Unit 3
No description yet. This curated deck is ready for daily study.
Card preview (24)
What factors may increase or decrease biodiversity?
Human activities Biotic factor Abiotic factor
What is biodiversity?
Biodiversity is the total variation that exists amoung all living things on earth
What are the Biotic Factors?
Living factors including: Competition Disease Predation Grazing Good availability
What are Abiotic factors?
Non-living factors including: Temperature pH Light intensity Moisture
What is predation?
Predation is the feeding of one organism on another.
What is a niche?
A niche is a role that an organism plays in a community. It includes: Use of resources Interaction with other organisms (competition)
What is an ecosystem?
An ecosystem consists of all living organisms in a particular area and the non-living components with which the organisms interact
Describe what is meant by ‘population’
The number of one type of living organisms in an area
Describe what is meant by a ‘community’
The number of different types of living organisms in an area
What is meant by the term ‘species’
A species is a group of organisms which can interbreed to produce fertile offspring
What is at the beginning of a food chain and why?
Producers because they can make their own food (self-dependant)
What do plants compete for?
Soil nutrients Sunlight Water
What do animals compete for?
Water Shelter Mates Territories Food
What is the deference between inter-specific and intra-specific?
inter specific competition is competition between all living organisms as they require similar resources Intra specific competition is competition between specific living organisms as they require the same resources therefore making it more intense
What is a mutation?
A mutation is a permanent change in the DNA of an organism that occurs randomly
What is this chromosome XX
Female
What is this chromosome XY
Male
How does variation occur?
Overtime advantageous mutations result in variation within a population
What do the arrows represent on a food chain?
The flow of energy
How much energy is lost in ecosystems and why?
90% of energy is lost as heat, movement or undigested material
Why is nitrogen requires in the nitrogen cycle?
Nitrogen (N2) is required to make protines
What is nitrification?
Ammonium compounds are converted into nitrites and then nitrates
What is denitrification?
Bacteria breaks down nitrates in the solid and releases nitrogen into the air
What is nitrogen fixation?
Soil bacteria absorb nitrogen from the air and ‘fix’ it onto ammonium compounds and then into nitrites