MCQ
Given below is one of the types of ecological pyramids This type represents


- APyramid of numbers in a grassland
- BPyramid of biomass in a fallow land
- ✓Pyramid of biomass in a lake
- DEnergy pyramid in a spring

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$I.$ People should get vaccination to avoid infection
$II.$ Vaccination is available against polio, cholera, typhoid, tuberculosis and many othe disease
$III.$ Eradication of vectors are necessary in diseases like malaria and filariasis
$IV. $ Dengue and chikengunya, both are spread by Culex mosquitoes
Which of the statements given above are correct?