Answer: Option C. -> Mullerian Mimicry
:
C
The monarch and viceroy butterfly are poisonous in nature. The bright red and black colour on them indicates their poisonous nature to predators. This kind of mimicry is called as Mullerian Mimicry. In Mullerian Mimicry, the organisms that mimic each other are dangerous and sometimes venomous. They both co-adapt a warning mechanism for potential predators.

Answer: Option A. -> Expanding
:
A
What is shown here is an age pyramid. Anage pyramidis a graphical illustration that shows the distribution of various age groups in a population.Age pyramids with a broader base, that is a large number of individuals in the pre-reproductive and reproductive stages indicate anexpanding population. When the number of individuals is more or less equal in all age classes, it indicates astable populationand when the base is narrow with lesser pre-reproductive individuals, it indicates a declining population.

Answer: Option B. -> Density dependent factor
:
B
Density dependent factors are those factors that limit population when there is an increase in the population density. Since parasitic diseases and infections are communicable, they are predominant in very dense populations, therefore disease is a density dependent factor limiting population. Density independent factors are factors that are not triggered by population density, but chance occurrences like natural calamities.

Answer: Option C. -> Seasonal variation
:
C
Seasons are a result of the Earth’s slight axis as it revolves around the sun. This changes the intensity and duration of sun’s heat which in turn affects the temperature of different regions on Earth. This coupled with precipitation over a period of time in a given ecological place has given rise to the major biomes. A biome is thus a cumulation of the various interactions between different ecosystems. Each biomes have their distinct weather, rainfall, animals and plants.

Answer: Option D. -> All of the above
:
D
Populations that are r-strategists have a high growth rate or r value. Therefore in ashort period of time thesepopulations produce many offsprings, which require little care. Therefore, these populations usually have a survivorship curve similar to type-III. They alsotend to have J-shaped growth curves because they are rarely regulated by density dependent factors. Their population crashes whensome environmental change causes them to die,usually within a short time.Examples of r-selected species include pest organisms, such as rodents, insects, and weeds.

Answer: Option A. -> Both A and R are correct and R explains A
:
A
Elephants are a classical example of organisms following K strategy for growth. Since they are so large and live in stable and predictable environments, their population size seldom decrease. Elephants also have a very long life. And therefore they do not need to high growth rate. However, since they grow at a slow pace, elephants invest a lot at parental care for their offsprings, thus ensuring a stable population size.

Answer: Option B. -> Biotic potential
:
B
The value of growth rate under unlimited favourable conditions is called biotic potential or reproductive potential. It is characteristic of apopulation. Birth rate is the rate at which individuals are added to a population by births. Death rate or mortality is the rate at which individuals are removed from a population by death.

Answer: Option C. -> Eurythermal
:
C
Eurythermal organisms are those that are able to tolerate a wide range of temperatures. Organisms that can tolerate only a narrow range are called stenothermal organisms. Thermoregulators are organisms that regulate their body temperature, organisms that donot regulate their body temperature are called thermoconformers.

Answer: Option B. -> Plasmodium
:
B
Plasmodium is an endoparasite that is living inside the host organism. While lice, bedbugs and mites are ectoparasites, which live on the host body.

Answer: Option D. -> Crude birth rate
:
D
Number of births per thousand individuals is defined as the crude birth rate of the population. Growth rate is the rate of increase in population per capita. Reproduction rate or the net reproduction rate is an alternate fertility measure that denotes the averagenumber ofdaughtersa woman would have in her lifetime.