Tree rings are caused by: Variation in the size of companion cells Variation in the size of sieve tube members Variation in the size of tracheids Variation in the size of vessel members
Explanation:
Tree rings can be caused by a number of factors, including variations in the size of companion cells, sieve tube members, tracheids, and vessel members. The size of these cells grows as they divide and divide and divide until they reach their full maturity. As the tree's cells grow larger, they begin to create concentric rings. Cell size during formation time controls the width of each ring. Several elements, such as the availability of nutrients, the amount of water, the temperature, and the amount of light, influence the size of the cells. Differential cell growth rates can result in rings if any of these conditions are changed.
Other causes of rings include pathogens, injuries, and pests. The cells may either cease dividing or perish due to these circumstances, which then form a ring. An understanding of the tree's growth can be gleaned from the breadth of the rings. A tree with wide growth rings probably had fast expansion at one point in its life, while a tree with narrow growth rings probably experienced a more prolonged period of gradual expansion. Ring width can also be determined by the tree's age, with younger trees typically having broader rings.
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