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The intrinsic rate of natural increase for Indian human population according to the 2011 census was

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Important Questions on Organisms and Populations

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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Match Column - I with Column - II
  Column-I     Column-II
a  Saprophyte  i Symbiotic association of fungi with plant roots
b Parasite ii  Decomposition of dead organic materials
c  Lichens iii Living on living plants
d  Mycorrhiza iv  Symbiotic association of algae and fungi

Choose the correct answer from the options given below:
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
The principle of competitive exclusion was stated by
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Match the following and select the correct option:
(a) Earthworm (p) Pioneer species
(b) Succession (q) Detrivore
(c) Ecosystem service (r) Natality
(d) Population growth (s) Pollination
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Which of the following statements is incorrect?
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
In which of the following interaction both partners are adversely affected?
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
The impact of immigration on population density is:
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Asymptote is a logistic growth curve is obtained when
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
The following equation describes the exponential growth of a population
MEDIUM
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that.


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EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
If ' + ' sign is assigned to beneficial interaction, ' – ' sign to detrimental and ' 0 ' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Which of the following statements is/are incorrect?
1) The human liver fluke, a nematode parasite, depends on two intermediate hosts (a snail and a fish) to complete its life cycle.
2) The malarial parasite needs a vector (mosquito) to spread to other host organisms.
3) In case of brood parasitism, the eggs of parasitic birds (e.g., cuckoo) are not detected and removed from the nest because the parasite's eggs resemble the host's eggs in morphology and colour.
4) A population of frogs protected from all predators would decrease indefinitely.
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Gause's principle of competitive exclusion states that:
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes

In the following equation of Verhulst - Pearl logistic growth, the letter 'r' denotes ___ .

dNdt=rNK-NK

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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Which of the following is not an attribute of a population?
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes

The shape of the pyramids reflects the growth status of the population. Identify the type of age pyramid represented below for human population.

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MEDIUM
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes

Read the following data carefully

Parameter Values
Initial population of lions 400
Number of new births in one year 100
Number of deaths in one year 40

Imagine the lion population grows logistically where the carrying capacity is 800. Then the per capita birth rate(b), per capita death rate(d), intrinsic rate of natural increase(r), increase or decrease in population during the unit time period dNdt are respectively

MEDIUM
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Gause's competitive exclusion principle states that the two species cannot co-exist indefinitely and the competitively superior species will eventually eliminate the other species Which of the following statements are correct regarding validity of the Gause's principle.
A) If resources are limited
B) If two species occupy different niches
C) If resource partitioning takes place between two species
D) If two species occupy identical niche
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Which of the following is correct for r-selected species?
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Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt=rN1-N/K:
EASY
Biology>Biodiversity, Ecology and Environment>Organisms and Populations>Population Attributes
Which one of the following population interactions is widely used in medical science for the production of antibiotics?