Chapter 9 Keywords Flashcards Preview

A Biological Processes PM June 12th 2017 > Chapter 9 Keywords > Flashcards

Flashcards in Chapter 9 Keywords Deck (15)
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1
Q

dicots - dicotyledonous plants

A

make seeds that contain two cotyledons. there are two types, herbaceous and arborescent

2
Q

cotyledons

A

organs that act as food stores for the developing embryo plant and form the first leaves when the seed germinates

3
Q

herbaceous dicotyledonous plants

A

soft tissue
relatively short life cycle
*leaves and stems die down at the end of each growing season

4
Q

arborescent dicotyledonous plants

A

hard lignified tissue

long life cycles

5
Q

vascular system

A

series of transport vessels running though the stems roots and leaves

6
Q

turgor pressure

A
  • result of osmosis in the plant cells
  • provides hydrostatic skeleton to support the stems and leaves
  • drives cell expansion enabling plant roots to force their way through tarmac and concrete
7
Q

root hair

A

long thin extensions from a root hair cell

8
Q

root hair cell

A

specialised epidermal cell found near the growing root tip

9
Q

guttation

A

evidence of root pressure independent of transpiration

xylem sap exudes from the cut ends of the stems at certain times,
in nature, xylem sap forces out of special pores at the end of the leaves in some conditions eg overnight when transpiration is low

10
Q

transpiration

A

the loss of water vapour from the leaves and stems of the plant. an inevitable consequence of gas ex

11
Q

relative humidity

A

the measure of the amount of water vapour in the air compared to the total concentration water the air can hold

12
Q

tranlocation

A

the transport of organic compounds from the sources to the sinks. an active process that requires energy to occur. bidirectional

13
Q

xerophytes

A

plants that live in dry habitats that have evolved a wide range of adaptations that enable them to live and reproduce in places where water availability is very low indeed.
live in cold icy conditions or hot dry and breezy places

14
Q

rhizomes

A

modified stems

15
Q

hydrophytes

A

plants that live in water (surface/submerged/edge of bodies of water)