1TTO review B3: stems+ start b4: leaves

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Lesson plan 01-01

-Questions about b3: stems

-Discuss homework ex. 8, 9 ,11

-Discuss b4: leaves

State a function of stems:

Summer wood and spring wood:

1. Summer wood is dark. Spring wood is light.
2. Summer wood is light. Spring wood is dark.

Summer wood and spring wood:

1. Summer wood is late wood. Spring wood is early wood.
2. Summer wood is early wood. Spring wood is late wood.

Describe vascular bundles:

B3: Stems

Trees:-Have annual rings (jaarringen).

-Annual rings have a light and a dark part.

Dark: made in summer (late wood)

Light: Made in spring (early wood)

B3: Stems

Annual rings:  information about the (changing) environment of the plant.

-Fire/Damage

-Amount of rain: Drought(droogte) or lots of rain.

Discuss homework b3: stems

-Do assignments 8, 9, 11

B4: leaves

-Catch sunlight.

-Can take in and release CO2 (carbon dioxide) and O2 (oxygen) through stomata

-Contain lots of chloroplasts for photosynthesis.

B4: leaves

Consist  of:

-Stalk (bladsteel): attached to stem.

-Leaf blade (bladschijf): veins/ vascular bundels and lamina.

-Lamina(blad moes) with chloroplasts