MCQ
Population termed $r$ - strategists
- ✓Have $J$ - shaped growth curves
- BHave type $III$ survivorship curves
- CAre usually pioneer species
- DAll of these
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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$I.$ Ladybirds and dragonflies are used to get rid of aphids and mosquitoes
$II.$ The bacteria Bacillus thuringiensis $(B t)$ are used to control butterfly caterpillars
$III.$ Trichoderma sp. free living fungi, are present in root ecosystems where they act against several plant pathogens
$IV.$ Rhizobium is a symbiotic bacterium that lives in the stem of legumes
Which of the statements given above are correct?
$(a)$ High fertility rate
$(b)$ Rapidly rising mortality rate
$(c)$ Very young age distribution
$(d)$ Rapid population growth
$(e)$ Rapidly falling mortality rate
$(f)$ Very old age distribution