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Organisms and Populations · Question 36

NEET 2018MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(1) pre-reproductive individuals are more than the reproductive individuals

Solution

As per NCERT, the age pyramid of a population shows its growth status.

Growing (expanding) population: triangular pyramid with a broad base, i.e. pre-reproductive individuals are more than reproductive individuals.

Stable population: bell-shaped pyramid (pre-reproductive ≈ reproductive).

Declining population: urn-shaped pyramid (pre-reproductive fewer than reproductive).

Answer: (1)

NEET 2018

Keep practising — Organisms and Populations

2

Asymptote in a logistic growth curve is obtained when :

  1. K > N
  2. The value of 'r' approaches zero
  3. K < N
  4. K = N
NEET 2017
3

Plants which produce characteristic pneumatophores and show vivipary belong to :

  1. Halophytes
  2. Psammophytes
  3. Hydrophytes
  4. Mesophytes
NEET 2017
4

Mycorrhizae are the example of :

  1. Fungistasis
  2. Antibiosis
  3. Mutualism
  4. Amensalism
NEET 2017
5

It is much easier for a small animal to run uphill than for a large animal, because -

  1. The efficiency of muscles in large animals is less than in the small animals
  2. Smaller animals have a higher metabolic rate
  3. It is easier to carry a small body weight
  4. Small animals have a lower O2 requirement
NEET 2016 (Phase 1)
6

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 death rate is greater than birth rate.
  2. When N/K equals zero.
  3. When N/K is exactly one.
  4. When N nears the carrying capacity of the habitat.
NEET 2016 (Phase 1)
7

Gause's principle of competitive exclusion states that -

  1. Larger organisms exclude smaller ones through competition
  2. More abundant species will exclude the less abundant species through competition
  3. Competition for the same resources excludes species having different food preferences
  4. No two species can occupy the same niche indefinitely for the same limiting resources
NEET 2016 (Phase 1)
8

Which of the following is correct for r-selected species ?

  1. Small number of progeny with small size
  2. Small number of progeny with large size
  3. Large number of progeny with small size
  4. Large number of progeny with large size
NEET 2016 (Phase 2)
9

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

  1. parasitism
  2. commensalism
  3. mutualism
  4. amensalism
NEET 2016 (Phase 2)
10

The principle of competitive exclusion was stated by

  1. MacArthur
  2. G. F. Gause
  3. Verhulst & Pearl
  4. C. Darwin
NEET 2016 (Phase 2)
11

In which of the following interactions both partners are adversely affected?

  1. Competition
  2. Predation
  3. Mutualism
  4. Parasitism
AIPMT 2015

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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
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