Age pyramidsआयु पिरामिड

NCERT Fig 11.1 · Class 12 Biology · Chapter 11 · interactive diagram

Parts and their functions

• Expanding (growing) population (वर्धनशील समष्टि) — Very broad base: many pre-reproductive (young) individuals → the population is growing.
• Stable population (स्थिर समष्टि) — Bell shape: pre-reproductive and reproductive groups are about equal → the size stays nearly the same.
• Declining population (ह्रासमान समष्टि) — Narrow base (urn shape): fewer young than reproductive individuals → the population is shrinking.
• Pre-reproductive (जनन-पूर्व) — Young individuals not yet able to reproduce.
• Reproductive (जननशील) — Individuals in the reproductive age group.
• Post-reproductive (जनन-पश्च) — Older individuals past reproductive age.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 11.1. Report a mistake