Advertisement

A renewable exhaustible natural resource is

  • coal

  • petroleum

  • minerals

  • minerals


D.

minerals

Forest is renewable, exhaustible natural resource. Renewable resources are living, able to reproduce or replace themselves and to increase. The renewable resources get replenished, recycled or reproduced and can fast forever provided they are not used beyond their renewability. The exhaustible resource is the natural resources with finite stock or supply, they are vulnerable to both qualitative and quantitative degradation.

Coal and petroleum are non- renewable and exhaustible natural resources.
Minerals are renewable and inexhaustible natural resources.

840 Views

Advertisement

Which one of the following is not used in organic farming?

  • Glomus

  • Earthworm

  • Oscillatoria

  • Oscillatoria


D.

Oscillatoria

Except for snail, all these are used in organic farming - 

Glomus - Endomycorrhiza
Osscillatoria - BGA
Earthworm - Vermicompost

347 Views

The two gases making highest relative contribution to the green house gases are

  • CO2 and CH4

  • CH4 and NO2

  • CFCs and N2O

  • CFCs and N2O


A.

CO2 and CH4

The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth's surface and atmosphere. Clouds and gases reflect about one-fourth of the incoming solar radiation and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it , while a small proportion is reflected back. Earth's surface reemits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (eg CO2, CH4 etc) absorb a major fraction of it. The molecules of these gases radiate heat energy and a major part of which again comes to earth's surface thus heating it up once again CO2 (60%) and CH4 (20%) are commonly known as greenhouse gases because t hey are responsible for the greenhouse effect, that ultimately leads to global warming.

383 Views

dB is a standard abbreviation used for the quantitative expression of 

  • the density of bacteria in a medium

  • a particular pollutant

  • the dominant Bacillus in a culture

  • the dominant Bacillus in a culture


B.

a particular pollutant

Noise pollution is a physical form of pollution that affects the receiver directly. dB (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of 80 dB and above, it harms hearing system. The WHO has fixed 45 dB as the safe noise level for city

537 Views

Which two of the following changes (1-4) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?
1) Increase in red blood cell size
2) Increase in red blood cell production
3) Increase in breathing rate
4) Increase in thrombocytes count
Changes occurring are

  • (2) and (3)

  • (3) and (4)

  • (1) and (4)

  • (1) and (4)


A.

(2) and (3)

When a person moves to higher altitudes, the PO2 and total atmospheric pressure decrease. Hypoxia stimulates the JG - cells of the kidney to release erythropoietin hormone, which stimulates erythropoiesis in bone marrow causing polycythemia. Hypoxia will also increase breathing rate. Initially, the size of RBCs will also increase but with an increase in number of RBCs, the size of RBCs becomes normal.

299 Views

Advertisement