Softwood is the wood of conifers.

Tracheids are thought to direct the activities of sieve tube members, which lack their own nuclei.

Pores that facilitate the diffusion of carbon dioxide into leaves or herbaceous stems are 

Match each structure with its description.

Springwood xylem has larger diameter cells than summerwood xylem.

Secondary growth occurs as a result of the activity of the

Photosynthesis occurs in the leaf’s

The lower pressure at a sink occurs due to an increase in water potential in the sieve tube elements.

The environmental trigger for the opening of stomata is a high water concentration in the mesophyll.

The level of testosterone in the blood is increased by