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CSS :: Population Biotic Community


11.  The vertical layering of organisms corresponds to:
A. Stratification B. Dominance
C. Physiognomy D. Diversity

12.  The keystone species are those which exhibit:
A. Low abundance, little influence B. High abundance, little influence
C. Low abundance, high influence D. High abundance, high influence

13.  The mycorrhizae present in association with higher plant roots are best described as:
A. Keystone species B. Edge species
C. Critical link species D. Edaphic pod species

14.  The number of individuals of a species per sampling unit is called its:
A. Biomass B. Abundance
C. Density D. Frequency

15.  The number of sampling units expressed in percentage in which a particular species occurs is called its:
A. Abundance B. Density
C. Frequency D. Phenology

16.  The earliest settlers on barren lands generally are:
A. Diatoms B. Ferns
C. Mosses D. Lichens

17.  When the vegetation of any region reaches climatic climax, it is:
A. Lithophytic B. Xerophytic
C. Mesophytic D. Hydrophytic

18.  The herb stage in a lithosere is immediately followed by plants like:
A. Potantilla B. Zizyphus
C. Umbilicaria D. Grimmia

19.  The last community in a succession is called:
A. Ecosystem B. Climatic community
C. Ecotons D. Seral community

20.  Many forested regions of today were once barren rock areas. Mot likely this change involved the following sequence of stages:
A. Lichens-mosses-annual herbs-wood shrubs B. Annual herb-weedy shrubs-lichens-mosses
C. Woody shrubs-mosses-lichens-annual herbs D. Mosses-annual herbs-woody shrubs-lichens




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