Transport in Plants

Question 1

Uptake of water by the root hair cell

Answer 1

Osmosis

Question 2

Water movement through the root

Answer 2

Osmosis
Pathways

Question 3

Pathway where water moves cell to cell via cell to cell

Answer 3

Apoplast

Question 4

Pathway where water moves cell to cell via the cytoplasm and through plasmodesmata

Answer 4

Symplast

Question 5

Pathway where water moves trough vacuole

Answer 5

Vacoula

Question 6

Water movement up the xylem into the root and stem

Answer 6

Transpiration
Root pressure
Transpiration pull
Properties of water

Question 7

Explain cohesion

Answer 7

tendency of water molecules to attract one another

Question 8

Explain adhesion

Answer 8

tendency of water molecules to be attracted to molecules of different types

Question 9

Water movement through the leaf

Answer 9

Osmosis
Diffusion

Question 10

Define transpiration

Answer 10

loss of water vapor from plant leaves by evaporation of water of the surfaces of mesophyll cells followed diffusion of water vapor through the stomata

Question 11

Examples of Xerophytes in Namibia

Answer 11

Quiver tree
Euphorbia
Nara plant
Baobab tree

Question 12

How do Xerophytes reduce waterloss

Answer 12

Reduced stomata
Sunken stomata
Surface has hair to trap water vapor
Smaller leaves= smaller surface area
Thorns= reduce surface area
Thick cuticle reflect light

Question 13

Conditions that affects the rate of transpiration

Answer 13

Temperature
Wind
Humidity
Light intensity

Question 14

How and why does wilting occur

Answer 14

Rate of water loss is greater than the absorption of water
Soil lacks water
Shortage of water

Question 15

Define translocation

Answer 15

The transport of organic molecules (sucrose+ amino acids) in the phloem from a region of production (leaves) to regions of utilization or demand in respiration or growth (flowers+ roots)

Question 16

Translocation of pesticides

Answer 16

Sprayed onto the leaves, absorbed through the cuticle/ stomata into the phloem tubes.
Plant sucking pest suck poisonous sap from the phloem.

Question 17

Companion cells are:

Answer 17

Living cells
Contain cytoplasm, a nucleus, and mitochondria
Metabolically active cells

Question 18

Phloem sieve tubes are:

Answer 18

Living cells contain cytoplasm and organelles
Tubes are connected end to end for easy flow
Organelles are at the edge to give more space for movement
Have end wall with sieve plates

Question 19

Xylem cells are:

Answer 19

Dead hollow cells
Elongated cells arranged end to end to form tubes for transport
No end wall for minimum resistance
No organelles to obstruct flow
Large lumen allows unrestricted flow
Cellulose lining for adhesion

Question 20

Function of the epidermis

Answer 20

protects the tissue

Question 21

Function of the endodermis

Answer 21

regulates the passage of water

Question 22

Function of the cortex

Answer 22

stores starch