ten Amazing Trees by Toptenz.net
13:52:59 14:02:42 Amazing Trees
14:02:42 14:04:58 Giant trees in Tropical Rainforest, Cameroon
14:04:58 14:08:12 Cool Tree Pictures
14:08:12 14:09:42 Amazing Ugly Bizarre Sexy Trees
14:09:42 14:12:36 Beautiful Earth - Amazing Sequioa Trees
14:12:36 14:18:30 Tiberiu Banica - Trees - Photography
14:18:30 14:20:36 Ash Trees : Ash Tree Pictures
14:20:36 14:23:52 Bonsai trees
14:23:52 14:31:15 The Most Amazing Thing About Trees
14:31:15 14:36:49 The importance of Trees
14:36:49 14:42:16 Methuselah, One of the World's Oldest Current Living Tree.
14:42:16 14:43:44 Redwoods: The Tallest Trees
14:43:44 14:51:54 Yosemite Nature Notes - 11 - Big Trees
14:51:54 14:55:58 Top Ten Amazing Trees by Toptenz.net
14:55:58 15:05:41 Amazing Trees
15:05:41 15:07:57 Giant trees in Tropical Rainforest, Cameroon
15:07:57 15:11:11 Cool Tree Pictures
15:11:11 15:12:41 Amazing Ugly Bizarre Sexy Trees
15:12:41 15:15:35 Beautiful Earth - Amazing Sequioa Trees
15:15:35 15:21:29 Tiberiu Banica - Trees - Photography
15:21:29 15:23:35 Ash Trees : Ash Tree Pictures
15:23:35 15:26:51 Bonsai trees
15:26:51 15:34:14 The Most Amazing Thing About Trees
15:34:14 15:39:48 The importance of Trees
15:39:48 15:45:15 Methuselah, One of the World's Oldest Current Living Tree.
15:45:15 15:46:43 Redwoods: The Tallest Trees
15:46:43 15:54:53 Yosemite Nature Notes - 11 - Big Trees
15:54:53 15:58:57 Top Ten Amazing Trees by Toptenz.net
15:58:57 16:08:40 Amazing Trees
16:08:40 16:10:56 Giant trees in Tropical Rainforest, Cameroon
16:10:56 16:14:10 Cool Tree Pictures
16:14:10 16:15:40 Amazing Ugly Bizarre Sexy Trees
16:15:40 16:18:34 Beautiful Earth - Amazing Sequioa Trees
16:18:34 16:24:28 Tiberiu Banica - Trees - Photography
16:24:28 16:26:34 Ash Trees : Ash Tree Pictures
16:26:34 16:29:50 Bonsai trees
16:29:50 16:37:13 The Most Amazing Thing About Trees
16:37:13 16:42:47 The importance of Trees
16:42:47 16:48:14 Methuselah, One of the World's Oldest Current Living Tree.
16:48:14 16:49:42 Redwoods: The Tallest Trees
16:49:42 16:57:52 Yosemite Nature Notes - 11 - Big Trees
16:57:52 17:01:56 Top Ten Amazing Trees by Toptenz.net
17:01:56 17:11:39 Amazing Trees
17:11:39 17:13:55 Giant trees in Tropical Rainforest, Cameroon
17:13:55 17:17:09 Cool Tree Pictures
17:17:09 17:18:39 Amazing Ugly Bizarre Sexy Trees
17:18:39 17:21:33 Beautiful Earth - Amazing Sequioa Trees
17:21:33 17:27:27 Tiberiu Banica - Trees - Photography
17:27:27 17:29:33 Ash Trees : Ash Tree Pictures
17:29:33 17:32:49 Bonsai trees
17:32:49 17:40:12 The Most Amazing Thing About Trees
17:40:12 17:45:46 The importance of Trees
17:45:46 17:51:13 Methuselah, One of the World's Oldest Current Living Tree.
17:51:13 17:52:41 Redwoods: The Tallest Trees
17:52:41 18:00:51 Yosemite Nature Notes - 11 - Big Trees
18:00:51 18:04:55 Top Ten Amazing Trees by Toptenz.net
18:04:55 18:14:38 Amazing Trees
18:14:38 18:16:54 Giant trees in Tropical Rainforest, Cameroon
18:16:54 18:20:08 Cool Tree Pictures
18:20:08 18:21:38 Amazing Ugly Bizarre Sexy Trees
18:21:38 18:24:32 Beautiful Earth - Amazing Sequioa Trees
18:24:32 18:30:26 Tiberiu Banica - Trees - Photography
18:30:26 18:32:32 Ash Trees : Ash Tree Pictures
18:32:32 18:35:48 Bonsai trees
18:35:48 18:43:11 The Most Amazing Thing About Trees
18:43:11 18:48:45 The importance of Trees
18:48:45 18:54:12 Methuselah, One of the World's Oldest Current Living Tree.
18:54:12 18:55:40 Redwoods: The Tallest Trees
18:55:40 19:03:50 Yosemite Nature Notes - 11 - Big Trees
19:03:50 19:07:54 Top Ten Amazing Trees by Toptenz.net
19:07:54 19:17:37 Amazing Trees
19:17:37 19:19:53 Giant trees in Tropical Rainforest, Cameroon
19:19:53 19:23:07 Cool Tree Pictures
19:23:07 19:24:37 Amazing Ugly Bizarre Sexy Trees
19:24:37 19:27:31 Beautiful Earth - Amazing Sequioa Trees
19:27:31 19:33:25 Tiberiu Banica - Trees - Photography
19:33:25 19:35:31 Ash Trees : Ash Tree Pictures
19:35:31 19:38:47 Bonsai trees
19:38:47 19:46:10 The Most Amazing Thing About Trees
19:46:10 19:51:44 The importance of Trees
19:51:44 19:57:11 Methuselah, One of the World's Oldest Current Living Tree.
19:57:11 19:58:39 Redwoods: The Tallest Trees
19:58:39 20:06:49 Yosemite Nature Notes - 11 - Big Trees
20:06:49 20:10:53 Top Ten Amazing Trees by Toptenz.net
20:10:53 20:20:36 Amazing Trees
20:20:36 20:22:52 Giant trees in Tropical Rainforest, Cameroon
20:22:52 20:26:06 Cool Tree Pictures
20:26:06 20:27:36 Amazing Ugly Bizarre Sexy Trees
20:27:36 20:30:30 Beautiful Earth - Amazing Sequioa Trees
20:30:30 20:36:24 Tiberiu Banica - Trees - Photography
20:36:24 20:38:30 Ash Trees : Ash Tree Pictures
20:38:30 20:41:46 Bonsai trees
20:41:46 20:49:09 The Most Amazing Thing About Trees
20:49:09 20:54:43 The importance of Trees
20:54:43 21:00:10 Methuselah, One of the World's Oldest Current Living Tree.
21:00:10 21:01:38 Redwoods: The Tallest Trees
21:01:38 21:09:48 Yosemite Nature Notes - 11 - Big Trees
21:09:48 21:13:52 Top Ten Amazing Trees by Toptenz.net
21:13:52 21:23:35 Amazing Trees
21:23:35 21:25:51 Giant trees in Tropical Rainforest, Cameroon
21:25:51 21:29:05 Cool Tree Pictures
21:29:05 21:30:35 Amazing Ugly Bizarre Sexy Trees
21:30:35 21:33:29 Beautiful Earth - Amazing Sequioa Trees
21:33:29 21:39:23 Tiberiu Banica - Trees - Photography
21:39:23 21:41:29 Ash Trees : Ash Tree Pictures
21:41:29 21:44:45 Bonsai trees
21:44:45 21:52:08 The Most Amazing Thing About Trees
21:52:08 21:57:42 The importance of Trees
21:57:42 22:03:09 Methuselah, One of the World's Oldest Current Living Tree.
22:03:09 22:04:37 Redwoods: The Tallest Trees
22:04:37 22:12:47 Yosemite Nature Notes - 11 - Big Trees
22:12:47 22:16:51 Top Ten Amazing Trees by Toptenz.net
22:16:51 22:26:34 Amazing Trees
22:26:34 22:28:50 Giant trees in Tropical Rainforest, Cameroon
22:28:50 22:32:04 Cool Tree Pictures
22:32:04 22:33:34 Amazing Ugly Bizarre Sexy Trees
22:33:34 22:36:28 Beautiful Earth - Amazing Sequioa Trees
22:36:28 22:42:22 Tiberiu Banica - Trees - Photography
22:42:22 22:44:28 Ash Trees : Ash Tree Pictures
22:44:28 22:47:44 Bonsai trees
22:47:44 22:55:07 The Most Amazing Thing About Trees
22:55:07 23:00:41 The importance of Trees
23:00:41 23:06:08 Methuselah, One of the World's Oldest Current Living Tree.
23:06:08 23:07:36 Redwoods: The Tallest Trees
23:07:36 23:15:46 Yosemite Nature Notes - 11 - Big Trees
23:15:46 23:19:50 Top Ten Amazing Trees by Toptenz.net
23:19:50 23:29:33 Amazing Trees
23:29:33 23:31:49 Giant trees in Tropical Rainforest, Cameroon
23:31:49 23:35:03 Cool Tree Pictures
23:35:03 23:36:33 Amazing Ugly Bizarre Sexy Trees
23:36:33 23:39:27 Beautiful Earth - Amazing Sequioa Trees
23:39:27 23:45:21 Tiberiu Banica - Trees - Photography
23:45:21 23:47:27 Ash Trees : Ash Tree Pictures
23:47:27 23:50:43 Bonsai trees
23:50:43 23:58:06 The Most Amazing Thing About Trees
23:58:06 00:03:40 The importance of Trees
00:03:40 00:09:07 Methuselah, One of the World's Oldest Current Living Tree.
00:09:07 00:10:35 Redwoods: The Tallest Trees
00:10:35 00:18:45 Yosemite Nature Notes - 11 - Big Trees
00:18:45 00:22:49 Top Ten Amazing Trees by Toptenz.net
00:22:49 00:32:32 Amazing Trees
00:32:32 00:34:48 Giant trees in Tropical Rainforest, Cameroon
00:34:48 00:38:02 Cool Tree Pictures
00:38:02 00:39:32 Amazing Ugly Bizarre Sexy Trees
00:39:32 00:42:26 Beautiful Earth - Amazing Sequioa Trees
00:42:26 00:48:20 Tiberiu Banica - Trees - Photography
00:48:20 00:50:26 Ash Trees : Ash Tree Pictures
00:50:26 00:53:42 Bonsai trees
00:53:42 01:01:05 The Most Amazing Thing About Trees
01:01:05 01:06:39 The importance of Trees
01:06:39 01:12:06 Methuselah, One of the World's Oldest Current Living Tree.
01:12:06 01:13:34 Redwoods: The Tallest Trees
01:13:34 01:21:44 Yosemite Nature Notes - 11 - Big Trees
01:21:44 01:25:48 Top Ten Amazing Trees by Toptenz.net
01:25:48 01:35:31 Amazing Trees
01:35:31 01:37:47 Giant trees in Tropical Rainforest, Cameroon
01:37:47 01:41:01 Cool Tree Pictures
01:41:01 01:42:31 Amazing Ugly Bizarre Sexy Trees
01:42:31 01:45:25 Beautiful Earth - Amazing Sequioa Trees
01:45:25 01:51:19 Tiberiu Banica - Trees - Photography
01:51:19 01:53:25 Ash Trees : Ash Tree Pictures
01:53:25 01:56:41 Bonsai trees
01:56:41 02:04:04 The Most Amazing Thing About Trees
02:04:04 02:09:38 The importance of Trees
02:09:38 02:15:05 Methuselah, One of the World's Oldest Current Living Tree.
02:15:05 02:16:33 Redwoods: The Tallest Trees
02:16:33 02:24:43 Yosemite Nature Notes - 11 - Big Trees
02:24:43 02:28:47 Top Ten Amazing Trees by Toptenz.net
02:28:47 02:38:30 Amazing Trees
02:38:30 02:40:46 Giant trees in Tropical Rainforest, Cameroon
02:40:46 02:44:00 Cool Tree Pictures
02:44:00 02:45:30 Amazing Ugly Bizarre Sexy Trees
02:45:30 02:48:24 Beautiful Earth - Amazing Sequioa Trees
02:48:24 02:54:18 Tiberiu Banica - Trees - Photography
02:54:18 02:56:24 Ash Trees : Ash Tree Pictures
02:56:24 02:59:40 Bonsai trees
02:59:40 03:07:03 The Most Amazing Thing About Trees
03:07:03 03:12:37 The importance of Trees
03:12:37 03:18:04 Methuselah, One of the World's Oldest Current Living Tree.
03:18:04 03:19:32 Redwoods: The Tallest Trees
03:19:32 03:27:42 Yosemite Nature Notes - 11 - Big Trees
03:27:42 03:31:46 Top Ten Amazing Trees by Toptenz.net
03:31:46 03:41:29 Amazing Trees
03:41:29 03:43:45 Giant trees in Tropical Rainforest, Cameroon
03:43:45 03:46:59 Cool Tree Pictures
03:46:59 03:48:29 Amazing Ugly Bizarre Sexy Trees
03:48:29 03:51:23 Beautiful Earth - Amazing Sequioa Trees
03:51:23 03:57:17 Tiberiu Banica - Trees - Photography
03:57:17 03:59:23 Ash Trees : Ash Tree Pictures
03:59:23 04:02:39 Bonsai trees
04:02:39 04:10:02 The Most Amazing Thing About Trees
04:10:02 04:15:36 The importance of Trees
04:15:36 04:21:03 Methuselah, One of the World's Oldest Current Living Tree.
04:21:03 04:22:31 Redwoods: The Tallest Trees
04:22:31 04:30:41 Yosemite Nature Notes - 11 - Big Trees
04:30:41 04:34:45 Top Ten Amazing Trees by Toptenz.net
04:34:45 04:44:28 Amazing Trees
04:44:28 04:46:44 Giant trees in Tropical Rainforest, Cameroon
04:46:44 04:49:58 Cool Tree Pictures
04:49:58 04:51:28 Amazing Ugly Bizarre Sexy Trees
04:51:28 04:54:22 Beautiful Earth - Amazing Sequioa Trees
04:54:22 05:00:16 Tiberiu Banica - Trees - Photography
05:00:16 05:02:22 Ash Trees : Ash Tree Pictures
05:02:22 05:05:38 Bonsai trees
05:05:38 05:13:01 The Most Amazing Thing About Trees
05:13:01 05:18:35 The importance of Trees
05:18:35 05:24:02 Methuselah, One of the World's Oldest Current Living Tree.
05:24:02 05:25:30 Redwoods: The Tallest Trees
05:25:30 05:33:40 Yosemite Nature Notes - 11 - Big Trees
05:33:40 05:37:44 Top Ten Amazing Trees by Toptenz.net
05:37:44 05:47:27 Amazing Trees
05:47:27 05:49:43 Giant trees in Tropical Rainforest, Cameroon
05:49:43 05:52:57 Cool Tree Pictures
05:52:57 05:54:27 Amazing Ugly Bizarre Sexy Trees
05:54:27 05:57:21 Beautiful Earth - Amazing Sequioa Trees
05:57:21 06:03:15 Tiberiu Banica - Trees - Photography