Arrange the following marine organisms in the order of increasing hierarchies in the food chain?

Consider the following statements. Coral reefs

1) Break the power of the waves during storms, cyclones and tsunamis

2) Form the spawning and nursery grounds for several fish species

3) Are being used in the treatment of cancer

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Smog severity in a region is often aggravated by

1) Stubble burning in neighbouring agricultural areas

2) Vehicular emissions

3) Persistent cold weather conditions with sunlight

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Photochemical smog consists of a mixture of air pollutants which may include

1) Sulphur oxides

2) Tropospheric ozone

3) Volatile organic compounds

4) Peroxyacyl nitrates

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Large scale deforestation in a forest can cause fertility of soil to decline. Why?

1) Soil can be leached easily due to heavy rain

2) Microbial activity in soil increases significantly

3) Nutrient content of the soil changes.

Select the correct answer using the codes below.