Exam (elaborations)
BIOL325 Unit 3 Questions answers latest update
- Course
- BIOL325
- Institution
- University Of Richmond
BIOL325 Unit 3 Questions answers latest update
[Show more]
Content preview
BIOL325 Unit 3What are examples of plant facilitation? - - wind breaking
- soil moisture retention
- cover improves physical characteristics of soil
- increased nutrients & soil oxygenation
- decreased evaporation & soil salinity
- volatile compounds warn neighbors of herbivory
How can intercropping benefit plants? - - different heights accommodate different
light requirements
- differing root distributions minimize competition for nutrients
- ground hugging plants suppress weeds
Competition - a reduction of growth & fitness by one individual interacting with
their resources
Asymmetric competition - occurs when one species suffers a much greater fitness
decline than the other (disproportionate to plant size)
What is an indicator of vegetative shading? - a low ratio of red:far-red light
Sun: both R & FR
,Shade: More FR (red light is depleted as light moves through the canopy)
What are the 3 responses to aboveground & belowground competition? - 1.
confront (elongate)
2. avoid (grow away from)
3. tolerate (shade tolerant physiology)
What characterizes belowground root competition? - - root plasticity
- self vs nonself recognition
- allelopathy
How is root growth plastic? - When soil resources are abundant, plant allocate
less biomass to roots; when nutrients are patchy, roots proliferate in nutrient rich
patches
competitive exclusion principle - Ecological rule that states that no two species
can occupy the same exact niche in the same habitat at the same time
1 will win 1 will lose
Is interspecific or intraspecific competition more intense? Why? - Intraspecific
competition is more intense due to having similar nutrient, light, and water
requirements, while interspecific competitors may 'complement' eachother
, What is the self thinning & -3/2 rule? - A progressive decline in the density of a
population of growing plants. During the course of the self-thinning process,
individuals become larger as the population density declines. If the logarithm of
density is plotted against the logarithm of individual weight, then a straight line of
negative slope is obtained, and the slope is generally −3/2. This relationship holds
for a wide range of plants, from annual weeds to forest trees, and has become
known as the 'self-thinning rule'.
allelopathy - The production of chemicals by plants that inhibit the growth of
neighbouring plants
- type of interference competition
How do common mycorrhizal networks increase size inequalities? - As a result of
asymmetric competition, large plants further benefitted by the CMN dominant,
and suppress other plants
Genet - a genetic individual that arises from a single fertilized egg
ramet - a physiologically distinct individual in a plant population
apomixis - The ability of some plant species to reproduce asexually through seeds
without fertilization by a male gamete.
Stolon - a horizontal branch from the base of plant that produces new plants;
generates ramets at nodes touching the ground
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Schoolflix. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53340 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now