Questions and Answers

Vascular cambium forms wood toward the stem’s _____ and secondary phloem toward the stem’s _____.
– surface … center
– center … center
– surface … surface
– top … bottom
– center … surface

____ provides cells for secondary growth.
– Vascular cambium
– Secondary phloem
– Secondary xylem
– Apical meristem
– The root

Secondary growth NEVER occurs in _____.
– leaves
– stems and leaves
– roots
– stems
– roots and leaves

How does carbon dioxide enter a leaf?
– CO2 is moved by active transport into the leaf by special cells called guard cells.
– CO2 passes through openings called stomata on the leaf surface.
– CO2 diffuses through the epidermal cells into the mesophyll.
– CO2 travels dissolved in the water in the xylem.
– Atmospheric pressure forces CO2 through pits on the leaf surface.

What is transpiration in the water cycle?

What is transpiration?

What is transpiration in plants?

What does transpiration mean?

How does transpiration work?

Where does transpiration occur?