Lakshya Education MCQs

Question: Parasitic disease is ___ limiting population.
Options:
A.Density independent factor
B.Density dependent factor
C.Calamity
D.Population interaction
Answer: Option B
: 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.

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More Questions on This Topic :

Question 1. ___ and precipitation over a period of time in an ecological place have given rise to the major biomes on Earth.
  1.    General patterns of atmospheric conditions
  2.    Average weather of an area
  3.    Seasonal variation
  4.    Ecosystems
Answer: Option C
: 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.
Question 2. Populations that are r-strategists
  1.    Have J-shaped growth curves
  2.    Have type-III survivorship curves
  3.    Are usually pests and weeds
  4.    All of the above
Answer: Option D
: 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.
Question 3.

Representation of age pyramids for human population

From the picture above, identify the growth status of the population whether it is expanding, stable or declining
  1.    Expanding
  2.    Stable
  3.    Declining
  4.    None of these
Answer: Option A
: 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.
Question 4. The monarch and viceroy butterfly have the same bright red and black color, to indicate their poisonous nature. This is a case of ___
  1.    Mimicry
  2.    Aposematism
  3.    Mullerian Mimicry
  4.    None of the above
Answer: Option C
: 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.
Question 5. Which of the following is a partial root parasite?
  1.    Sandal wood
  2.    Mistletoe
  3.    Orobanche
  4.    Ganoderma
Answer: Option A
: A

Sandalwood is a partial root parasite which photosynthesize their own food, but tap the roots of other species for water and inorganic nutrients.

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