MCQ
Which weed has been eradicated by biological control?
- AParthenium
- BCactus
- CEichhornia
- DChrysanthemum
Explanation:
Cactus was the plant which had beautiful flowers and grows very rapidly. This property of the plant was used to decorate the fences or use the plant as hedges in agricultural land sand farms. The plant has been eradicated by the method of biological control. It was done by introducing the cochineal insect Cactoblastis Cactorum. The insect is a type of moth which exceptionally feeds on the cactus plant. Biological control is a method of controlling pests by using microbes and it is based on the the natural predation or parasitism.
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$(A)$ Some snails go into _____$(i)$_____ to avoid ____$(ii)$_____ related problems.
$(B)$ Since small animals have a ____$(iii)$___ surface area relative to their volume, they tend to lose body heat
_____$(iv)$______ when it is cold outside.
$(C)$ Next to temperature, _____$(v)$____ is the most ecologically important environmental factor.
$(D)$ Every ____$(vi)$____ the famous Keolado National Park in Rajasthan host thousands of migrating birds.
Which one of the following option gives the correct fill ups for the respective blank numbers from $(i)$ to $(vi)$ in
the statements?