PLant Tissues Working Together

Question 1

Absorbing Light

Answer 1

Green, thin leaves are IDEAL for absorbing light (more surface area)
Chloroplasts are found in both SPONGY MESOPHYLL and PALISADE layer cells (ground tissue)
Most light absorbed in the PALISADE LAYER which is tightly packed, found just below upper part of leaf

Question 2

Obtaining CO2

Answer 2

Cells that make up epidermal tissue produce thin layer of wax called CUTICLE – keeps leaf from drying out AND prevents CO2 from diffusing in and out
Gases enter through STOMATA (leaf openings or pores) – found usually on bottom of leaves
Controlled by GUARD CELLS – can either open or close to control CO2 flow
CO2 is free to move in the SPONGY MESOPHYLL layer of the leaf

Question 3

Controlling Stomata

Answer 3

Stomata Open – CO2 allowed in, O2 out (but also allows water to escape)
If water levels are low, guard cells become soft and close the stomata, conserving water.
Guard cells also close at night when no light is present

Question 4

Obtaining water

Answer 4

Root hairs absorb water through OSMOSIS
Water travels through the XYLEM and PHLOEM vessels through TRANSPIRATION (water is able to adhere to surfaces & to itself)

Question 5

Comparing plant and animals

Answer 5

Both animal and plant cells use GLUCOSE to make ATP through CELLULAR RESPIRATION
Plant fluids move passively, animal fluids move due to muscular actions

Question 6

PLant systems and organs

Answer 6

Shoot system and root system

Organs: roots, stem, leaf, flower