Branch collar

High school (ages 12+)
Animals & Nature

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/branch-collar

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the formation mechanism?Result of basipetal branch growth followed by overlapping, seasonal trunk cambial activity
2. What is the primary functions?Structural support, stress resistance, and compartmentalization of decay (CODIT)
3. What is a branch collar on a tree?A branch collar is a swollen, shoulder‑like area where a branch meets the trunk. It is made of layers of trunk tissue that grow around the branch over many years. The collar helps the branch stay strong and keeps the tree healthy.
4. Why does the branch collar look different on different trees?The collar’s shape changes with the species, how steep the branch is, how old the tree is, and the weather it grows in. These factors make each collar unique.

Basipetal Growth: Growth that proceeds from the apex towards the base.
Cambial Activity: The growth of vascular tissues (xylem and phloem) from the vascular cambium.
Compartmentalization of Decay: A tree's natural process of limiting the spread of decay and disease.