MCQ
Which of the following statements is correct?
- AParthenium is an endemic species of our country.
- BAfrican catfish is not a threat to indigenous catfishes.
- CSteller’s sea cow is an extinct animal.
- DLantana is popularly known as carrot grass.
Explanation:
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| Column $-I$ | Column $-II$ |
| $(A)$ Physical barriers | $(1)$ Interferon |
| $(B)$ Physiological barriers | $(2)$ Leukocytes |
| $(C)$ Cellular barriers | $(3)$ Tears |
| $(D)$ Cytokinin barriers | $(4)$ skin |
$A$ $B$ $C$ $D$
Fill the correct option for $A$ and $B$
$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.
$(2)$ Decomposition is largely an oxygen requiring process.
$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.
$(4)$ The amount of energy decreases in each successive trophic level.