3 Types of Plant Tissue

Question 1

(a) Dermal tissues: guard cell

Answer 1

control opening and closing of stomata and prevent excessive H2O loss

Question 2

parenchyma

Answer 2

thin

1. most common
2. w/ large vacoules
3. capable of division
4. alive at maturity
5. long live (up to 100yrs)

Question 3

Be able to identify and state the advantage and disadvantage of tracheids and vessels(–) State the functions of xylem(2)

Answer 3

1. TRACHEIDS: too narrow thus slow ( micas)

2. VESSELS ( goncha): faster bc wider and shorter + large perforation plates.

Question 4

State the functions of phloem(1)

Answer 4

transport water + nutrients// takes sugars down and around

Question 5

DT: Trichomes

Answer 5

make leaves hairy, deter herbivores form eating them

Question 6

DT: root hairs

Answer 6

increase SA to increase H2O + mineral ABS

Question 7

collenchyma

Answer 7

thin + some areas of secondary thickening

1. strong, flexible ( support w/o breaking when bent)
2. alive at maturity
3. long live
   - -> celery string
   - -> Petiole ( stalk)

Question 8

sclerenchyma

Answer 8

thick w/ lignin

1. dead at maturity
2. strong for structural support
   - -> hemp fibre sack
   - -> stem

Question 9

Dermal Tissue

Answer 9

1. covers all surfaces of plant body ( protects inner cells from environment)
2. 1 cell thick
3. covered by cuticle ( prevents excessive h2o loss + UV light filter)

Question 10

Variety F of Ground tissue

Answer 10

1. photosynthesis
2. storage
3. support
4. protection

Question 11

Xylem

Answer 11

take H2O and minerals up + provides structural support 2 IN ONE DEAL!!!

Question 12

How does xylem take water + nutrients up?

Answer 12

1. VESSEL: short and wide, h2o pass through rapid.
2. TRACHEIDS: narrow tapering, h2o pass pits thus slow passage.

• -> AS: has both
• -> GS: Tracheid

Question 13

Why xylem good at structural support?

Answer 13

LIGNIN EVOLUTION, lignin stronger in water conducting cells

M= only cellulose, F, GS, AS

Question 14

PHLOEM conducts food (sucrose) via???????

Answer 14

sieve tube elements that overlap end to end.

1. SIEVE PLATES: connect together
2. LIVING COMPANION CELLS: metabolic F + assists w/ adding sugars into sieve tubes