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Class 12 Biology Objective In English Chapter – 13 Organisms and Populations
1. Number of deaths during a limited time period and place for a particular population is known as
( A ) Natality
( B ) Mortality
( C ) Migratory
( D ) Integrity
Ans-( B )
2. Climax community is present in which area ?
( A ) In equilibrium
( B ) In transition
( C ) Bare land
( D ) None of these
Ans-( A )
3. The maximum number of species has been extincted from :
( A ) islands
( B ) mainland
( C ) oceans
( D ) fresh water bodies
Ans-( A )
4. Loss of relative biological equilibrium is due to :
( A ) low temperature
( B ) high temperature
( C ) radiation
( D ) pollution
Ans- ( D )
5. The value of Biological potency is measured by
( A ) Birth rate Death rate
( B ) Birth rate + Death rate
( C ) Birth rate : Death rate
( D ) None of above
Ans-( A )
6. The bacteria Rhizobium present in soil in which way take part in the population growth of plants ?
( A ) By Nitrogen-fixation & increase in soil fertility.
( B ) By Fungal roots
( C ) By commensalism
( D ) None
Ans-( A )
7. The shallow-water region near by Pond is called
( A ) Littoral zone
( B ) Limnetic zone
( C ) Profundal zone
( D ) Benthic zone
Ans-( A )
8. Animal that can tolerate water loss equal to one third body weight is :
( A ) Necturus
( B ) Camel
( C ) Lizard
( D) Chiton
Ans-( B )
9. In commensalism :
( A ) Both partners are benefitted
( B ) Both partners are harmed
( C ) Weaker is benefitted while stronger is unharmed
( D ) None of the above
Ans-( C )
10. A successful parasite is the one which :
(A) Grows rapidly
(B) Reproduces fast
(C) Sticks to host for long
(D) Makes minimum demands from its host
Ans-( D )
11. The formula for Log/ Exponential growth is :
( A ) dt/dN
( B ) IN/N = dt
( C ) rN/dN = dt
( D ) dN/dt = rn
12. Unrestricted reproductive capacity is:
( A ) Birth rate
( B ) Carrying capacity
( C ) Biotic potentiality
( D ) Fertility
Ans-( C )
13. One who secures food at the costof others is :
( A ) Parasite
( B ) Insectivore
( C ) Commensal
( D ) Saprophyte
Ans-( D )
14. Frog feeding on herbivorous insect is:
( A ) Primary consumer
( B ) Secondary consumer
( C ) Tertiary consumer
( D ) Top carnivore
Ans-( B )
15. Mutualism occurs between :
( A ) Butterfly and flower
( B ) Escherichia coli and man
( C ) Zoochlorellae and Hydra
( D ) Hermit Crab and Sea Anemone
Ans-( C )
16. The maximum growth rate is in
( A ) Senescent phase
( B ) lag phase
( C ) Exponential phase
( D ) Stationary phase
Ans-( C )
17. Which in the following has root cap?
( A ) Xerophyte
( B ) Mesophyte
( C ) Hydrophyte
( D) Hallophyte
Ans-( C )
18. The mycorrhiza is an example of
( A ) Symbiotic interaction
( B ) Ectoparasite
( C ) Endoparasite
( D )Decomposer
Ans-( A )
19. Lichen is the association of
( A ) Algae & algae
( B ) Algae & fungi
( C ) Algae & higher plant roots
( D ) Fungi & fungi
Ans-( B )
20. The region of atmosphere near theearth is called
( A ) Stratosphere
( B ) Mesosphere
( C )Trophosphere
( D )Thermosphere
Ans-( C )
21. Which in the following has highest number of species?
( A ) Birds
( B ) Angiosperms
( C )Fungi
( D ) Insects
Ans-( D )
22. Hibernation occuring in certainanimal is :
( A ) Rhythmic
( B ) Periodic
( C ) Occasional
( D ) Intermittent
Ans-( B )
