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Organisms and Populations · Question 47

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 100% papers+4−1
1

The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that: [figure]

  1. Population B competed more successfully for food than population A
  2. Population A consumed the members of population B
  3. Both plant populations in this habitat decreased
  4. Population A produced more offspring than population B

Answer

(1) Population B competed more successfully for food than population A

Solution

∵ Both A and B are herbivores in the same grassy field ⇒ they use the same limited resource (grass) and compete with each other.

⇒ In the graph, population B rises while population A falls at the same time.

As per NCERT (Gause's competitive exclusion principle), two closely related species competing for the same resources cannot co-exist indefinitely, and the competitively inferior one will be eliminated eventually.

∴ Population B competed more successfully for food than population A.

(Option 2 is wrong because both are herbivores, so A cannot feed on B; option 3 would make both populations fall; option 4 would make A rise.)

Answer: (1)

AIPMT 2015 (Cancelled)

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2

Most animals are tree dwellers in a:

  1. temperate deciduous forest
  2. tropical rain forest
  3. coniferous forest
  4. thorn woodland
AIPMT 2015 (Cancelled)
3

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

  1. Keoladeo National Park
  2. Meghalaya
  3. Corbett National Park
  4. Western Ghat
AIPMT 2014
4

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

  1. Commensalism
  2. Amensalism
  3. Ectoparasitism
  4. Symbiosis
NEET 2013
5

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

  1. 15
  2. 05
  3. 10
  4. zero
NEET 2013
6

The age pyramid with broad base indicates :

  1. high percentage of young individuals
  2. high percentage of old individuals
  3. a stable population
  4. low percentage of young individuals
NEET 2013 (Karnataka)
7

Which one of the following is not a parasitic adaptation ?

  1. Loss of digestive organs
  2. Loss of unnecessary sense organs
  3. Development of adhesive organs
  4. Loss of reproductive capacity
NEET 2013 (Karnataka)
8

Benthic organisms are affected most by :

  1. Surface turbulence of water
  2. Water-holding capacity of soil
  3. Light reaching the forest floor
  4. Sediment characteristics of aquatic ecosystems
NEET 2013 (Karnataka)
9

Cuscuta is an example of :

  1. Ectoparasitism
  2. Predation
  3. Endoparasitism
  4. Brood parasitism
AIPMT 2012 (Mains)
10

People who have migrated from the plains to an area adjoining Rohtang Pass about six months back

  1. have more RBCs and their haemoglobin has a lower binding affinity to O2
  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 their haemoglobin has very high binding affinity to O2.
AIPMT 2012 (Prelims)
11

The logistic population growth is expressed by the equation:

  1. dt/dN = Nr ( K-NK )
  2. dN/dt = rN ( K-NK )
  3. dN/dt = rN ( N-KN )
  4. dN/dt = rN
AIPMT 2011 (Mains)

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
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