Environmental Changes And Population
Environmental Changes And Population
Environment changes and populations : - When the environment changes, the population sizes of all species can be affected. These changes involve both and abiotic factors. The most common environmental changes are those due to seasonal changes in abiotic factors such as temperature, light and water.
In solution Australia, native plants have a growth spurt in spring when there is adequate water and light and temperatures are around .
Many plants also flower at this time, providing food for animals that drink nectar or eat flowers. Therefore, the changes in abiotic factors. Increased quantities of plant matter result in increased numbers of herbivores (plant-eaters) and the carnivores (meat-eaters) that feed on the herbivores and on each other.
The size of a population changes because environmental factors affect the rates of birth, death, immigration and emigration.
Factors that affect population size in an area
| Factor | Definition of Factor | Example of how the environment changes the factor |
|---|---|---|
| Birth rate | Number of individuals born per thousand of the population. | The number of animal births often increased when food is plentiful. Adults have more energy and breed. More breeding adults can survive because more food is available. |
| Death rate | Number of individuals who die per thousand of the population | When food is plentiful more animals survive and less die, which keeps the population high. .In contrast, exposure to unusually low temperatures can increase the death rate (Figure 9.1.18). |
| immigration | Number of individuals moving into an area per thousand of the population in the area | More animals move into an area when there are more resources such as food and water. |
| emigration | Number of individuals moving out an area per thousand of the population in the area | Animals usually move out of an area when they do not have enough food and water. |
Sex ratio of a population can be calculated as ____________ | |||
| Right Option : B | |||
| View Explanation |
In Australia, native plants show spurt growth in spring season with temperature of about ___________. | |||
| Right Option : C | |||
| View Explanation | |||
The study of human population is called as the _____________. | |||
| Right Option : B | |||
| View Explanation | |||
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