HS 201 Exam 3

Light Duration

Number of continuous hours of light in a 24 hour period

Light Quantity

Number of light particles

Light Quality

Spectral distribution of light emitted from a light source

Carotene

Orange pigment

Xanthophyll

Yellow pigment

Chlorophyll

Green Pigment

Anthocyanin

Red pigment

Auxin

Hormone produced at stem tip

Light Compensation Point

Rate of photosynthesis = rate of respiration

Light Saturation Point

Amount of light beyond which no benefit is gained

Shade Leaf Chracteristics

Larger, thinner, greener, lower LCP, more efficient photosynthesis

Sun Leaves

Smaller, thicker, Higher LCP, Less efficient photosynthesis

Etiolation

Plant grown in partial or full absence of light

Blanching

Growing technique to exclude light

What stimulates fall color?

Decreasing day length + Temperatures

Abscission Zone

Zone of the petiole that separates from the branch during fall

Amount of sugar produced by photosynthesis annually

100 Billion tons

Amount of dry matter in plants from photosynthesis

94%

Amount of light that hits a leaf that is used during photosynthesis

1%

Only classes that produce seeds

Angiosperm + Gymnosperm

Parts of a seed

Seed coat, Endosperm, Embryo, Cotyledon, Radicle

Gravitropism

plant’s response to gravity

Thigmotropism

Plant’s response to movement

Heading back

Reducing the entire plant size

Thinning

Selectively reducing density

Remontant plant

Plant that blooms more than once per year

Cation Exchange Capacity (CEC)

Soil’s ability to hold and exchange positively charged ions on its surface

Infiltration

Water moves into soil from surface, moves down

Leaching

water moves through the soil beyond rootzone

3 tricky “soilless” Media

Growing media, Potting mix, and POTTING SOIL

Soilless Media

Any material or combination of materials used to grow plants in containers