Plants Flashcards
What happens when xylem cells mature?
They add lignin to their walls
What happens to the xylem cell when it lignifies?
- they die
- it makes the cells waterproof
- it makes the cells stronger and able to withstand water pressure
Where are xylem and phloem located in leaves?
The phloem is on the lower surface
The xylem is on the upper surface
Where are xylem and phloem located in roots?
The vascular bundles are in the center of the root, xylem on the inside, phloem on the outside
Where are xylem and phloem located in stems?
The vascular bundles are arranged in a circle around the center. the xylem is in the middle and the phloem is on the edge.
What is the top layer of a leaf?
Waxy cuticle
What is the third-to-top layer of a leaf?
Palisade mesophyll
What is the third-to-bottom layer of a leaf?
spongy mesophyll+air space+ vascular bundle
What is the third-to-top layer of a leaf?
palisade mesophyll
What is the second-to-bottom layer of a leaf?
lower epidermis
What is the bottom layer of a leaf?
cuticle
Which layer of a leaf has the most chloroplasts?
Palisade mesophyll
What type of growth does the apical meristem cause and where is it found?
Primary growth (lengthening), found in tips of roots and shoot, makes new plants and leaves
What type of growth does the cateral meristem cause and where is it found?
Secondary growth (widening), found in cambium, produces bark on trees
What is the purpose of the flower?
reproduction