Final Multiple choice (HW 10)
Which of the following statements about the vascular tissue system is not true?
four cell types occur in phloem; sieve tube members, companion cells, tracheids and vessel elements
Most of the plant body consists of the ___________ tissue system
ground
The older, darker wood in the center of a tree trunk is commonly called
heartwood
Axillary buds are located
in the upper angle between a leaf and the stem to which it is attached
Root hairs
increase the absorptive capacity of roots
If you were to relocate the pericycle of a plant root to the epidermal layer, how would it affect root growth
lateral roots would grow from the outer region of the root and fail to connect with the vascular tissue
The photosynthetic ground tissue in the middle of the leaf is called
mesophyll
Roots differ from stems because roots lack
nodes
Sieve tube members are part of the
phloem
Many vegetables are grown today through hydroponics, in which the plant roots exist primarily in an aqueous solution. Which of the following root structures is no longer beneficial in hydroponics?
root cap
Sclereids and fibers are examples of which plant tissue?
sclerenchyma
Each annual ring in a section of wood represents 1 year's growth of
secondary xylem
One main root, formed from the enlarging embryonic root, with many smaller lateral roots branching off it is a(n)
storage root system
Which dicot leaf tissues display the greatest amount of air space?
the spongy parenchyma
How do tracheids differ from vessel elements, in addition to their overall shape?
tracheids have only one type of passageway to allow movement of water from cell to cell, called a pit
The two lateral meristems responsible for secondary growth are the
vascular cambium and cork cambium
The center of a herbaceous eudicot root is composed of ______, whereas the center of a monocot root is composed of _________.
xylem; pith
The function of the ______ causes leaves to shed in the fall
abscission zone
The two simple tissues that are specialized for support are
collenchyma and sclerenchyma
The noncellular waxy layer secreted by the epidermis over its aerial (shoot) surface is called
cuticle