CBSE Class 12 Biology Quiz | CBSE Class 12 Biology Short Questions & Answers

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Questions
41 From his long term ecosystem experiments, David Tilman showed that
A decreased diversity contributed to higher productivity
B decreased diversity contributed to decreased productivity
C increased diversity contributed to increased productivity
D increased diversity contributed to decreased productivity

Answer: increased diversity contributed to increased productivity
42 Which of the following organisation is responsible for maintaining the Red Data Book?
A IUCN
B USDA
C IDRI
D All of these

Answer: IUCN
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43 Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? [NCERT Exemplar]
A 2-10%
B 50%
C Less than 1%
D 30%

Answer: 2-10%
44 Which of the following ecosystems is most productive in terms of net primary production? [NCERT Exemplar]
A Estuaries
B Deserts
C Tropical rain forests
D Oceans

Answer: Tropical rain forests
45 The reservoir for the gaseous type of biogeochemical cycle exists in [NCERT Exemplar]
A stratosphere
B atmosphere
C ionosphere
D lithosphere

Answer: atmosphere
46 The sequence of communities of primary succession in water is
A phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
B free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
C phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
D phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.

Answer: phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
47 Which of the following statements is correct for secondary succession?
A It is similar to primary succession, but has a relatively fast pace..
B It follows primary succession.
C It begins on a bare rock.
D It occurs on a deforested area.

Answer: It is similar to primary succession, but has a relatively fast pace.
48 Which of the following is a pioneer species in xerarch succession?
A Lichens
B Sedges
C Bryophytes
D Phytoplanktons

Answer: Lichens
49 The last stable community in succession that is in equilibrium with the environment, is called
A climax community
B pioneer community
C serai community
D None of these

Answer: climax community
50 In a pond ecosystem, the food chain starts with
A Zooplanktons.
B Small insects
C Phytoplanktons
D Small fishes

Answer: Phytoplanktons
51 Which of the following represents the sedimentary type of nutrient cycle?
A Nitrogen cycle
B Carbon cycle
C Phosphorus cycle.
D Oxygen cycle

Answer: Phosphorus cycle.
52 What parameters are used for tiger census in our country’s national parks and sanctuaries? [NCERT Exemplar]
A Pug marks and faecal pellets
B Actual head counts
C Pug marks only
D Faecal pellets only

Answer: Pug marks and faecal pellets
53 Which of the following would necessarily decrease the density of a population in a given habitat? [NCERT Exemplar]
A Mortality and emigration
B Natality and immigration
C Natality > mortality
D Immigration > emigration

Answer: Mortality and emigration
54 A population has more young individuals compared to the older individuals. What would be the status of the population after some years? ]NCERT Exemplar]
A It will increase
B It will first decline and then stabilise
C It will decline
D It will stabilise

Answer: It will increase
55 Amensalism is an association between two species where
A one species is harmed and other is benefitted
B one species is harmed and other is unaffected
C one species is benefitted and other is unaffected
D both the species are harmed.

Answer: one species is harmed and other is unaffected
56 Niche overlap indicates
A mutualism between two species
B active cooperation between two species
C sharing of one or more resources between the two species
D two different parasites on the same host.

Answer: sharing of one or more resources between the two species
57 The formula of exponential population growth curve, is
A dN/dt = rN
B rN/dN = dt
C dt/dN rN
D dN/rN = dt

Answer: dN/dt = rN
58 Individuals of one kind, i.e., one species occupying a particular geographic area, at a given time form a/an
A population
B deme
C community
D biome

Answer: population
59 It natality is balanced by mortality in a population at a given time, there will be a/an
A decrease in the population size
B increase in the population size
C zero population growth
D population explosion

Answer: zero population growth
60 Mycorrhiza is an example of
A mutualism
B predation
C endoparasitism
D ectoparasitism

Answer: mutualism

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