CH 39 Plant Sensory Systems

CH 39 Plant Sensory Systems - absorbing substance and all...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
CH 39 Plant Sensory Systems 1. Preception and Processing of information a. Receptor cell perceives and external stimulus and tranduces to an internal signal b. A hormone released by one of the cells travels throughout the body c. Receptor cells receive the hormonal signal and change activity 2. Tropism a. Growth in response to movement b. Positive- movement towards a stimulus c. Negative- movement away from a stimulus d. Types of tropism- photo-light, gravitro-gravity, thigmo-touch e. Plants grow towards light, specifically shoots bend toward blue light, because phtosynthesis depends upon pigments and a pigment is a light
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: absorbing substance and all plants have cholorophyll a which absorbs blue light f. Accessory pigments are chlorophyll b which absorbs blue/green light and carotenoids which are anti-oxidant and protect cholorophyll molecules from light damage and are red, yellow and orange in color g. Chlorophyll a= 430 and 662 nm which are blue and red h. Phototropins detect blue light and initiate phototropic response i. Plants are sensitive to far red light over 710 mm because it indicates shade j. Species in light habits elongate stems in low light conditions k....
View Full Document

This note was uploaded on 04/07/2011 for the course BIOL 106 taught by Professor Allisonmiller during the Spring '11 term at Saint Louis.

Ask a homework question - tutors are online