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Lecture 8

BSC 196 Lecture Notes - Lecture 8: Transpiration, Thigmotropism, Eudicots

Biological Sciences
Course Code
BSC 196

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Plant cells have cell walls made of cellulose.
Provides support and structure for the plant.
Plasmodesmata: intercellular channels, allow for communication between cells.
Vacuole: stores water, waste, pigments, etc.
When full, maintains turgor (keeps plant upright).
Plastids are organelles that include chloroplasts and chromoplasts.
Contain photosynthetic pigments
The color that we see is the wavelength of light reflected.
Different colors are absorbed at different wavelengths.
Vital for efficient photosynthesis
Chlorophyll (in chloroplasts)
Green in color, functions in photosynthesis
Carotenoids (in chromoplasts)
Red, orange, and yellow in color
Function in photosynthesis and protection (antioxidants)
Anthocyanin (in vacuole)
Blue or purple in color
Function in protection from UV light damage
Movement of water from roots to shoots.
Water moves against gravity due to the process of cohesion-adhesion-tension.
Properties of water allow this.
Water molecules stick to each other and to xylem walls due to hydrogen bonds.
Differential pressure is needed.
More negative pressure at top of plant.
Mediated by stomata.
Evaporation initiates transpiration.
When wilted plants are watered, this water movement revives them.
Plants must adjust to abiotic stimuli (light, water, temp.)
Phototropism: a plant bends its stem toward light.
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