Download Test 2 Study Guide

Test 2 Study Guide
Lecture 7 Objectives
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Know what the suspensor is and what its function is
o The suspensor delivers nutrients from the ovule to the embryo
● Know the parts of the angiosperm embryo (root and shoot apical meristems, hypocotyl,
cotyledons, vascular tissue, ground tissue, epidermis)
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Apical meristems- tips of all shoots and roots and are composed of cells that are
capable of repeated division
Cotyledon- seed leaf; generally absorbs food in monocotyledons and stores food in
other angiosperms
Hypocotyl- provides root shoot access
3 types of tissues that form in the embryo:
▪ Epidermis- outermost layer of cells of the lead and young stems and roots
▪ Vascular tissue- any plant tissue
● Xylem- most of the water and minerals of a plant are conducted;
presence of 2 types of cells: tracheids- small, vessel elements- large.
Water and mineral transport and support is driven by evaporation of
water, tracheids and vessels dead at maturity, evapotranspiration
powers water movement. Vessel elements are short and wide with
open walls whereas tracheids are long and tapering with water
movement through the pits on the sides
o Tracheids- elongated and tapering with water movements
through the pits on the sides, thick walled conducting and
supporting cell of xylem (has tapering ends and pitted walls
without perforation)
o Vessel element- tube like structure with elongated cells
connected through perforations. Function is to conduct water
and minerals through the plant body
● Phloem- the food conducting tissue of vascular plants. Sugar and amino
acid transport. 2 types of cells: sieve tube elements, companion cells.