CBSE Class 12th Biology Chapter 13 - Organisms and Populations Important Questions with Answers
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Mention the term used to describe a population interaction between an orchid growing on a forest tree. (Delhi 2019)
Or
What is an interaction called when an orchid grows on a mango plant? (Delhi 2012)
Question 2.
State Gause’s ‘competitive exclusion’ principle. How have the recent studies modified this principle? (All India 2019)
Question 3.
Name and explain the interaction that is seen between clown fish and sea anemones. (All India 2019)
Or
Why dd clown fish and sea anemone pair up? What is this relationship called? (Delhi 2012; All India 2008)
Question 4.
Mention the special adaptations evolved in parasites and why? (Delhi 2019)
Or
Explain parasitism and coevolution with the help of one example of each. (All India 2016)
Or
Explain coevolution with reference to parasites and their hosts. Mention any four special adaptive features evolved in parasites for their parasitic mode of life. (All India 2015C)
Question 5.
(i) What is ‘population’ according to you as a biology student?
(ii) ‘The size of a population for any species is not a static parameter’. Justify the statement with specific reference to fluctuations in the population density of a region in a given period of time. (Delhi 2019)
Question 6.
(i) Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
(a) Regulate
(b) Conform
(c) Migrate
(d) Suspend
(ii) If 8 individuals in a population of 80 butterflies die in a week, calculate the death of population of butterflies during that period. (2018)
Question 7.
(i) ‘Organisms may be conformers or regulators.’ Explain this statement and give one example of each.
(ii) Why are there more conformer than regulators in the animal world? (All India 2017)
Question 8.
Why are mango trees unable to grow in temperate climate? (Outside Delhi 2016)
Question 9.
Plants that inhabit a rainforest are not found in a wetland. Explain. (Delhi 2016)
Question 10.
Why the plants that inhabit a desert are not found in a mangrove? Give reasons. (Delhi 2016C)
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Question 1.
Heat loss or heat gain depends upon the surface area of the organism’s body. Explain with the help of a suitable example. (All India 2016C)
Or
Why are small animals rarely found in the polar regions? Explain. (Foreign 2010)
Question 2.
During a school trip to ‘Rohtang Pass’, one of your classmate suddenly developed ‘altitude sickness’. But, he/she recovered after some time.
(i) Mention one symptom to diagnose the sickness.
(ii) What caused the sickness?
(iii) How could she/he recover by her/himself after some time? (Delhi 2016)
Question 3.
In certain seasons we sweat profusely, while in some other season we shiver. Explain. (Delhi 2016C)
Question 4.
Explain with the help of suitable examples the three different ways by which organisms overcome their stressful conditions lasting for short duration. (Delhi 2016)
Or
Explain by taking three different examples how do certain organisms pull through the adverse conditions when unable to migrate under stressful period. (Delhi 2016C)
Question 5.
Why are certain organisms called regulators or conformers? Explain with the help of one example of each. (All India 2016C)
Question 6.
Provide an instance where the population size of species can be estimated indirectly, without actually counting them or seeing them. (Delhi 2016C)
Question 7.
Name the interaction that exists between sucker fish and shark. (Delhi 2016C)
Or
Name the type of interaction that exists between barnacles and whale. (Delhi 2015C)
Question 8.
Explain brood parasitism with the help of an example. (Delhi 2016C; 2013C)
Question 9.
Explain Gause’s competitive exclusion principle with the help of a suitable example. (All India 2016C)
Question 10.
Predation is usually referred to as a detrimental association. State any three positive roles that a predator plays in an ecosystem. (All India 2016)
Or
What is ‘predation’? Explain with the help of suitable examples why is it required in a community with rich biodiversity. (All India 2015C)
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Other CBSE Class 12th Biology Chapter Wise Questions
