Students are advised to practice the NCERT MCQ Questions for Class 12 Biology Chapter 13 Organisms and Populations with Answers Pdf free download is available here. MCQ Questions for Class 12 Biology with Answers are prepared as per the Latest Exam Pattern. Students can solve these Organisms and Populations Class 12 MCQs Questions with Answers and assess their preparation level.
Organisms and Populations Class 12 MCQs Questions with Answers
Solving the Organisms and Populations Multiple Choice Questions of Class 12 Biology Chapter 13 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Organisms and Populations Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 13 Biology Class 12 and cross-check your answers during preparation.
Select the correct answer
Question 1.
Autecology is the
(a) relation of a population to its environment
(b) relation of an individual to its environment
(c) relation of a community to its environment
(d) relation of a biome to its environment.
Answer
Answer: (b) relation of an individual to its environment
Question 2.
Ecotone is:
(a) A polluted area
(b) The bottom of a lake
(c) A zone of transition between two communities
(d) A zone of developing community.
Answer
Answer: (c) A zone of transition between two communities
Question 3.
Biosphere is:
(a) A component in the ecosystem
(b) Composed of the plants present in the soil
(c) Life in the outer space
(d) Composed of all living organisms present on the earth which interact with the physical environment.
Answer
Answer: (d) Composed of all living organisms present on the earth which interact with the physical environment.
Question 4.
Ecological niche is:
(a) the surface area of the ocean
(b) a an ecologically adapted zone
(c) the physical position and functional role of a species within the community
(d) formed of all plants and animals living at the bottom of a lake.
Answer
Answer: (c) the physical position and functional role of a species within the community
Question 5.
According to Allen’s Rule, the mammals from colder climates have:
(a) shorter ears and longer limbs
(b) longer ears and shorter limbs
(c) longer ears and longer limbs
(d) shorter ears and shorter limbs.
Answer
Answer: (d) shorter ears and shorter limbs.
Question 6.
Salt concentration (salinity) of the sea measured in parts per thousand is:
(a) 10-15
(b) 30-70
(c) 0-5
(d) 30-35.
Answer
Answer: (d) 30-35.
Question 7.
Formation of tropical forests needs mean annual temperature and mean annual precipitation as:
(a) 18-25°C and 150-400 cm
(b) 5-15°C and 50-100 cm
(c) 30-50°C and 100-150 cm
(d) 5-15°C and 100-200 cm.
Answer
Answer: (a) 18-25°C and 150-400 cm
Question 8.
Which of the following forest plants controls the light conditions at the ground?
(a) Lianas and climbers
(b) Shrubs
(c) Tall trees
(d) Herbs.
Answer
Answer: (c) Tall trees
Question 9.
What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?
(a) It will grow normally
(b) It will grow well because it is planted in the same locality
(c) It may not survive because of change in its microclimate
(d) It grows very well because the plant gets more sunlight.
Answer
Answer: (c) It may not survive because of change in its microclimate
Question 10.
If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of population?
(a) 50 per hour
(b) 200 per hour
(c) 5 per hour
(d) 100 per hour.
Answer
Answer: (d) 100 per hour.
Question 11.
What would be the per cent growth or birth rate per individual per hour for the same population mentioned in the previous question?
(a) 100
(b) 200
(c) 50
(d) 150.
Answer
Answer: (b) 200
Question 12.
A population has more young individuals compared to the older individuals. What would be the status of the population after some years?
(a) It will decline.
(b) It will stabilise.
(c) It will increase.
(d) It will first decline and then stabilise.
Answer
Answer: (c) It will increase.
Question 13.
What parameters are used for tiger census in our country’s national parks and sanctuaries?
(a) Pugmarks only
(b) Pug marks and faecal pellets
(c) Faecal pellets only
(d) Actual head counts.
Answer
Answer: (b) Pug marks and faecal pellets
Question 14.
Which of the following would necessarily decrease the density of a population in a given habitat?
(a) Natality > mortality
(b) Immigration > emigration
(c) Mortality and emigration
(d) Natality and immigration.
Answer
Answer: (c) Mortality and emigration
Question 15.
A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?
(a) 128
(b) 24
(c) 64
(d) 32.
Answer
Answer: (c) 64
Question 16.
In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:
(a) 25 millions
(b) 17 millions
(c) 20 millions
(d) 18 millions.
Answer
Answer: (b) 17 millions
Question 17.
Amensalism is an association between two species where :
(a) one species is harmed and other is benefitted
(b) one species is harmed and other is unaffected
(c) one species is benefitted and other is unaffected
(d) both the species are harmed.
Answer
Answer: (b) one species is harmed and other is unaffected
Question 18.
Lichens are the associations of:
(a) bacteria and fungus
(b) algae and bacterium
(c) fungus and algae
(d) fungus and virus.
Answer
Answer: (c) fungus and algae
Question 19.
Which of the following is a partial root parasite?
(a) Sandal wood
(b) Mistletoe
(c) Orobanche
(d) Ganoderma.
Answer
Answer: (b) Mistletoe
Question 20.
Which one of the following organisms reproduces sexually only once in its life time?
(a) Banana plant
(b) Mango
(c) Tomato
(d) Eucalyptus.
Answer
Answer: (a) Banana plant
Assertion and Reason Type Questions
The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false.
Question 21.
Assertion: In India, the human population is currently undergoing the lag phase.
Reason: 90% portion of Indian population is still below poverty line.
Answer
Answer: (d) Both assertion and reason are false.
Question 22.
Assertion: Gene flow increases genetic variations.
Reason: The random introduction of new alleles into recipient population and their removal from the donor population affect allele frequency.
Answer
Answer: (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
Question 23.
Assertion: Smaller the organism, the higher is the rate of metabolism per gram weight.
Reason: The heart rate of a six-month baby is much higher than that of an old person.
Answer
Answer: (a) Both assertion and reason are true and reason is the correct explanation of assertion.
Question 24.
Assertion: Allelopathy is a form of ammensalism that occurs in plants.
Reason: Association of rooting plants with fungal hyphae, is an important example of ammensalism.
Answer
Answer: (c) Assertion is true but reason is false.
Question 25.
Assertion: Animals adopt different strategies to survive in hostile environment.
Reason: Praying mantis is green in colour which merges with plant foliage.
Answer
Answer: (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
Question 26.
Assertion: Age-sex structure of human population in France and Sweden forms a steep pyramid.
Reason: In countries like Sudan and India, the population is increasing at a rapid rate.
Answer
Answer: (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
Question 27.
Assertion: Cold-blooded animals have no fat layer.
Reason: Cold-blooded animals use their fat for metabolic processes during hibernation.
Answer
Answer: (b) Both assertion and reason are true but reason is not the correct explanation of assertion.
Question 28.
Assertion: Migration is an important factor which determines both population size and population density.
Reason: In migration, a major part of population goes from one area to another area.
Answer
Answer: (a) Both assertion and reason are true and reason is the correct explanation of assertion.
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