Lecture 12 Flashcards Preview

Biol 1010 > Lecture 12 > Flashcards

Flashcards in Lecture 12 Deck (18)
Loading flashcards...
1
Q

Indeterminate growth

A

most plants experience this and means that they continue to grow for the duration of their life. allows plants more exposure to sunlight, soil, and air

2
Q

Angiosperms characterized according to life cycle duration

A
  • annuals
  • biennials
  • perennials
3
Q

Annuals

A

complete lifecycle in one year of less (crops)

4
Q

Biennials

A

complete lifecycle in 2 years (beets/carrots)

5
Q

Perennials

A

live and reproductive for many years (trees/shrubs)

6
Q

Plant growth made possible by tissues called..

A

meristems

7
Q

Meristems

A

consist of cells that divide frequently generating more cells. some of these new cells remain in the meristem and continue to divide while other differentiate being incorporated into the tissue of plant

8
Q

Apical meristems

A

located at tips of roots and buds of shoot. enables roots to push through the soil and shoots to increase exposure to life/CO2

9
Q

Primary growth

A

cell division here produces new cells allowing the plant to grow in length

10
Q

Root cap

A

tip of root covered by this which protects the cells of the apical meristem which are actively dividing

11
Q

Growth in length occurs just behind the root tip with 3 areas of distinct cells

A
  • zone of cell division
  • zone of elongation
  • zone of maturation
12
Q

Zone of cell division

A

contains the cells of the root apical meristem and cells that derive from it. new cells of the root are produced here (root cap cells)

13
Q

Zone of elongation

A

root cells here elongate (10x). pushes the root tip hurter into soil, cells lengthen and don’t expand because cellulose finer arrangement, cells take up water and the cellulose fibres separate expanding like an accordion

14
Q

Zone of differentiation

A

all 3 plant tissues complete their development here. cells in the vascular cylinder differentiate into primary xylem and primary phloem. occurs because of differential gene expression

15
Q

Secondary growth

A

woody plants continue to grow in girth once primary growth is complete

16
Q

Lateral meristems

A

secondary growth occurs because of activity in these stems. arranged into cylinders called vascular cambium and cork cambium

17
Q

Vascular cambrium

A

cylinder of meristem cells one cell thick between the primary xylem and primary phloem

18
Q

Secondary growth adds..

A

layers of vascular tissue on either side of the vascular cambrium