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Organisms and Populations

4 Board Biology previous year questions on Organisms and Populations — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW

The logistic population growth is expressed by the equation

a

\(\rm dt/dN=Nr \big(\frac{K-N}{K}\big)\)

b

\(\rm dN/dt=rN \big(\frac{K-N}{K}\big)\)

c

\(\rm dN/dt=rN \)

d

\(\rm dN/dt=rN \big(\frac{K-K}{K}\big)\)

✓ Correct answer: b)

\(\rm dN/dt=rN \big(\frac{K-N}{K}\big)\)

Explanation

Logistic population growth is expressed by following equation:
\(\rm \frac{dN}{dt}=rN \big(\frac{K-N}{K}\big)\)
Where, N = population density at time t
r = intrinsic rate of natural increase
K = carrying capacity

Q2

Organisms that can maintain a constant internal temperature are called as

a

Oligothermic

b

Poikilothermic

c

Homeothermic

d

None of these

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Q3

Name the interaction in which one species receives benefit and other is neither harmed nor benefitted.

a

Mutualism

b

Ammensalism

c

Competition

d

Commensalism

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Q4

Echidna is

a

connecting link

b

Vestigial organ

c

Extinctlink

d

None of these

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