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BIOL 111 Study Guide - Final Guide: Etiolation, Transpiration, Burette

Biology (Sci)
Course Code
BIOL 111
Suzanne Gray
Study Guide

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LAB 3: Plants on Land
Types of Species:
Alien or exotic species: introduced to a region beyond their native range (originated
from a different country/region)
Considered to be a problem because their proliferation is occurring at an
alarming rate and because they can have serious effect on native taxa
Invasive species: colonize and disperse rapidly
Native or endemic species: originally present in a region
Anthriscus sylvestric came from Eurasia and is found in moderately disturbed
habitats (require moist or wet sites)
How can the negatively affect ecosystems?
Displace vegetation
Release chemicals that may affect other plants ability to colonize
Fed upon cattle = low nutrition = reduce milk production
Quantify the abundance of Plants:
Transects: straight line marked along the ground to define where sampling will be
Quadrats: circular/square areas that are delineated and used to define the area in
which the plant community will be quantified
Plant Hormones and Growth Regulation:
A terrestrial existence requires a plant to respond to the environment
Plants respond by modifying how they grow (growth regulation)
Hormones regulate many responses
Indolacetic acid (IAA) found in a group of hormones called auxins: increase the
size of cells formed from the apical meristem
Plant growth is controlled by variation of IAA levels
Apical Dominance and Growth Hormones:
Apical dominance: the suppression of lateral branches that normally appear from
lateral buds located in leaf axils. This suppression results from a high level of IAA in the
growing tip of the stem
Effect of Gibberellin:
Gibberellin: effects on seed germination and stem growth, promote cell elongation and
cell division
Do gibberellin and IAA have the same effects?
No. The application of Gibberellins on dwarf plants promotes stem elongation so
that the dwarf plants are close in size to normal plants. (Normal plants are
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