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    Plant Population Frequency

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    Prince Kumar
    This document describes an experiment to study plant population frequency using the quadrat method. Students are instructed to select a field and divide it into four 1m x 1m quadrats. They will count and record the number of different plant varieties in each quadrat and calculate the average population density for each variety. The quadrat method allows students to systematically study the distribution and density of plant populations in a given area.

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    Plant Population Frequency

    Uploaded by

    Prince Kumar
    451 views2 pages
    This document describes an experiment to study plant population frequency using the quadrat method. Students are instructed to select a field and divide it into four 1m x 1m quadrats. They will count and record the number of different plant varieties in each quadrat and calculate the average population density for each variety. The quadrat method allows students to systematically study the distribution and density of plant populations in a given area.

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    To study plant population frequency

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    Plant population frequency

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    This document describes an experiment to study plant population frequency using the quadrat method. Students are instructed to select a field and divide it into four 1m x 1m quadrats. They will count and record the number of different plant varieties in each quadrat and calculate the average population density for each variety. The quadrat method allows students to systematically study the distribution and density of plant populations in a given area.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    451 views2 pages

    Plant Population Frequency

    Uploaded by

    Prince Kumar
    This document describes an experiment to study plant population frequency using the quadrat method. Students are instructed to select a field and divide it into four 1m x 1m quadrats. They will count and record the number of different plant varieties in each quadrat and calculate the average population density for each variety. The quadrat method allows students to systematically study the distribution and density of plant populations in a given area.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    EXPERIMENT6

    Plant Population Frequency


    of Different Plants
    Plant Population Frequency
    To Study the Species"-By Quadrat Method

    AIM
    method.
    frequency by quadrat
    To study the plant population
    YOU NEED Materials required
    Hammer, (5) Measuring tape, (6) Noting pad/paper.
    (1) Metre scale, (2) String, (3) Nails, (4)

    HOW TO DO IT

    1. Select a good growing/cultivated field/parkgrassland and set the field for study.
    or

    Follow the same method of making the quadrats.


    Make four quadrats of size mx1m area each.
    2.
    3. Note your observation and data in the observation table and write comments in your practical record fl

    1 metre 1 metre

    Nail
    String

    1 metreoenlt o

    1 metre

    -String 2

    1 metre
    1 metre

    1 metre

    metre

    "suggested Plants outside the


    quadrat area
    (a) Weeds
    (amaranthus,
    convolvulus, wild oat, chenopodium,
    grass)
    and a main
    Plant
    Variety No. 1. Total No in quadra
    1-12
    crop plant. t 1-10
    Plant Variety No. 2. Total No in quadrat
    (b) Weeds and crop
    Multiple croppingplants
    in field. a t1 - 1 /

    (c) Plant Variety No. 3. Total Noin quadrat


    crops. t 1-08

    Plant Variety No. 4. Total No in quadrat


    Fig. 6.1 Study of plant population
    Saraswati Lab Manual
    Biology-XII
    OBSERVATION TABLE/DATA
    Density of different plant species in_ name of area studied)
    Name of plant
    S. No. of plants
    No. species in quadrats Total No. of quadrats Average
    plants in which species population
    Occurred density
    e.g. Amaranthus 0
    Cynodon

    5
    Note: Number of quadrats can be increased as
    per requirement.
    Calculation of population
    density= Total number of plants of a species
    Total number of quadrats
    COMMENTS AND CONCLUSIONS
    1. From the quadrat study of the selected
    field/park/grassland area there are no. of plant species.
    2. The average population density of plants of_
    species is highest and of. species it is lowest.
    3. This means that this soil (selected area) is suitable for the
    growth species.
    4. species of plant is dominant over other species studied.
    Precautions
    BE CAREFUL
    1. Select a
    good/wildly growing/cultivated area. s i
    2. Carefully count the plants. Do not make a mistake to recount the plants. (It will give wrong results.)
    3. Select one species of plant population for
    counting at one time.
    4. Plants coming under the string can be avoided.
    5. Note the data immediately in the observation table.

    Note: The above survey/study can be repeated during different seasons of the year for interesting data.
    1. Population is the group of individuals of a particular species in a particular area at a given specific time. It is of two
    types:
    (a) Mono specific population. The population of individuals of only one type of species.
    (6) Mixed or poly specific population. The population of more than one species. It is also called a community.
    2. The study of individuals of the same species where process such as interdependence etc., and factors governing, it is
    studied/considered is called population ecology.
    3. The method adopted to study here is the crude density. It is the density (number or biomass) per unit total space.
    4. Population density increases only by natality (birth rate) or immigration and decreased by mortality (death rate) or
    emigration. Some factors may be density dependent (eg., competition and predation) or density independent.
    5. There are three different phyto sociological methods for recording various species of the community.
    By taking any sampling unit like quadrat, transect and point.
    6. In Quadrat method the sampling unit is definite area which can be in the form of a square, a rectangle or a circle.

    O O
    OO O
    OOO
    B. Quadrats C. Transects
    A. Circular
    Fig. 6.2 Sampling methods

    Saraswati Lab Manual Biology-XII 31

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