Population

1. PRESENTED BY:-
ABINASH SONOWAL
CLASS:-B.SC 1ST SEM
ROLL NO:-16
HONOURS:-ZOOLOGY
YEAR:-2022-23

2.  A population is defined as a group individuals
of the same species living and interbreding
within in a given area . Members of a
population often rely on the same resources,
are subject to similar enviromental constraints
and depend on the availability of other
members to presist over time.
 There are two types of populations:-
a) Unitary population.
b) Modular population .

3. In unitary population , each individual is
derived from zygote ( the product of fertilization
of male and female gamete) and the growth of
such individuals is determinate and predictable .
In unitary organisms (most animals ) there is
usually no problem recognizing individuals ,
becaues they are both genetically and
physiologically separate.
Many species of plants and invertebrates
however, have vegetative propagation to produce
new individuals , besides sexual reproduction.

5.  In Modular populations individuals of these
populations exhibit variation in their
morphological features.
 Plants and few animals groups like sponges
and corals are examples of modular population
.In a plant population, no two individuals will
have the same number of brauches, leaves,
flowers or fruits.

7.  Unitary organisms –individual units such as humans
or mice.
 Modular organisms –organisms that do not come in
simple units of individuals
-Several grasses that are attached by runners
-Corals , bryozoans
 Plants derived from one zygote can produce new
plants or modules a sexually by means of buds on
hallow horizontal roots or by stems that touch the
ground.
 Individual plants produced by sexual reproduction are
genets.
 Gemets may be remain linked to the parent or exist
individully.

8.  a)Plants as grass clumps, blackberries
,strawberries, that reproduce asexually .
 runners or stolons. Often never clear whether it’s
a single modular organisms or a
 ramet
 b)Animals such as corals,hydroids, byrozoans,
and tunicates that reproduce asexuall
 by budding.Many primitive metazoa ns are
loosely organized and from modular
 Colonies .