Stems, leaves, roots and photosynthesis

Plant body

Modified stems/ Stolon

Modified stems/ Rhizome

Modified stems/ Tuber

Modified stems/ Bulb

Modified stems/ Corm

Leaf

• A leaf is a stem appendage with a bud in its axil

• Major function is as a photosynthetic organ

Leaf arrangement on stem

• Alternate• Opposite• whorled

• Blade• Petiole

• Leaf type– Simple – compound

A leaf is a stem appendage with a bud at its base.

Leaves

Leaf venation

• Parallel ( most monocots)

• Pinnate

• Palmate

• Net

• dichotomous

Parallel

Pinnate venation, simple leaf

Palmately divided, palmately veined

Palmate venation, simple leaf, crenate margin

Dichotomous

Palmate venation, simple blade, entire margin, peltate

Double pinnate compound leaf

palmately compound, pinnate veined

Specialized leaves

• Plantlets• Insectivory• Spines• tendrils

roots

FibrousTap

Photosynthesis/ Respiration

• Photosynthesis• 6CO2 + 6H2O+ sunlight+ green plant C6H12O6 + 6O2 + H2O• Carbon dioxide plus water plus sunlight and green plant yields sugar plus oxygen

plus water

• Cellular Respiration• C6H12O6 + 6O2 + 6H2O 6CO2+ 12H2O + 36 ATP

• Sugar plus oxygen plus water yields carbon dioxide plus water plus ATP

• Don’t worry about balancing the equations just know what happens on each side of the equation