Question

the formation of annual ring is due to...... variation in the activity cambium? ( temperature, seasonal, rainfall, altitude)
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Answer 1

Answer:

seasonal

Explanation:

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Answer 2

Answer:

Seasonal

Explanation:

A layer of growth in the secondary xylem in a cross-section of a woody stem or branch. A tree ring is simply the layer of wood produced during the growing season of a single tree. Each tree ring marks the boundary between the dark late wood that grew at the end of the previous year and the relatively light early wood that grew at the beginning of this year.

One annual ring consists of an early wood ring and a late wood ring. Growth takes place in the cambium (a thin, continuous sheath of cells between the bark and the wood). In the spring, the cambium begins to divide. This creates new tissue and increases the diameter of the wood in two places namely,

1. Outside the cambium: The outer cells become part of the phloem. Phloem transports the food produced in the leaves to the branches, trunk and roots. Part of the phloem dies each year and becomes part of the outer bark.

2. Within cambium: The inner cells become part of the xylem. These cells increase most of the diameter of the tree. Xylem transports water and nutrients from the roots to the leaves. These cells have the greatest annual variability. When the tree is growing rapidly, the xylem cells are large and thin-walled. This early wood or spring wood is the lighter part of the tree ring. In late summer, growth slows down; xylem cell walls are thicker. This late wood or summer wood is the darker colored part of the tree ring.

Thus, annual rings and growth rings are formed due to seasonal variation in cambium activity.

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