Organisms and Populations
6 solved NEET Biology previous year questions on Organisms and Populations, each with the correct answer and a full explanation.
Q1
What type of human population is represented by the following age pyramid?
✓ Correct answer: c) Declining population
ExplanationA declining population is one where the birth rate is lower than the death rate, causing the population size to decrease over time.Its age pyramid has a narrower base compared to the middle or older age groups, showing fewer young individuals.
Q2
A biologist studied the population of rats in a barn. He found that the average natality was average mortality , immigration and emigration . The net increase in population is
✓ Correct answer: b) Zero
ExplanationGiven: Natality (Births, B) = 250 Mortality (Deaths, D) = 240 Immigration (I) = 20 Emigration (E) = 30 Formula: Substitution: Correct Answer: Option B — Zero
Q3
Study of inter-relationships between organisms and their environment is:
✓ Correct answer: a) Ecology
ExplanationEcology is basically concerned with four levels of biological organisation – organisms, populations, communities and biomes
Q4
In the exponential growth equation , e represents [NEET 2021]
✓ Correct answer: d) The base of natural logarithms
ExplanationIn the equation, ‘e’ represents the base of natural logarithms.It is used in exponential and logarithmic equations to describe continuous processes such as population growth or decay.Exponential growth is a type of population growth where the population increases at a constant rate per unit time, without any limitation of resources.
Q5
Inspite of interspecific competition in nature, by which mechanism the competing species might have evolved for their survival? [NEET 2021]
✓ Correct answer: b) Resource partitioning
ExplanationAlthough different species often compete for similar resources in nature, they can continue to exist together by developing strategies to use those resources in separate ways.This adaptive process is called resource partitioning.For example, two species of birds living on the same tree may avoid competition by feeding at different heights or on different types of insects.By dividing the habitat and resources, both species can survive without directly harming each other’s chances of survival.
Q6
What do ' ' and ' ' represent in the following population growth curve? [Re-NEET 2024]
✓ Correct answer: a) 'a' represents exponential growth when responses are not limiting the growth; and ' b ' represents logistic growth when responses are limiting the growth.
ExplanationCurve ‘a’ → Exponential Growth (dN/dt = rN) Fast, unrestricted growth No limiting factors (resources not limiting the population) J-shaped curve Curve ‘b’ → Logistic Growth (dN/dt = rN[(K– N)/K]) Growth slows as population approaches carrying capacity (K) Limiting factors (competition, resources) operate S-shaped (sigmoid) curve So the correct interpretation is: ‘a’ = exponential growth (no limiting factors) ‘b’ = logistic growth (limiting factors present) Hence, Option A is correct.
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