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STD 12 - 11. organisms and populations — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 11. organisms and populations1 Mark
MCQ
Population termed $r$ - strategists
  • ✓
    Have $J$ - shaped growth curves
  • B
    Have type $III$ survivorship curves
  • C
    Are usually pioneer species
  • D
    All of these
✓

Answer

Correct option: A.
Have $J$ - shaped growth curves
a
(a) During short period of time, some population produce many offsprings which require little care. Therefore, these populations usually have a survivorship curve similar to type $III$.

These tend to have $J$-shaped growth curves until some environmental change causes them to decline usually with in a short time. From an evolutionary point of view, such species have undergone selection to maximize their rate of natural increase and for this reason they are termed as $r$-trategies.

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