Why small animals are not found in polar area mostly?

(1) Because they have a smaller surface area relative to their volume

(2) Because they have a larger volume relative to their surface area

(3) Because they have a smaller metabolic rate

(4) Because they have a larger surface area relative to their volume

Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
 70%
From NCERT
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Kangaroo rats:

(1) Have a generalized diet               

(2) Avoid eating fats

(3) Do not need to drink water          

(4) Are insensitive to heat

Subtopic:  Adaptations (OLD NCERT) |
 90%
From NCERT
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Find out false one:
(1) Mammals from colder climate generally have shorter ears and limbs to minimise heat loss

(2) All organisms have behavioural adaptations that allow them to respond quickly to a stressful situation

(3) Some organisms possess adaptations that are physiological which allow them to respond quickly to a stressful situation

(4) A large variety of invertebrates and fish live at great depths in the ocean where the pressure could be > 100 times than the normal atmospheric pressure

Subtopic:  Adaptations (OLD NCERT) |
 55%
From NCERT
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Which of the following statement is false with respect to adaptations?
(1) Many xerophytic plants have thick cuticle on leaf epidermis, sunken stomata

(2) Some xerophytic plants have special photosynthetic pathway (CAM) that enables their stomata close during day

(3) Opuntia has spines (modified leaves), photosynthetic phylloclade (stem)

(4) All adaptations are genetically fixed all organisms

Subtopic:  Adaptations (OLD NCERT) |
 83%
From NCERT
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Density of a population (D) is:

(1) D=D (size)W (wt.)                           

(2) D=S (space)N (number)

(3)  D=N (number)S (space)                           

(4) None of the above

Subtopic:  Population: Exponential Growth Model |
 67%
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If the age distribution (percent individuals of a given age or age group) is plotted for population, the resulting structure is called:

(1) Survivorship curve                       

(2) Life table

(3) Age pyramid                                

(4) Logistic model

Subtopic:  Population Characters: Age Structure & Migration |
 93%
From NCERT
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The age distribution of a population is determined by:

(1) Timing of birth

(2) Timing of death

(3) The rate at which the population is growing

(4) All are correct

Subtopic:  Population Characters: Age Structure & Migration |
 54%
From NCERT
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What four factors define population growth?

(1) Births; deaths, immigration, emigration

(2) Survivorship, age-specific mortality, fecundity, death rate

(3) Mark-recapture, census, quadrate sampling, transects

(4) Age-specific birth rate, metapopulation structure, quadrate, ecotone

Subtopic:  Population Dynamic |
 96%
From NCERT
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Population growth of a species is not related to which of the following parameters?
(1) Nt + 1 = Nt + [(B + I) − (D + E)]

(2) Out of the four basic processes effecting population growth three leads to increase in population size

(3) For a newly colonised habitat immigration plays major role than birth rate

(4) Under normal conditions, natality and mortality are the most important factors

Subtopic:  Population Characters: Density |
 84%
From NCERT
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The density of a population in a given habitat during a given period, fluctuates due to changes in four basic processes. On this basis fill up A and B boxes in the given diagram with correct options:

(a) A = Natality + Immigration, B = Mortality + Emigration

(b) A = Natality + Mortality, B = Immigration + Emigration

(c) A = Birth rate + Death rate, B = Migration + Emigration

(d) A = Natality + Emigration, B = Mortality + Immigration

Subtopic:  Population Characters: Density |
 95%
From NCERT
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