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double negatives can be confusing, but logically you're asking why trapical rain forest trees have rings, if i'm correct in that then i can say that the question makes an interesting assumption: that rainforest trees have rings.
when trees go through seasonal growth they create the dark and light portions of the trees ,light bands are made in times of high growth like summer and during rainy seasons and the dark portions are formed because the xylem forming in the middle doesn't grow as quickly so becomes denser, this happens in the winter or in dry seasons.
if you were to put at oak tree in a lab without any seasons you would have an extremely hard time telling how old it is because the rings would be either very hard to see or impossible to see at all unless via chemical means. the constant growth will make it so that it is hard to see how old the tree is.
that being said, some trees in tropical areas have rings but that's because of relatively dry and wet seasons, wet seasons promote growth and dry seasons don't.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agocos the temp and water availability is even trout the year. no seasons=no rings
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Why are there more plants in the tropics than in the desert?
There is much more rainfall in the tropics than in the desert which supports a greater number and variety of plants.
What are annual growth rings most common in?
Annual growth rings are commonly studied in trees.
What is the definition of tree growth rings?
thick layersmof secondary xylem , or wood , oftem form rings
What are the other five plants that grow in the tropics?
they are gingers, calatheas, bamboo, ferns, and palmtrees
Which of these is an indicator of the age of a woody plant?
The number of growth rings
Can growth rings be found in plants and animals?
Do your homework and you would know.
Do all vascular plants develop annual rings?
No, they don't.Vascular plants are those which have phloem and xylem structures within them to transport water and nutrients around the plant. Most of the plants you see around you are vascular. Think about grass or herbaceous plants - you won't find growth rings in those if you cut them through the middle, because they do not have cambium in their vascular bundles to initiate secondary growth. Most of the subtropical trees also do not develop annual growth rings although they have cambium because their apical growth never stops.Growth rings occur in plants having cambium and growing in a situation where there is disparity in the seasonal growth. During active growth period, as in spring season, more conduction of raw materials takes place hence the trachieds are broader and during autumn season when the plant prepares for winter, there is lesser conductivity through the xylem elements which makes their trachieds smaller. Thus the rings are caused by differential seasonal growth of xylem elements.----------------------------------In addition, since the tropical climates don't have the large changes in temperature and light hours that the temperate zones have, the vascular, woody plants don't have annual rings. They may form "growth" rings though. If they have a severe dry spell or severe hot or cool spell, or a grass fire, etc., then the tree may develop a pause in active growth and thereby form a "growth" ring. A tree in the tropics could form one growth ring in five years. Then again, it could form five growth rings in one year (that would be a rough year)The term growth ring is a better, more inclusive term than annual ring.Phloem
Why do tropical hardwood trees have small spacing between their annular rings?
In the tropics trees do not stop growing. they grow at a constant speed throughout the seasons because in the tropics it is alsways hot and humid. Tropical trees do not have "annual growth rings" per se, meaning that the rings seens in a cross section are just growth rings (not annual ones). This is in contrast to trees that grow in the temperate zones that have 4 well defined seasons. In these zones the trees do not grow in winter. In the spring, with new growth, the cambium layer of the tree trunk puts out new xylem and phloem cells which form a new "annual ring" over the cells which stopped growing during winter. These are genuine "annual rings" and tropical trees do not have these because they do not experience periods of growth and non-growth.
Why are there more plants in the tropics than in the desert?
There is much more rainfall in the tropics than in the desert which supports a greater number and variety of plants.
Where can you find the most flowering plants?
tropics
What are annual growth rings most common in?
Annual growth rings are commonly studied in trees.
What are other word for growth rings?
annual rings
What plants have rings?
Trees show growth rings on the cross-section of their trunks.
Do invertebrates appear in growth rings?
A clams growth rings can be, tan, gold, brown, even red.
What are some tropical plants in Antarctica?
Antarctica is polar: tropical plants grow in the tropics. There are no tropical plants in Antarctica.
Why the jungle are located to the tropics?
Jungles are usually found it hot tropical areas because of the humidity, it helps the plants grow because more humidity often = more rain = plant growth.
What plants are in the tropical seasonal forest?
In the tropics there are no real seasons (as there are in temperate climates) and therefor the plants that grow in the tropics do not show seasonal behaviour. However, in the tropics plants do still have times for flowering, seeding etc. but these are no synchronised across all species. There are also some climates where there are wet (when plants are able to grow) and very dry periods (when plants wither) some plant species are adapted to this variability.
