Flashcards in Plants Deck (11)
How do you know how old a woody plant is?
The scale scars of a stem mark the locations of previous apical buds. The distance between two sets of scale scars represent one year of growth.
What are sessile leaves?
Leaves that do not have a petiole (i.e. they are joined directly to the stem)
What parts of a leaf contain the vascular tissue?
The petiole, midrib and veins
What type of venation occurs in monocots?
What type of venation occurs in dicots?
Why is xylem a dead tissue?
The living contents of tracheids and vessels die before they reach maturity
What is lignin?
Lignin is a strengthening material found in some plant cell walls. Lignified xylem forms the wood in trees.
Why is phloem a living tissue?
Phloem is composed of sieve tubes and companion cells. As companion cells are alive, phloem is a living tissue.
A seed leaf
Have one cotyledon in the seed (one seed leaf)