Ecology is basically concerned with four levels of biological organisation – organisms, populations, ______ and biomes.
2 of 15
Although the term ______ implies sexual reproduction, a group of individuals resulting from even asexual reproduction is also generally considered a population for the purpose of ecological studies
3 of 15
All the cormorants in a wetland, rats in an abandoned dwelling, teakwood trees in a forest tract, bacteria in a culture plate and lotus plants in a pond, are some examples of a ______ .
4 of 15
It is at the population level that natural selection operates to evolve the desired traits. Population ecology is, therefore, an important area because it links ecology to population ______ and evolution.
5 of 15
A population has certain attributes whereas, an individual organism does not. An individual may have births and deaths, but a population has birth rates and ______
6 of 15
In a population these rates refer to per capita births and deaths. The rates, hence, expressed are change in numbers (increase or ______ ) with respect to members of the population.
7 of 15
Another attribute characteristic of a population is ______ ratio.
8 of 15
The shape of the pyramids reflects the growth status of the population-(a) whether it is growing, (b) ______ or (c) declining.
9 of 15
The size of the ______ tells us a lot about its status in the habitat.
10 of 15
The size, in nature, could be as low as <10 (Siberian cranes at Bharatpur wetlands in any year) or go into millions ( ______ in a pond).
11 of 15
Population size, technically called population density (designated as __), need not necessarily be measured in numbers only. Although total number is generally the most appropriate measure of population density, it is in some cases either meaningless or difficult to determine
12 of 15
the per cent cover or ______ is a more meaningful measure of the population size.
13 of 15
The tiger census in our national parks and tiger reserves is often based on pug marks and ______ .
14 of 15
The size of a population for any species is not a static parameter. It keeps changing with time, depending on various factors including food availability, ______ pressure and adverse weather
15 of 15
In fact, it is these changes in population density that give us some idea of what is happening to the population – whether it is ______ or declining
Mediquiz