Chapter 13 on "Organisms and Populations" is a crucial part of the NEET syllabus. It covers important concepts related to organisms and their interactions within populations. Students aiming to excel in the NEET exam must thoroughly study and understand the concepts from this chapter.
It forms a significant portion of the exam syllabus. To assist you in your preparation, we've selected 10+ Important NEET Questions on Class 12 Chapter 13 Organisms and Populations from this chapter.
These organisms and population's neet questions have appeared in previous NEET and other medical exams, making them highly relevant for your studies.
By focusing on these organisms and population's neet questions pdf and understanding the underlying concepts, you'll be better equipped to tackle similar questions in the NEET exam. Let's delve into these questions to strengthen your grasp of Chapter 13 and boost your readiness for the upcoming exam!
10+ Organisms and Populations NEET Questions PYQ
1. Given below are two statements: (NEET-2023)
Statement I: Gause’s ‘Competitive Exclusion Principle’ states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II: In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:
A. Both Statement I and Statement II are false.
B. Statement I is correct Statement II is false.
C. Statement I is incorrect but Statement II is true.
D. Both Statement I and Statement II are true.
Answer: B. Statement I is correct Statement II is false.
Explanation: Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and the competitively inferior one will be eliminated eventually. Thus, statement I is correct, and Statement II is incorrect as in general, herbivores and plants appear to be more adversely affected by competition than carnivores.
Read: Biotechnology MCQ
2. Which one of the following statements cannot be connected to Predation? (NEET 2022 Phase 1)
A. It helps in maintaining species diversity in a community
B. It might lead to extinction of a species
C. Both the integrating species are negatively impacted
D. It is necessitated by nature to maintain the ecological balance
Answer: C. Both the integrating species are negatively impacted
Explanation: One of the species in predation gains benefit on the expense of the other. Predators help in maintaining species diversity in a community, by reducing the intensity of competition among competing prey species. If a predator is too efficient and overexploits its prey, then the prey might become extinct.
3. Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival? (NEET 2021)
A. Predation
B. Resource partitioning
C. Competitive release
D. Mutualism
Answer: Both the integrating species are negatively impacted
Explanation: Inspite of interspecific competition the competing species may co-exist by doing resource partitioning, In mutualism two organisms are equally benefitted, In predation one organism (Predator) eats the another one (Prey), In competition release there occurs dramatical increase in population of a less distributed species when its superior competitor is removed.
4. Just as a person moving from Delhi to Shimla to escape the heat for the duration of the hot summer, thousands of migratory birds from siberia and other extremely cold northern regions move to (NEET – 2014)
A. Keoladeo National Park
B. Corbett National Park
C. Western Ghats
D. Meghalaya
Answer: A. Keoladeo National Park
Explanation: Keoladeo National Park, located in Bharatpur, Rajasthan, is a renowned bird sanctuary where migratory birds from Siberia and other northern regions visit during winter to escape the extreme cold.
5. A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality was 240, immigration 20 and emigration 30. The net increase in population is _____ (NEET – 2013)
A. 0
B. 5
C. 10
D. 15
Answer: C. 10
Explanation: Net increase in population = (Natality + Immigration) - (Mortality + Emigration)
= (250 + 20) - (240 + 30)
= 270 - 270
= 10
6. A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is_____ (NEET – 2013)
A. Symbiosis
B. Amensalism
C. Ectoparasitism
D. Commensalism
Answer: D. Commensalism
Explanation: The association between a sedentary sea anemone and a hermit crab, where the anemone benefits by hitching a ride on the crab's shell without harming or benefiting the crab, represents commensalism.
7. Which of the following is categorized as a parasite in true sense? (NEET – 2011 )
A. The cuckoo lays its egg in crows nest
B. Human foetus developing inside the uterus draws nourishment from the mother
C. The female anopheles bites and sucks blood from humans
D. House louse living on the human scalp as well as laying eggs on human hair
Answer: D. House louse living on the human scalp as well as laying eggs on human hair
Explanation: House louse represents a true parasite as it lives on the human scalp, feeds on blood, and lays eggs in human hair, directly benefiting at the expense of the host.
8. The population of an insect species shows an explosive increase in numbers during the rainy season followed by its disappearance at the end of the season. What does this show? (NEET AIPMT – 2007)
A. S-shaped or sigmoid growth of this insect
B. The population of its predators increases enormously
C. The food plants mature and die at the end of the rainy season
D. Its population growth curve is of J-type
Answer: D. Its population growth curve is of J-type
Explanation: The explosive increase in the population of an insect during the rainy season followed by disappearance suggests a J-shaped population growth curve, characterized by rapid growth and subsequent decline due to limited resources or environmental factors.
9. The geometric representation of age structure is a characteristic of _____ (NEET AIPMT – 2007)
A. Ecosystem
B. Landscape
C. Population
D. Biotic community
Answer: C. Population
Explanation: The geometric representation of age structure is a characteristic of population ecology, reflecting the distribution of individuals in different age groups within a population.
10. A high density of elephant population in an area can result in: (NEET AIPMT – 2007)
A. Predation on one another
B. Interspecific competition
C. Mutualism
D. Intraspecific competition
Answer: D. Intraspecific competition
Explanation: A high density of elephant population in an area can result in intraspecific competition, where individuals compete for limited resources such as food, water, and space within the same species.
11. Praying mantis is a good example of____ (NEET AIPMT – 2006 )
A. Camouflage
B. Mullerian Mimicry
C. Warning coloration
D. Social insects
Answer: A. Camouflage
Explanation: Praying mantis exhibits camouflage, blending with its environment to avoid detection by predators or prey.
12. The formula for exponential population growth is______ (NEET AIPMT – 2006 )
A. dN/rN =dt
B. dt/dN = rN
C. dN/dt = rN
D. rN/dN =dt
Answer: C. dN/dt = rN
Explanation: The formula for exponential population growth is expressed as dN/dt = rN, where dN/dt represents the rate of change in population size over time, r is the intrinsic growth rate, and N is the population size.
13. Annual migration does not occur in the case of ____ (NEET AIPMT – 2006)
A. Arctic tern
B. Salamander
C. Salmon
D. Siberian crane
Answer: B. Salamander
Explanation: Salamanders do not exhibit annual migration as seen in some bird species (e.g., Arctic tern), fish (e.g., salmon), or birds (e.g., Siberian crane).