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Biology
Organisms and Populations
90 questions from 35 papers, each with its answer.
- 90 questions
- 35 papers
- 2.55% of Biology
Population Interactions – Amensalism
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Which one of the following population interactions is widely used in medical science for the production of antibiotics?
Antibiotic production is amensalism: one harmed, the other unaffected.
Amensalism/antibiosis (0, –). Antibiotics are chemicals secreted by one microbial group (e.g. $Penicillium$) which harm other microbes (e.g. $Staphylococcus$). It has no effect on $Penicillium$, the organism which produces it.
Population interactions – mutualism
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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
$Yucca$ and the moth $Pronuba$ are obligate mutualists.
$Yucca$ has an obligate mutualism with a species of moth, i.e. $Pronuba$.
Population attributes – natality
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Natality refers to
Natality = birth rate.
Natality refers to birth rate. Death rate – mortality; number of individuals entering a habitat – immigration; number of individuals leaving the habitat – emigration.
Ecological niche
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Niche is
Niche is the functional role of an organism in its habitat.
The term ecological niche was coined by J. Grinnell. It refers to the functional role played by the organism where it lives.
Population attributes – age pyramids
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In a growing population of a country,
An expanding population has a broad pre-reproductive base.
Whenever the pre-reproductive individuals, i.e. the younger population, are larger in number than the reproductive group, the population will be an increasing population.
That is every question in Organisms and Populations for this filter.
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