Organisms & Populations PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Organisms & Populations · Set 1 (Q1-25)
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1. $In the exponential growth equation N_{t} = N_{0} e^{r t}, e represents:$ (1) $The base of number logarithms$ (2) $The base of exponential logarithms$ (3) $The base of natural logarithms$ (4) $The base of geometric logarithms$ 2. $The impact of immigration on population density is :-$ (1) $Negative$ (2) $Both positive and negative$ (3) $Neutralized by natality$ (4) $Positive$ 3. $When does the growth rate of a population following the logistic model equal zero ? The logistic model is given as dN/dt = rN (1-N/K) :-$ (1) $when N/K is exactly one.$ (2) $when N nears the carrying capacity of the habitat.$ (3) $when N/K equals zero.$ (4) $when death rate is greater than birth rate.$ 4. $In the exponential growth equation N_{t} = N_{o} e^{rt}, e represents:$ (1) $The base of exponential logarithms$ (2) $The base of natural logarithms$ (3) $The base of geometric logarithms$ (4) $The base of number logarithms$ 5. $Which of the following is not an attribute of a population?$ (1) $Species interaction$ (2) $Sex ratio$ (3) $Natality$ (4) $Mortality$ 6. $The logistic population growth is expressed by the equation$ (1) $dt / dN = Nr (\frac{K - N}{K})$ (2) $dN / dt = rN (\frac{K - N}{K})$ (3) $dN / dt = rN$ (4) $dN / dt = rN N-KN$ 7. $If ‘+’ sign is assigned to beneficial interaction, ‘-’ sign to detrimental and ‘0’ sign to neutral interaction, then the population interaction represent by ‘+’ ‘-’ refers to$ (1) $Amensalism$ (2) $Commensalism$ (3) $Parasitism$ (4) $Mutualism$ 8. $People who have migrated from the planes to an area adjoining Rohtang Pass about six months back$ (1) $Have more RBCs and their haemoglobin has a lower binding affinity to O_{2} .$ (2) $Are not physically fit to play games like football.$ (3) $Suffer from altitude sickness with symptoms like nausea, fatigue, etc.$ (4) $Have the usual RBC count but then haemoglobin has very high binding affinity to O_{2} .$ 9. $Asymptote in a logistic growth curve is obtained when :$ (1) $K = N$ (2) $K > N$ (3) $K < N$ (4) $The value of 'r' approaches zero$ 10. $If '8' Drosophila in a laboratory populationof '80' died during a week, the death rate in the population is___________individuals per Drosophila per week.$ (1) $10$ (2) $1.0$ (3) $zero$ (4) $0.1$ 11. $It is much easier for a small animal to run uphill than for animal, because:$ (1) $It is easier to carry a small body weight$ (2) $Smaller animals have a higher metabolic rate$ (3) $Small animals have a lower O_{2} requirement$ (4) $The efficiency of muscles in large animals is less than in the small animals$ 12. $Consider the following four conditions (A-D) and select the correct pair of them as adaptation to environment in desert lizards. The conditions: (A) Burrowing in soil to escape high temperature. (B) Losing heat rapidly from the body during high temperature. (C) Bask in sun when temperature is low. (D) Insulating body due to thick fatty dermis.$ (1) $(A) and (C)$ (2) $(B) and (D)$ (3) $(A) and (B)$ (4) $(C) and (D)$ 13. $The process of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is referred as :$ (1) $Emigration$ (2) $Competition$ (3) $Immigration$ (4) $Association$ 14. $Which of the following flowers only once in its life-time?$ (1) $Bamboo species$ (2) $Jackfruit$ (3) $Mango$ (4) $Papaya$ 15. $A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is$ (1) $Ectoparasitism$ (2) $Symbiosis$ (3) $Commensalism$ (4) $Amensalism$ 16. $A population with finite resources shows a logistic growth curve where the correct sequence of events will be :$ (1) $Acceleration phase \to Deceleration \to Asymptote$ (2) $Acceleration phase \to Lag phase \to Stationary phase$ (3) $Lag phase \to Acceleration phase \to Deceleration \to Asymptote$ (4) $Stationary phase \to Acceleration phase \to Lag phase \to Asymptote$ 17. $When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K):$ (1) $When N/K is exactly one$ (2) $When N nears the carrying capacity of the habitat$ (3) $When N/K equals zero$ (4) $When dearth rate is greater than birth rate$ 18. $If a pond has 40 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 48, what will be the birth rate?$ (1) $0.6 offspring per lotus per year$ (2) $0.5 offspring per lotus per year$ (3) $0.2 offspring per lotus per year$ (4) $0.1 offspring per lotus per year$ 19. $A biologist studied the population of eats in a barn. He found that the average natality was 250, average mortality is 240, immigration is 20 and emigration to be 30. The net increase in population is$ (1) $10$ (2) $15$ (3) $05$ (4) $Zero$ 20. $Which one of the following is categorized as a parasite in true sense?$ (1) $Human foetus developing inside the uterus draws nourishment from the mother.$ (2) $Head louse living on the human scalp as well as laying eggs on human hair.$ (3) $The cuckoo (koel) lays its eggs in crew’s nest.$ (4) $The female Anopheles bites and sucks blood from humans.$ 21. $Leaves become modified into spines in$ (1) $Opuntia$ (2) $Pea$ (3) $Onion$ (4) $Skin cotton$ 22. $In a growing population of a country$ (1) $pre-reproductive individuals are more than the reproductive individuals.$ (2) $reproductive individuals are less than the post-reproductive individuals.$ (3) $reproductive and pre-reproductive individuals are equal in number.$ (4) $pre-reproductive individuals are less than the reproductive individuals.$ 23. $Amensalism can be represented as:$ (1) $Species A (+); Species B (+)$ (2) $Species A (-); Species B (-)$ (3) $Species A (+); Species B (0)$ (4) $Species A (-) : Species B (0)$ 24. $Cuscuta is an example of$ (1) $Brood parasitism$ (2) $Predation$ (3) $Endoparasitism$ (4) $Ectoparasitism$ 25. $Natality refers to$ (1) $Death rate$ (2) $Birth rate$ (3) $Number of individuals leaving the habitat$ (4) $Number of individuals entering a habitat$