Biology MCQs

Saltwater ocean and sea are the largest ecosystems on earth

Saltwater ecosystem covers about 75% earth surface

Freshwater ecosystem covers less than 1% of earth surface

Its temperature is more moderate to support life

Number of plants in that ecosystem

The density of that ecosystem

Consumption of carbon dioxide and evolve of oxygen

Both a and b

Limnetic zone

Littoral zone

Profundal zone

All of these

Plants are unable to anchor but enough light penetrates to support photosynthesis

Phytoplanktons in this region are cyanobacteria

Decomposers and detritus feeders inhabit it

Water lilies are abundant

The process of decreasing nutrients by human activities

Adequate nutrition accelerated by human activities

Changing the trophic levels of an ecosystem by human activities

Addition of more predators in an ecosystem