Question

plant
petunia
lilly
upper epidermis
lower epidermis
upper epidermis
lower epidermis
number of
stomata
6
11
50
48
number of
epidermal cells
~70
~60
~55
~60
stomata index
(show the
calculation and the
answer)
monocot or dicot?

Explanation:

Step1: Formula for Stomata Index

Stomata Index \( SI=\frac{S}{S + E}\times100\), where \(S\) is number of stomata and \(E\) is number of epidermal cells.

Step2: Petunia Upper Epidermis

\(S = 6\), \(E\approx70\). \(SI=\frac{6}{6 + 70}\times100=\frac{6}{76}\times100\approx7.89\)

Step3: Petunia Lower Epidermis

\(S = 11\), \(E\approx60\). \(SI=\frac{11}{11+60}\times100=\frac{11}{71}\times100\approx15.49\)

Step4: Lilly Upper Epidermis

\(S = 50\), \(E\approx55\). \(SI=\frac{50}{50 + 55}\times100=\frac{50}{105}\times100\approx47.62\)

Step5: Lilly Lower Epidermis

\(S = 48\), \(E\approx60\). \(SI=\frac{48}{48+60}\times100=\frac{48}{108}\times100\approx44.44\)

Step6: Monocot or Dicot

Petunia: Dicot (usually have more stomata on lower epidermis). Lilly: Monocot (stomata distribution more even, but Lilly is a monocot plant species)

Answer:

Plant	Petunia - Upper Epidermis	Petunia - Lower Epidermis	Lilly - Upper Epidermis	Lilly - Lower Epidermis
Monocot or Dicot	Dicot	Dicot	Monocot	Monocot