Plant Gas Exchange Transport Support Transpiration

Question 1

Major elements

Usage

Answer 1

N - protein
P - nucleic acid
K - promotes photosynthesis
Mg - chlorophyll

Question 2

Trace element

Answer 2

Cu
Zn
Co

Question 3

Main site of gas exchange

Also where

Answer 3

Leaves

Stem - herbaceous - stomata
- woody plants - lenticels

Roots - no cuticle - all surface

Stem root no photosynthesis

Question 4

Leaf structure

Answer 4

Leaf blade Midrib Leaf blade

Cuticle - reduce water loss
Upper epidermis - no chloroplast

Palisade mesophyll - tightly packed - chloro
Spongy mesophyll - irregular - less chloro
Air spaces - in spongy mesophyll

Lower epidermis - no chloro
Stoma - Gas exchange
Guard cells - chloro - controls opening and closing of stroma

Vascular bundle -Xylem + Phloem
Water minerals Food

Question 5

Gas exchange
In
Out

Answer 5

Gas diffuse in stoma
Dissolve in moist surface on spongy
Dissolve in spongy mesophyll to palisade

Gas produced diffuse to spongy
Diffuse to moist surface
Diffuce to air space
Diffuse out

Question 6

Leave adaptation for gas exchange ×6

Answer 6

Broad leaves - sueface area
Thin leaves - diffusion distance
Moist surface - diffusion
Air space - gas diffuse feeely
Stoma - allow diffusion
Guard cells - regulate rate of gas exchange

Question 7

CO2 exchange in plant

Answer 7

Respiration - constant rate
Photosynthesis - increase with light
No net change - Compensation point

Question 8

Different light intensity effects

Answer 8

Darkness - only respiration
Compensation point - same rate

High high high light intensity - no increase
Limited by other factors eg CO2