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NCERT solutions Biology Textbook for Class 12 chapter 13 Organisms and Populations

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Chapter 13 - Organisms and Populations

Pages 239 - 240

How is diapause different from hibernation?

Q 1 | Page 239 | view solution

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

Q 2 | Page 239 | view solution

Define phenotypic adaptation. Give one example.

Q 3 | Page 239 | view solution

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

Q 4 | Page 239 | view solution

List the attributes that populations but not individuals possess.

Q 5 | Page 239 | view solution

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

Q 6 | Page 239 | view solution

Name important defence mechanisms in plants against herbivory.

Q 7 | Page 239 | view solution

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

Q 8 | Page 240 | view solution

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

Q 9 | Page 240 | view solution

Distinguish between Hibernation and Aestivation

Q 10.1 | Page 240 | view solution

Distinguish between Ectotherms and Endotherms

Q 10.2 | Page 240 | view solution

Write a short note on Adaptations of plants to water scarcity

Q 11.2 | Page 240 | view solution

Write a short note on Behavioural adaptations in animals

Q 11.3 | Page 240 | view solution

Write a short note on Importance of light to plants

Q 11.4 | Page 240 | view solution

Write a short note on Effect of temperature or water scarcity and the adaptations of animals.

Q 11.5 | Page 240 | view solution

List the various abiotic environmental factors.

Q 12 | Page 240 | view solution

Give an example for  An endothermic animal

Q 13.1 | Page 240 | view solution

Give an example for An ectothermic animal 

Q 13.2 | Page 240 | view solution

Give an example for An organism of benthic zone

Q 13.4 | Page 240 | view solution

Define population and community.

Q 14 | Page 240 | view solution

Define the following term and give one example for each:

Commensalism

Q 15.1 | Page 240 | view solution

Define the following term and give one example for each:

Commensalism

Q 15.1 | Page 240 | view solution

Define the following term and give one example for each:

Parasitism

Q 15.2 | Page 240 | view solution

Define the following term and give one example for each:

Camouflage

Q 15.3 | Page 240 | view solution

Define the following terms and give one example for each

Mutualism

Q 15.4 | Page 240 | view solution

Define the following term and give one example for each:

Interspecific competition

Q 15.5 | Page 240 | view solution

With the help of suitable diagram describe the logistic population growth curve.

Q 16 | Page 240 | view solution

Select the statement which explains best parasitism.

(a) One organism is benefited.

(b) Both the organisms are benefited.

(c) One organism is benefited, other is not affected.

(d) One organism is benefited, other is affected.

Q 17 | Page 240 | view solution

List any three important characteristics of a population and explain

Q 18 | Page 240 | view solution

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