MCQ
Sewage drained into water bodies kill fishes because:
- AExcessive carbon dioxide is added to water.
- BIt gives off a bad smell.
- CIt removes the food eaten by fish.
- ✓It increases competition with fishes for dissolved oxygen.
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| Column $- I$ | Column $- II$ |
| $(A)$ Physiological barrier | $(1)$ Skin |
| $(B)$ Cellular barrier | $(2)$ Macrophages |
| $(C)$ Physical barriers | $(3)$ interferons |
| $(D)$ Cytokine barriers | $(4)$ Tears |
| $(5)$ Mucus |
$I.$ 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