Root apical meristem

Growth  occurs  just  behind  the  tip  in  three  overlapping  zones  of  cells at  successive  stages of  primary  growth.  These  are  the  zones  of  cell  division,  elongation, and differentiation

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#XL - T Zoology

Baited snap traps, Population density can thus be estimated as the number of animals caught per trap or per unit area where a given number of traps are set.

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The mark-recapture technique is that after the tagged animals are released, they mix freely with unmarked individuals. The population is resampled and the numbers of marked and unmarked individuals are recorded. 

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#XL - T Zoology

TLS Online TPP Program

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#XL - T Zoology

Mark-recapture technique can have drawbacks;

1. Some animals that have been marked may learn to avoid the traps. 
2. Recapture rates will then be low, resulting in an overestimate of population size.

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#XL - T Zoology

Some animals can become trap-happy, particularly if the traps are baited with food. This would result in an underestimate of the population size.

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#XL - T Zoology

Clumped: The most common dispersion pattern is clumped, because resources tend to be clustered in nature.