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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Oxygen is released in the process of

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

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

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

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

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

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

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

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

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

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

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

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