Multiple choice

Growth rings are formed due to the activity of

  1. extrastelar cambium

  2. intrastelar cambium

  3. interstelar cambium

  4. Both 2 and 3

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tree rings grow under the bark and the bark is pushed out while the tree is growing. The inner part of a growth ring is formed early in the growing season, when growth is fast, and is known as early wood. The outer portion is the late wood, and is denser than early wood. This is formed by the activity of intrastelar cambium and interstelar cambium.

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