Practice question · Select all that apply
Which statements about secondary growth are correct?
Hints
- Three describe thickening; one confuses it with primary growth.
- Secondary growth adds girth, never length.
Show the answer
- A. Growth rings arise from seasonal differences in xylem
- B. It is produced by lateral meristems
- C. The vascular cambium adds xylem inward and phloem outward
Why
Secondary growth thickens the stem: the vascular cambium lays down xylem inward and phloem outward, and seasonal variation in that xylem produces visible rings. Length comes only from apical meristems.
Practise Plant Meristems and Covering Tissues
The app has 4 more questions on this lesson, and keeps your place in the course. Biology I is free to start.
More questions on Plant Meristems and Covering Tissues
- Why does a nail driven into a tree trunk stay at the same height for decades?
- Sort each meristem by what it adds to the plant.
- A grass plant is mown, removing the top of every leaf. Set the fraction of its growing capacity that is lost,…
- The waxy cuticle covering a leaf is perforated by stomata.
- A root tip is described as 'a spatial record of a temporal process'. What does this distinction imply about…
- A CAM desert plant is running its daily cycle. Arrange these events in the order they occur, starting at dusk.