70 public questions tagged with this topic.
The population explosion in India is primarily due to a decreased infant mortality rate and an increased life expectancy. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
An inverted age pyramid indicates a declining population, with a higher number of post-reproductive individuals and fewer young individuals. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -
When a population reaches carrying capacity, growth slows due to limited resources and increased competition.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Competition - Competitive Exclusion
Age structure determines the proportion of individuals capable of reproduction, influencing population growth rate.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Hurricanes and other natural disasters affect populations regardless of their density, making them density-independent factors.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Earthquakes are density-independent because they impact populations regardless of their size.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Interactions - Predation and Herbivory
Logistic growth slows as a population nears carrying capacity due to increased competition and limited resources.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
Logistic growth is represented by an S-shaped curve, where population growth slows as it nears carrying capacity.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
Exponential growth occurs when resources are abundant, allowing populations to grow without limits.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
Age structure helps predict future population growth by showing the proportion of individuals in reproductive and pre-reproductive stages.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
The logistic growth equation accounts for limited resources, with growth slowing as population nears carrying capacity (K).
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
The equation dN/dt = rN represents exponential growth, where population increases rapidly without resource limitations.
Ref: NCERT Class 12 Biology Chapter 11: Organisms and Populations Population Growth - Exponential and Logistic Models
