B1Poojag.1

Front 1

Factors affecting the distribution of plant species.

Back 1

-closely linked to abiotic factors in the environment such as: temperature, water, light, soil pH, salinity, and mineral nutrients.

Front 2

Factors affecting the distribution of animal species

Back 2

Affected by both abiotic and biotic factors:
-Temperature: all animals are affected by external temperatures, especially those that do not maintain constant internal body temperatures. Extremes of temperatures require special adaptations, so only some species can survive in them.
-Water: animals vary in the amount of water they require, some are aquatic and some are in the other extreme like desert rats that live in arid areas where they are unlikely to ever drink water.
-Breeding sites: All species of animals must breed. Many species need a special site to do this, and can only live in areas where these sites are available (mosquitoes need stagnant water to lay eggs).
-Food Supply: Many species are adapted to feed on specific foods an can only live in areas where thes foods are obtainable. Whales feed on krill, so they live in areas of the ocean where krill is abundant.
-Territory: Some species establish and defend territories either for feeind or breeding, giving species an even distribution.

Front 3

The significance of the difference between two sets of data, and calculating this.

Back 3

T-test: used to find whether there is a significant difference between to sets of data. The formula needs to be known. The calculated t value must be compared to a table of critical values, and must correspond to the number of degrees of freedom. If the calculated value is greater than the critical value, the difference between the means is considered significant.

Front 4

The Niche Concept

Back 4

There are many different ways of existing in an ecosystem. The mode of exystence of a species in an ecosystem is its ecological niche.
The niche includes: habitat-where the spiches lives in the ecosystem.
nutrition-how teh species obtains food.
relationships-the itneractions with other species in the ecosystem.

Front 5

Competitive Exclusion Principle

Back 5

-If 2 species have a similar niche, they will compete in the overlapping parts of the niche, like for breeding or for food. Because they do not compete in other ways, they will usually be able to coexist.
-If 2 species have exactly the same niche, they will compete in all aspects of their life and one of the 2 species will inevitably prove to be the superior competitor, and this species will cause the otherh species to disappear from the ecosystem.
Therefore, Competitive Exclusion Principle is that only one species can occupy a niche in an ecosystem.