MCQ Questions for Class 12 Biology Chapter 13 Organisms and Populations with Answers

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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