Questions and Answers

How is the supply of vascular cambium maintained?
– by the differentiation of apical meristem
– by the differentiation of secondary xylem
– by the division of its cells
– by the differentiation of cork
– by the differentiation of secondary phloem

What is the function of cork?
– regulating the opening and closing of stomata
– providing a site for photosynthesis
– providing cells for primary growth
– providing cells for secondary growth
– insulation and waterproofing

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?