Class-B.Sc.-III Subject-
Ecology Paper -XV
Q. Multiple Choice questions.
1) Any individuals of the same species living
together in a defined area form a/an
a .
community. b . genus.
c . population. d .
ecosystem. e . variety.
2) Biological
communities change because
a . each stage modifies the environment and
adapts for a later stage.
b . the soil is depleted and food gives out.
c . old species move out and new species move
in.
d .
old species evolve into new species.
e .
new species move in, displacing old species.
3 . Which of
the following is characteristic of parasitism?
a) One organism kills and consumes another.
b)
Two organisms live together and neither is harmed.
c )
Two organisms feed side by side from the same food.
d) Two organisms nourish each other; both
benefit.
e) One
organism lives in or on another and benefits.
4. Which
of the following terms best describes the inter- relationship between nitrogen
fixing bacteria and the clover in whose roots they live?
a . mutualism
b . commensalism c .
predation d . parasitism e . amensalism
5 . The
sequence of energy flow through a food chain is
a .
primary consumers producers higher order consumers.
b .
producers higher order
consumers primary consumers.
c .
higher order consumers primary
consumers producers.
d .
primary consumers higher order
consumers producers.
e .
producers primary consumers higher order consumers.
6 . In a
terrestrial ecosystem, the trophic level that would contain the largest biomass
would be the
a
. producers. b .
primary consumers. c .
secondary consumers.
d .
highest order consumers. e . decomposers.
7 . The rate of growth of a natural population
a . always reaches the carrying capacity of the
ecosystem.
b
. is limited by the carrying capacity
of the ecosystem.
c
. when graphed, always has a positive
slope.
d . is
calculated by subtracting death rate from birth rate.
e . exceeds the death rate and rate of
emigration.
8. A group of populations that interact in an area
is __________.
a. a biome
b. an
ecosystem
c. a
population
d. a
community
9. Lions, birds, snakes and trees are all
__________.
a. biotic
factors
b. part of
a niche
c. abiotic
factors
d. in the
same food chain
10. Grass --> Grasshopper --> Mockingbird
represents __________.
a. an
ecosystem
b. a food
pyramid
c. a food
web
d. a food
chain
11. Energy in an ecosystem is used for growth or
lost as __________.
a. biomass
b. death
c. heat
d. light
12. Algae, grasses and trees are all __________.
a. consumers
b. producers
c. decomposers
d. pyramids
13. A trophic level represents a _________.
a. feeding
level
b. chemical
cycle
c. pyramid
d. consumer
14. If one organism is closely associated with and
survives at the expense of another, a __________ relationship exists.
a. mutualistic
b. herbivore
c. parasitic
d. commensalistic
15. The portion of Earth that supports life is the
__________.
a. ecosystem
b. community
c. individual
d. biosphere
16. An animal that eats plants and meat is
an__________.
a. herbivore
b. omnivore
c. producer
d. carnivore
17Organisms that break down organic matter are
__________.
a. autotrophs
b. decomposers
c. in the
plant kingdom
d. producers
18. An organism`s role in its community is its
__________, and where it lives is its ____.
a. habitat;
niche
b. niche;
habitat
c. role in
community; niche
d. niche;
role in the community
19. Herbivores and carnivores are _________, but
plants and algae are______.
a. animals;
consumers
b. consumers;
producers
c. consumers;
decomposers
d. Comnivores;
producers
20 The term
"detritivore" includes
a) decomposers b) primary consumers c)secondary consumers d )autotrophs
21 Net
primary productivity is the gross primary productivity less
a)that which is consumed by herbivores
b) that which is consumed by the producer in
metabolism
c)Secondary consumer loss due to mortality
22 Which of
the following does not contribute to the species diversity of the tropics?
a)predictability b) predation c)spatial homogeneity d)high productivity
23 Which of
the following is a secondary consumer?
a) carnivore
b) herbivore c) all of the
above d) none of the above
24 Which of the following pyramids can never be
inverted in a natural ecosystem?
a) pyramid of numbers b) pyramid of energy
c) pyramid of
biomass d)none can be inverted
25 Which of the following organisms is a primary
consumer?
a) an
autotroph b) a horse parasite c)an oak tree parasite d) a wolf a seaweed
26 The total
amount of energy that is converted to organic compounds in a given area per
unit of time is called the
a)Biomass
transpiration b)net primary productivity
c)gross primary d) consumer rate
27
Carnivores represent what trophic level?
a)Producers
b) decomposers c)consumers
28 Which of
the following is producer
a) a snake b)a
mouse c)a bacterium d) owl
29. Which one of the following is not a functional
unit of an ecosystem?
a)Productivity b)Stratification c) Energy flow d)Decomposition
30 The upright pyramid of number is absent in
a)Lake b)Grassland
c)Pond d)Forest
31 Identify the possible link "A" in the
following food chain: Plant → insect → frog → "A" → Eagle
a) Cobra
b) Parrot c)Rabbit d)Wolf
32 The final stable community in ecological
succession is
a) Climax
b) Sere c) Pioneers d)Carnivores
33. Trophic
levels in ecosystem is formed by :
a) only herbivores b)
only plants only bacteria c) Organisms linked in food chain
34 Which one of the following ecosystem types has
the highest annual net primary
productivity?
a) Tropical deciduous forest b)Tropical rain forest
c)Temperate deciduous forest d)Temperate evergreen forest
35 A population is a group of --------
a) Individuals in a species b)Species in a community
c) Communities in an ecosystem d) Individuals
in a family
36 What is
the most important factor for the success of animal population?
a)Natality
b)Adaptability c)unlimited food d)interspecies activity
37 The formula for exponential population growth is
a) dN/dt =rN b)dt/dN=rN c)dN/rN = dt d)rN/dN=dt
38 Human
population growth curve is a----
a)S-shaped curve b)Parabola
curve c)J-shaped curve d) Zig-Zag curve
39.Growth occurs when there is---
a) Great environmental resistance b) no
environmental resistance
c) no biotic potential d)a fixed carring capacity
40 A human population is small ,there is a
greater chance of---
a) gene
flow b) genetic drift c)natural
selection d) mutation
41 In a population unrestricted reproductive
capacity is called as---
a) carrying capacity b)
biotic potential
c) birth rate d)
fertility rate
42.The
pyramids of numbers is inverted in the case of---
a) Parasitic food chain b) Grassland ecosystem
c) Forest
ecosystem d)
lake ecosystem
43. The concept of ecological pyramid was first
proposed by
a) E.P.Odum b) A.G.Tansley
c) Juday d) Charles
Elton
44 The pyramid of energy in terrestrial ecosystem is
a) upright b) inverted c) spindle shaqped d) irregular
45 Which of the following ecological pyramid is
always upright?
a) Pyramid of energy b)Pyramid of number
c) Pyramid of
biomass d)None of these
46. The pyramid of numbers in a single tree is
a) Upright b)inverted c) spindle shaped d)None of these
47 A graphic representation of numbers of
individuals of different species belonging to each trophic level in
an ecosystem is known as-----
a) Ecological
pyramid b)pyramid of biomass
c) Pyramid of number d)
pyramid of energy
48 The pyramid of biomass is inverted in
a) Forest
ecosystem b)grassland ecosystem
c) fresh water ecosystem d) tundra
49 In pond ecosystem, the pyramid of biomass is
a) Upright b)inverted c) spindle shaped d)None of these
50 In
grassland ecosystem, the pyramid of biomass is
a) Upright b)inverted c) spindle shaped d)None of these