Alluvial soils are rich soil for crop cultivation but are poor in

(1) humus

(2) nitrogen and humus

(3) organic material

(4) inorganic material

Bamboo is classified as

(1) Tree

(2) Grass

(3) Shrub

(4) Herb

The transfer of minerals from topsoil to subsoil through soil-water is called?

(1) Percolation

(2) Conduction

(3) Leaching

(4) Transpiration

Black soil is also known by which of the following name?

(1) Khadar Soil

(2) Bangar Soil

(3) Alluvial Soil

(4) Regur soil

Salination of soil is caused by

(1) pesticides

(2) soil erosion

(3) excess irrigation

(4) crop rotation

Which one of the following is the indirect use of forests?

(1) Medicinal plants

(2) Checking soil erosion

(3) Building material

(4) Grazing

In order to prevent the expansion of deserts, trees are planted in strips or blocks with the shortest trees on the desert side and the tallest on the other side. Such plantation is called?

(1) shelterbelts

(2) agroforests

(3) windbreaks

(4) social forests

The food chain refers to the transfer of energy from :

(1) the interior of the earth to the surface

(2) lower to higher latitudes

(3) one organism to another

(4) organisms of the land to those of the sea by means of river

The presence of a lion in the forest is essential in order to

(1) keep the trees safe from felling

(2) add beauty in the forests

(3) save the pastures from being overgrazed

(4) keep other carnivorous animals away

Which one is not a non-conventional energy source

(1) Nuclear energy

(2) Solar Energy

(3) Wind energy

(4) Tidal power

The Montreal Protocol 1987 refers to

(1) saving the Bio-diversity of our planet

(2) signing of an accord on the peaceful uses of atomic energy

(3) signing of an accord on keeping Antarctica as a nuclear-free zone

(4) saving the ozone layer from destruction by reducing the use of CFCs