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Q. No.A person is brought to high altitude (5000m above sea level). After a few days of acclimatisation, which of the following compensatory changes would you expect?
1. Increased RBC count and increased 2,3-BPG leading to decreased binding affinity of haemoglobin for O₂
2. Decreased RBC count and decreased binding affinity of haemoglobin for O₂
3. Decreased respiratory rate and increased tidal volume
4. Increased dead space volume and decreased alveolar ventilation
1. Increased RBC count and increased 2,3-BPG leading to decreased binding affinity of haemoglobin for O₂
2. Decreased RBC count and decreased binding affinity of haemoglobin for O₂
3. Decreased respiratory rate and increased tidal volume
4. Increased dead space volume and decreased alveolar ventilation
Subtopic: Adaptations (OLD NCERT) |
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Level 2: 60%+
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A country shows a pyramid with a narrow base, nearly parallel sides for the reproductive group, and a wider top than middle. Which combination of demographic trends is MOST accurate?
1. High birth rate, high death rate, expanding population
2. Low birth rate, low death rate, stable population
3. Low birth rate, ageing population, declining growth
4. High birth rate, ageing population, stable growth
1. High birth rate, high death rate, expanding population
2. Low birth rate, low death rate, stable population
3. Low birth rate, ageing population, declining growth
4. High birth rate, ageing population, stable growth
Subtopic: Population Characters: Natality & Mortality | Population Attributes |
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In a closed population showing exponential growth, which change will NOT alter the shape (curvature) of the growth graph?
1. Doubling the initial population size
2. Changing r form 0.4 to 0.6
3. Lowering mortality
4. dding immigration and emigration
1. Doubling the initial population size
2. Changing r form 0.4 to 0.6
3. Lowering mortality
4. dding immigration and emigration
Subtopic: Population: Exponential Growth Model |
Level 4: Below 35%
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A researcher observes the following trends in a coastal ecosystem:
- A key predator (a crab species) is removed from the intertidal zone.
- Within a year, many smaller invertebrate species become extremely abundant.
- Soon after, several of these invertebrates begin to competitively exclude others, leading to a sharp decline in the number of species present.
- Plant biomass in the area begins to fluctuate wildly.
- Chemical defences of certain plant species increase as grazing pressure rises.
Which conclusion BEST fits the observations above?
1. Predators maintain species diversity by preventing any one prey species from outcompeting others.
2. Predators always decrease biodiversity by consuming many prey species.
3. Chemical defences in plants evolve only after complete predator removal.
4. Plant fluctuations occur only because predators normally perform photosynthesis.
- A key predator (a crab species) is removed from the intertidal zone.
- Within a year, many smaller invertebrate species become extremely abundant.
- Soon after, several of these invertebrates begin to competitively exclude others, leading to a sharp decline in the number of species present.
- Plant biomass in the area begins to fluctuate wildly.
- Chemical defences of certain plant species increase as grazing pressure rises.
Which conclusion BEST fits the observations above?
1. Predators maintain species diversity by preventing any one prey species from outcompeting others.
2. Predators always decrease biodiversity by consuming many prey species.
3. Chemical defences in plants evolve only after complete predator removal.
4. Plant fluctuations occur only because predators normally perform photosynthesis.
Subtopic: Population Interactions: Predation |
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Level 2: 60%+
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