MCQ
Zero growth of population is indicated by
- ALess number of child birth
- BLess number of reproductive females
- ✓Reproductive individual are equal to pre-reproductive individuals
- DLess number of male then females
Age pyramid Graphic representation of different age groups found in a population with pre-reproductive group at the base. Reproductive ones in the middle and post-reproductive group at the top is called age pyramid.
Age pyramid have three kinds
$(i)$ Triangular Age Pyramid The number of pre-reproductive is very large. Number of reproductive individual is moderate and postreproductive are fewer. Population size is growing
$(ii)$ Bell-shaped Age Pyramid The number of prereproductive and reproductive individuals is almost equal. Post-reproductive individuals are comparatively fewer. Population size is stable
$(iii)$ Urn-shaped Age Pyramid Proportion of reproductive age group is higher than the individuals in pre-reproductive age group. Number of post-reproductive individuals is also sizable. It is declining population with negative growth
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$I.$ In a population, birth rate and death rate refer to per capita births and death respectively
$II.$ In nature, we rarely find isolated single individuals of any species
$III.$ The size of population for any species is stable phenomena
$IV.$ Ecological effects of any factors on a population growth are generally reflected in its size/population density
Reason : Flower colour gene shows incomplete dominance.
Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.