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Organisms And Populations

Question
CBSEENBI12001931
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Explain Parasitism and co. evolution with the help of one example of each.

Solution

Parasitism - is a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host. For example the relationship between the human liver fluke and its hosts that is the snail and a fish. 

In the case of co-evolutiion, the species interact so intimately that they can cause evolutionary changes in each other over time.The term coevolution is used to describe cases where two (or more) species reciprocally affect each other's evolution. So for example, an evolutionary change in the morphology of a plant, might affect the morphology of a herbivore that eats the plant, which in turn might affect the evolution of the plant, which might affect the evolution of the herbivore. For example, the Mediterranean orchid Ophrys bears flowers, the petals of which bear uncanny resemblance with the female bee. If there are any changes in the female bee's colour or pattern, the plant will also co-evolve to maintain the resemblance.

Some More Questions From Organisms and Populations Chapter

Ants give information to their companions :

Population density is denoted by the symbol

The number of births during a given period in the
population that are added to the initial density is 

 :

The departure of a individual from a population is called :

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?

Which of the following interaction both species suffer ?

In which of the following interaction both species are benefitted ?

Fill in the blanks with suitable words :

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

State true or false :

Coin one word for the following statements :

1.Organism that can tolerate only a narrow range of salinity.

2. Plants that can survive a wide range of temperature.

3. Interaction of two species in which one is benefited while other is neither benefited nor harmed.

4. Number of births during a given period in the population that are added to the initial density.

5. the process of maintaing a constant body temperature.

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