Name the main constituent of biogas.

Which one of the following converts sunlight directly into electrical energy?

Choose the correct example of a non-renewable source of energy.

The OTEC plants can operate if the temperature difference between the water at the surface and water at depths up to 2 km is --------

The energy possessed by wind is ------

The fusion reactions take place at -------

Minimum wind speed required for functioning of a windmill is about ------

Solar cells are used in ------

To produce biogas in a biogas plant, ------- is needed.

The residue left behind after burning wood in a limited supply of air is --------

Choose the correct substance which is used for making solar cells.

If 1 atomic mass unit (u) is converted into energy, it will be equal to about -----

In a nuclear reaction, the quantity conserved is --------

In nuclear reactions, energy is released due to -------

The ------- energy in wax is converted to heat energy and light energy on burning.

Flowing water possesses -------- energy.

The region where large number of windmills is erected to produce electricity is called wind energy ------

The energy available due to the difference in the temperature of water at the surface of the ocean and at deeper levels is called ---------

A combination of a large number of solar cells is called a --------

Solar energy consists of -------------- energies.

In steam engines, heat energy of steam is converted into ---------------energy.

---------------------- is the energy of water.

Energy derived from hot spots beneath the earth is called --------- energy.

The spent slurry in a biogas plant is used as -------

Hydropower is a non-renewable source of energy.

Methane is a greenhouse gas

Rice husk is a biomass

Wind energy produces environmental pollution.

The process of burning fuel is called oxidation.

Exploiting any source of energy disturbs the environment in some way or the other.

A fusion process is just the opposite of fission process.

Dams built for hydroelectric plants helps in flood control and irrigation.

Charcoal is better fuel than wood.

Sun is the source of nuclear energy.

Stored water in dams possesses potential energy.

A solar cooker produces smoke due to which air pollution is caused.

What is the average amount of organic matter available at each trophic level?

Identify the herbivore among the following.

Which of the following trophic levels in a ecosystem classify bacteria?

What is a biodegradable waste?

An aquarium is an example of an/an ---------

Ozone absorbs -------

Which of the following is a non-biodegradable waste?

Which of the following causes acid rain?

A food chain comprises frog, insect, bird and grass. Which organism is likely to have maximum concentration of harmful non-biodegradable chemicals in it?

Which of the following affects depletion of ozone layer the most?

Autotrophs capture energy from sunlight and convert it into -------- energy.

The energy form ------ supports all the activities of the living world.

Green plants capture only -------- per cent of sun’s energy that falls on their leaves and convert it into chemical energy.

Flow of energy in a food chain is ---------

--------- is used in hair dyes, refrigerators, perfumes and air conditioners.

------- organisms feed on both plants and animals.

Ozone contains ------- atoms of oxygen.

The energy captured by autotrophs ultimately reverts back to the solar input.

Improvements in our lifestyle have reduced the amount of waste generated by humans.

The various components of an ecosystem are interdependent on each other.

Producers derive energy form sunlight.

Ecosystem consists of living organisms only.

Decomposers help in cleaning the environment.

The length and complexity of food chain vary greatly.

Aquarium is --------

Parasites are ---------

Bio-magnification is --------

Ecosystem is ---------