Oxygen forms ......... of the atmosphere.

Most organisms cannot use the free form of ................. .

Flow of energy in an ecosystem is............ .

Conversion of nitrogen compounds into gaseous nitrogen is called........ .

Carbon atoms are circulated and recycled through ............ .

The Indian Institute of Ecology and Environment, Delhi, has published........... .

The pattern of energy exchange in an ecosystem is called a ............... .

Find the odd man out: Nitrogen cycle, oxygen cycle, carbon cycle, phosphorus cycle.

.................. irst proposed the concept of Ecological Pyramid in 1927.

Oxygen is released in the process of

Find the odd man out: Photosynthesis, Nitrification, Ammonification, Denitrification.

Find the odd man out: Frog, Owl, Squirrel, Fox

Amount of matter and energy .............. from the lowest level to the highest level.

Carbon dioxide is released into the atmosphere through ............. .

Plants convert carbon dioxide into .......... by the process of photosynthesis.

Find the odd man out: Photosynthesis, combustion, decomposition, corrosion.

............is an important component of proteins and nucleic acids.

Fungi and other microbes are called..........

Tiger is a /an.......... .

............ is the most important source of energy in any ecosystem.

Find the odd man out: Burning of fossil fuels, forest fire, respiration, volcanic activity.

..........is a primary consumer.

Ecological Pyramid is called............

.......... is a secondary consumer.

Microbes which do not need oxygen are called...........

Find the odd man out: Grasshopper, squirrel, elephant, lion

An intricate network of food chains is called...............

............. cycle is a gaseous cycle

Conversion of ammonia into a nitrite and then nitrate is called..........

............. is a sedimentary cycle.