(c) r = intrinsic growth rate
(d) dN
dt
= population density
- In an exponential growth, where each symbol has its
usual meaning in ecology, dN
dt
=
(a) rN KN
K
−
^ (b) rN
(c) (d – b) N (d) both (b) and (c).
- Find
dN
dt
when population size is 600 individuals
and carrying capacity 800 and intrinsic growth is 0.
when population growth follow logistic growth and
exponential growth, respectively.
(a) 3 and 12 (b) 3 and 6
(c) 6 and 12 (d) 12 and 3
- monarch butterfly is highly distasteful to its predators
because
(a) it produces poisonous chemicals from nectar, on
which it feeds
(b) it has special poisonous chemicals in its body, which
it acquires by feeding upon poisonous weeds in its
larval stage.
(c) it feeds upon poisonous weeds in adulthood and
develops cardiac glycosides
(d) its ovipositor releases poisonous and abnoxious
nectar like droplets.
- how many of the following is/are wrong statement (s)?
(j) ramdeo mishra is revered as the Father of Ecology
in India.
(k) Keolado National Park in rajasthan hosts thousand
of migratory birds from extremely cold southern
regions of the world.
(l) resemblance of one species with another in order
to obtain advantage, especially against predation is
crypsis.
(m) Bell shaped age pyramid indicates stable
population.
(a) 2 (b) 3 (c) 1 (d) 4
- ‘competitive exclusion principle’ is best defined as
(a) no two members of same species share same niche.
(b) two competing species show resource partition for
their survival
(c) two competing species can’t share same niche.
(d) none of the above.
103. match the following columns.
Column I Column II
(Population Interaction) (Examples)
a. mutualism (i) Ticks on dogs
B. commensalism (ii) Balanus and Chathamalus
c. Parasitism (iii) Sparrow and seed
D. competition (iv) Epiphyte on a mango
branch
E. Predation (v) Orchid Ophrys and Colpa
aurea
(a) a-(i), B-(v), c-(iv), D-(iii), E-(ii)
(b) a-(ii), B-(i), c-(v), D-(iv), E-(iii)
(c) a-(iii), B-(ii), c-(i), D-(v), E-(iv)
(d) a-(v), B-(iv), c-(i), D-(ii), E-(iii)
104. asymptote stage of the population growth is the stage
of population in which the population is
(a) drastically fluctuating (b) decreasing
(c) increasing (d) stabilising.
105. Behavioural adaptation to environment in desert lizards
are
I. Burrowing the soil
II. Losing heat during high temperature
III. active during morning and evening
IV. Insulating body due to thick fatty dermis
Select the correct pair.
(a) I and II (b) III and IV
(c) I and III (d) II and IV
106. The birth and death rates of four countries are given
below. Which one will have the least population growth
rate?
country Birth rate/1000 Death/
m 25 5
N 35 10
O 25 8
P 58 51
(a) P (b) O (c) N (d) m
107. how many of the following statements are incorrect?
(j) ‘The Evil Quartet’ is the sobriquet used to describe
four important causes of biodiversity loss.
(k) Biodiversity hot spots occupy < 2% earth’s land, their
protection can decrease mass extinction by 30%.
(l) India has three biodiversity hot spots out of 34 of
the world.
(m) If Log a = 4, Z = 0.3 and log c = 0.8. Then log of
species richness is 2.
