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Class 12
Botany :-NCERT Solutions - Organisms and Population.

Question 1

How is diapause different from hibernation?


Question 2
If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not?


Question 4
Most living organisms cannot survive at temperature above 45°C°. How are some microbes able to live in habitats with temperatures exceeding 100°C?


Question 6
If a population growing exponentially double in size in 3 years, what is the intrinsic rate of increase (r) of the population?


Question 8
An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?


Question 9
What is the ecological principle behind the biological control method of managing with pest insects?


Question 10
Distinguish between the following:
(a) Hibernation and Aestivation
(b) Ectotherms and Endotherms


Question 13
Give an example for:
(a) An endothermic animal
(b) An ectothermic animal
(c) An organism of benthic zone


Question 15
Define the following terms and give one example for each:
(a) Commensalism
(b) Parasitism
(c) Camouflage
(d) Mutualism
(e) Interspecific competition


Question 18
List any three important characteristics of a population and explain