done 12th Biology Organisms and Environment

• question_answer1)
  How is diapause different from hibernation? 
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• question_answer2)
  If a marine fish is placed in a fresh-water aquarium, will the fish be able to survive? Why or why not? 
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• question_answer3)
  Define phenotypic adaptation. Give one example. 
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• question_answer4)
  Most living organisms cannot survive at temperature above 45°C. How are some microbes able to live in habitats with temperatures exceeding 100°C? 
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• question_answer5)
  List the attributes that populations but not the individuals possess. 
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• question_answer6)
  If a population growing exponentially doubles in size in 3 years, what is intrinsic rate of increase (r) of the population? 
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• question_answer7)
  Name important defence mechanisms in plants against herbivory. 
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• question_answer8)
  An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree? 
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• question_answer9)
  What is the ecological principle behind the biological control method of managing with pest insects? 
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• question_answer10)
  Distinguish between: (a) Hibernation and aestivation; (b) Ectotherms and endotherms.  
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• question_answer11)
  Write a short note on: (a) Adaptations of desert plants and animals. (b) Adaptations of plants to water scarcity. (c) Behavioural adaptations in animals. (d) Importance of light to plants. (e) Effect of temperature or water scarcity and the adaptations of animals.  
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• question_answer12)
  List the various abiotic environmental factors. 
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• question_answer13)
  Give an example for: (a) An endothermic animal. (b) An ectothermic animal. (c) An organism of benthic zone.  
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• question_answer14)
  Define population and community. 
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• question_answer15)
  Define the following terms and give one example of each: (a) Commensalism (b) Parasitism (c) Camouflage (d) Mutualism (e) Interspecific competition.  
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• question_answer16)
  With the help of suitable diagram describe the logistic population growth curve. 
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• question_answer17)
  Select the statement which best explains parasitism: (a) One organism is benefitted (b) Both the organisms are benefitted (c) One organism is benefitted, other is not affected (d) One organism is benefitted, other is affected  
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• question_answer18)
  List any three important characteristics of a population and explain. 
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