NCERT NEET Biology Ecology Questions,answers,solutions,mcqs,pdfs

Ecology Organism and Population Mock Test-7

Question No:1

Population size in any given habitat is also known as ______

[A] Population cluster
[B] Population explosion
[C] Population abundance
[D] Population density



Question No:2

Tiger census in our national parks and tiger reserves is done by counting

[A] Tiger cubs
[B] Tiger pug marks
[C] Tiger faecal pellets
[D] Both (b) and (c)



Question No:3

Natality refers to

[A] No. of births in a given geographical area
[B] No. of births in a given time period
[C] No. of births under influence of given environmental factor
[D] No. of deaths in a given time period



Question No:4

A striking difference between immigration and emigration is _______

[A] Immigration considers total no. of species in a given habitat while emigration refers to a single species
[B] Emigration considers total no. of species in a given habitat while immigration refers to a single species
[C] Immigration considers total no. of dominant species in a given habitat while emigration refers to a single species
[D] Immigration considers total no. of species in a given habitat while emigration refers to a dominant single species



Question No:5

Identify the correct equation for population density at time t +

[A] N = N1+[(D + I)-(B+E)]
[B] N = N1+ [(B +I)-(D + E)]
[C] Nt+1 = N1 + [(B + D) – (I + E)]
[D] Nt+1 = N1 + [(B + I) – (D + E)]



Question No:6

If a new habitat is just being colonized then which of the following options do you think would have a greater contribution towards population density?

[A] Mortality
[B] Natality
[C] Immigration
[D] Emigration



Question No:7

While developing theory of natural selection, Darwin observed that each species could realize fully its innate potential to grow in number provided in a particular habitat ______

[A] Favourable environmental conditions are prevalent
[B] Absence of natural disasters like floods and famine
[C] Availability of unlimited resources
[D] Development of mutation in certain species



Question No:8

Study the following equation in context of population growth and choose the correct option
dN/dt = (b – d) x N
(i) Substituting r in place of b — d then
dN/dt = rN
(ii) Here ‘r’ is known as _______

[A] Extrinsic rate of natural decrease
[B] Intrinsic rate of natural decrease
[C] Intrinsic rate of natural increase
[D] Extrinsic rate of natural increase



Question No:9

The r value for Norway rat is _______

[A] 0.15
[B] 0.0015
[C] 0.015
[D] 1.5



Question No:10

The r value for flour beetle is _______

[A] 0.15
[B] 0.12
[C] 0.21
[D] 0.012



Question No:11

The r value for human population in India is _______

[A] 0.15
[B] 0.0502
[C] 0.0205
[D] 0.012



Question No:12

When N (population density) is plotted against tune ______ shaped graph is obtained (using equation, (ii) as per question )

[A] S
[B] J
[C] U
[D] Inverted U



Question No:13

The integral form of equation (ii) as given in question is ______

[A] N = N0erN
[B] N = N0ert
[C] Nt = N0erN
[D] Nt = N0ert



Question No:14

Any species growing exponentially under ______ resource conditions can reach massive population densities in a short time span

[A] Limited
[B] Unlimited
[C] Essential
[D] Non-essential



Question No:15

Assertion (A): A particular species in nature can achieve exponential growth Reason (R): Availability of unlimited resources makes it possible.

[A] A is true but R is incorrect
[B] R is correct and A is incorrect
[C] Both A and R are incorrect
[D] Both A and R are correct