Home ยป Organisms and Populations Class 12 Biology MCQ With Solutions

Organisms and Populations Class 12 Biology MCQ With Solutions

Update on: 02 Feb 2024, 10:55 AM

Organisms and Populations Class 12 Biology MCQ with Answers has been organized according to the latest exam pattern in the CBSE Class 12 Biology syllabus for the upcoming CBSE Class 12 Biology Exam. Organisms and Populations cover topics like population attributes and population growth, population interactions, These questions are designed to help students understand the concept thoroughly. They are helpful for revision and for grasping the concepts effectively. These MCQ questions cover in-text book questions and important topics to help students assess their preparation level for CBSE board exams.

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CBSE Class 12 Chapter 11 Organisms and Populations MCQs

Check below theย MCQ Questions for class 12 Biology with answers and Clear your idea of Chapter 11 Organisms and Populations.

Q.1. Select the incorrect match.

(a) Euryhaline- Salmon
(b) Stenohaline- Shark
(c) Stenothermal- Picea
(d) Eurythermal- Abies

Answer
(d): Abies is stenothermal.

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Q.2. A biologist studied the population of mice in a particular area. He found that the average natality was 500, average mortality 480, immigration 40 and emigration 60. The net increase in population is

(a) 10 (b) 30
(c) 0 (d) 20

Answer
(c): The increase in population size is
Natality + Immigration= 500 +40 = 540
The population decline is
Mortality + Emigration = 480 + 60 = 540
Thus, net increase in population = 540 โ€“ 540 = 0

 

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Q.3. The value of (r) for flour beetle is

(a) 0.015 (b) 0.12
(c) 0.5 (d) 0.081.

Answer

(b)

 

Q.4. A protozoan reproduces by binary fission. What will be the number of protozoans in its population after four generations?

(a) 16 (b) 32
(c) 64 (d) 8

Answer
(a): By binary fission, an individual protozoan will divide in two. In this way after four generation their number will be 16

 

Q.5.ย  Select the type of biotic interactions with example, in which one of the interacting species is benefited while other remains unaffected.

(a) Commensalism- Epiphyte on mango branch
(b) Mutualism- Orchid Ophrys and bee
(c) Amensalism- Balanus and Chthamalus
(d) Parasitism โ€“ Ticks on dogs

Answer
(a): In commensalism one of the interacting species is benefitted while other remains unaffected. In mutualism both the interacting species are benefitted, amensalism one of the interacting species is harmed while other remains unaffected. parasitism one of the interacting species is benefitted whereas other is harmed.

 

Q.6. Which of the following is the correct example of positive interaction in a population?

(a) Adamsia – Hermit crab
(b) Plasmodium – Mosquito
(c) Sacculina – Crab
(d) Wuchereria โ€“ Man

Answer
(a)

 

Q.7. Which of the following shows Verhulst-Pearl logistic growth?

(a) dN/dt= rN (K-N)/K
(b) dN/dt= rN
(c) Nt= N0ert
(d) rN K-N/K

Answer
(a): Verhulst Pearl logistic growth is described by
dN/dt = rn(K – N/K)
Where N is population density at time t , r intrinsic rate of natural increase and K is carrying capacity.

 

Q.8. In which of the following types of interactions both the interacting organisms are harmed?

(a) Parasitism (b) Protocooperation
(c) Mutualism (d) Competition

Answer
(d)

 

Q.9. In the exponential growth equation Nt = N0ert, e represents

(a) the base of geometric logarithms
(b) the base of number logarithms
(c) the base of exponential logarithms
(d) the base of natural logarithms.

Answer
(d): In the exponential growth equation, Nt = N0ert. Here e is base of natural logarithms (2.71828).

 

Q.10. Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

(a) Predation
(b) Resource partitioning
(c) Competitive release
(d) Mutualism

Answer
(b): If two species compete for the same resource, they could avoid competition by choosing different times for feeding or different foraging patterns. This is called resource partitioning.

 

We hope the MCQs for the CBSE Class 12 Biology Chapter 11 onย  Organisms and Populations are helpful for your board exam preparation.

Keep learning and stay updated with us for more CBSE exam updates.


 

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