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

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

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

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

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

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

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

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

Oxygen is released in the process of

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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