CBSE Class 12 Biology Biodiversity and Conservation MCQs Set 05

Question: Which one of the following are two hot spots of biodiversity in India?
a) Western Ghats & North Eastern Himalayas
b) Deccan and Western Ghats
c) Himalayan and Deccan Plateau
d) Western Ghats and Gangetic Plains
Answer: a

Question: Which of the following is NOT associated with small populations?
a) Homozygosity can increase the fitness of individuals
b) Some degree of inbreeding becomes inevitable
c) Genetic drift can quickly eliminate most alleles, leaving individuals extremely similar genetically
d) Problems arise when allelic diversity is reduced
Answer: a

Question: According to the concept of species–area relations –
a) The number of species in an area increases with the size of the area
b) Larger species require larger habitat areas than do smaller species
c) Most species within any given area are endemic
d) The larger the area, the greater the extinction rate
Answer: a

Question: Where was the World Summit on Sustainable Development held?
a) South Africa
b) U.S.A.
c) South Korea
d) U.K.
Answer: a

Question: The lion-tailed monkeys Macaca silenus are found only in–
a) Kaziranga
b) Eastern Ghats and Chennai
c) Western Ghats including Travancore and Mysore
d) Himalayas
Answer: c

Question: Troublesome American water weed found in India is–
a) Trapa
b) Cyperus
c) Typha
d) Eichhornia
Answer: d

Question: Which of the following is incorrectly matched?
a) Alpha diversity – number of species in a given habitat
b) Genetic diversity – variation of genes within species
c) Beta diversity – diversity of habitat in the whole region
d) Species diversity – product of species richness & evenness
Answer: c

Question: What is the decreasing order of number of animal species in India?
a) Mammals, Aves, Reptiles, Amphibia
b) Aves, Reptiles, Mammals, Amphibia
c) Mammals, Reptiles, Amphibia, Aves
d) Reptiles, Amphibia, Mammals, Aves
Answer: b

Question: Wild life is destroyed mostly by–
a) Lack of proper care
b) Mass scale hunting
c) Destruction of natural habitats
d) Natural calamity
Answer: c

Question: What is biodiversity referred to as?
a) Species in a region
b) Genes & species in a region
c) Genetic, species & ecological diversity in a region
d) Genes and species in an ecosystem
Answer: c

Question: Conservation hotspots are best described as–
a) Areas with large numbers of endemic species that are disappearing rapidly
b) Areas where people are particularly active supporters of biological diversity
c) Islands that are experiencing high rates of extinction
d) Areas where native species are being replaced with introduced species
Answer: a

Question: What is the approximate percentage of the earth covered by terrestrial hot spots?
a) 1.5% (less than 2%)
b) 2.5%
c) 3.5%
d) 4.5%
Answer: a

Question: Which of the following phyla has the largest number of species?
a) Arthropoda
b) Echinodermata
c) Cephalochordata
d) Annelida
Answer: d

Question: How much of the Earth’s land surface have humans disturbed or degraded?
a) 60–70%
b) 5–10%
c) 30–40%
d) 10–20%
Answer: a

Question: Which species is most likely to be positively selected by natural selection?
a) One with a large gene pool
b) One with a medium gene pool
c) One with a small gene pool
d) No correlation exists between gene pool and natural selection
Answer: a

Question: Which one of the following is a pair of endangered species?
a) Garden lizard and Mexican poppy
b) Rhesus monkey and sal tree
c) Indian peacock and canna grass
d) Hornbill and Indian aconite
Answer: d

Question: As estimated by Robert May, what is the total number of species present on earth?
a) 3 million
b) 5 million
c) 7 million
d) 9 million
Answer: c

Question: Historically, island species have tended to become extinct faster than mainland species. Which of the following reasons CANNOT explain this?
a) Island species have often evolved in the absence of predators and have no natural avoidance strategies
b) Humans have introduced diseases and competitors to islands, which negatively impacts island populations
c) Island populations are usually smaller than mainland populations
d) Island populations are usually less fit than mainland populations
Answer: d

Question: What is the effect on species diversity as one moves from high to low altitudes?
a) Increases
b) Decreases
c) First increases then decreases
d) First decreases then increases
Answer: a

Question: Which of the following is NOT a benefit that humans receive from a biologically diverse world?
a) Source of medicine
b) Source of water
c) Source of economic gains
d) Source of food
Answer: b

Question: The term “The Evil Quartet” is related with
a) four major causes of forest loss
b) four major causes of population explosion
c) four major causes of air pollution
d) four major causes of biodiversity losses
Answer: d

Question: Which of these statements is true?
a) Biodiversity tends to increase as you get closer to the equator
b) Tropical regions of Earth contain very few of the world’s land species
c) Coral reefs tend to be less biologically diverse than temperate deciduous forests
d) Cold climates have greater amounts of biodiversity than warm climates
Answer: a

Question: Which species is most likely to be positively selected by natural selection?
a) One with a large gene pool
b) One with a medium gene pool
c) One with a small gene pool
d) No correlation exists between gene pool and natural selection
Answer: a

Question: Which of the following countries has the most deforestation today?
a) Brazil
b) United States
c) Japan
d) None of the above
Answer: a

Question: A keystone species is one that
a) has a higher likelihood of extinction than a non-keystone species
b) exerts a strong influence on an ecosystem
c) causes other species to become extinct
d) has a weak influence on an ecosystem
Answer: b

Question: What are the total number of hotspots present in the world?
a) 25
b) 29
c) 34
d) 39
Answer: b

Question: According to conservation biologists, how much of the Earth’s land surface should be strictly protected?
a) 25%
b) 5%
c) 50%
d) 10%
Answer: d

Question: Which of the following is not an example of in-situ conservation?
a) Biosphere Reserves
b) National Parks
c) Wildlife Sanctuaries
d) Zoos and botanical gardens
Answer: d

Question: In island biogeography, c =
a) number of species
b) a constant measuring the slope of the line
c) a constant measuring number of species per unit area of habitat
d) area
Answer: c

Question: Breeding place of Flamingo (Hansawar) in India is–
a) Sambhar lake
b) Chilka lake
c) Runn of Kutch
d) Ghana Vihar
Answer: b

Question: Biosphere reserves differ from national parks and wildlife sanctuaries because in the former–
a) Human beings are not allowed to enter
b) People are an integral part of the system
c) Plants are paid greater attention than animals
d) Living organisms are brought from all over the world and preserved for posterity
Answer: b

Question: Threats to biodiversity come from –
a) Habitat loss
b) Overexploitation
c) Intensive agriculture
d) All
Answer: d

Question: The ____ encourages the division of protected areas into zones with different purposes and levels of human impact.
a) Man and Biosphere Program (MAB)
b) Biosphere Reserve
c) Chipko Andolan Movement
d) IUCN World Conservation Strategy
Answer: a

Question: The major extinction from India is due to–
a) Cannibalism
b) Felling of trees
c) Habitat destruction
d) None of these
Answer: c