Class Notes (808,754)
Canada (493,378)
BIOL 1010 (75)
Lecture 63

BIOL 1010 Lecture 63: Lecture 63

3 Pages
Unlock Document

University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

o982 Bio 1010 dividing cells are arranged into two cylinders known as the vascular cambium.
- The Vascular Cambium is a one cell thick meristem between the primary xylem and primary phloem.
- Tissues produced by secondary growth are known as secondary tissues.
- Vascular Cambium, forms secondary phloem towards the stems surface and secondary xylem {wood} towards the stems center. The Vascular cambium makes xylem and phloem by dividing its cells repeatedly.
- Woody stems get thicker and thicker as they age.
- Annual growth rings result from the layering of secondary xylem.
- External to the vascular cambium the tissues do not accumulate over the years, but rather are sloughed off at the same rate they are produced.
- Secondary growth also adds cork that insulates and waterproofs stems and roots. Cork is made by one or more lateral meristems called cork cambiums, which is formed from Parenchyma cells in the cortex.
- Everything external to the Vascular cambium is called Bark
- Barks main component is secondary phloem, cork cambium, and the cork.
- To maintain itself the VC alternates between making Xylem and Phloem. After each division once cell stays meristematic while the other differentiates, acquiring the features of a xylem of phloem cell. More divisions create xylem than phloem, that is why the wood (secondary Xylem) is thicker than bark (Secondary phloem and cork)
More Less

Related notes for BIOL 1010

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.