How much of the total quantity of global carbon is dissolved in the oceans?
a. 50%
b. 62%
c. 71%
d. 84%

Which of the following reservoir regulates the amount of carbon dioxide in the atmosphere?
a. Ocean
b. Earth’s crust
c. Land
d. Fossil

Approximately how much of carbon is fixed in the biosphere through photosynthesis annually.
a. 4 × 1013 kg
b. 5.4 x 1015 kg
c. 6.4 x 1011 kg
d. 13 x 104 kg

Which of the following contribute to the atmospheric CO2?
a. Producers
b. Herbivores
c. Saprotrophs
d. All of the above

How could human activities affect the carbon cycle?
a. By Rapid forestation
b. By Massive burning of fossil fuel for energy and transport
c. By Forest fire
d. More than one options are correct.

Where could we find phosphorous in human body?
a. Biological membranes, nucleic acids, shells and carbohydrates
b. Biological membranes, nucleic acids, shells, bones, teeth and cellular energy transfer systems.
c. Shells, bones, teeth, hair, nails and cellular energy transfer systems.
d. None of the above

Which is the natural reservoir of Phosphorous?
a. Ocean
b. Fossils
c. Rock
d. Soil

How do herbivores and other animals obtain Phosphorous?
a. From soil in the dissolved form
b. From plants
c. From drinking water
d. Synthesized in the body.

The waste products and the dead organisms are decomposed by ____________releasing phosphorus.
a. parasitic bacteria
b. phosphate-solubilising bacteria
c. phosphate-solubilising fungi
d. Acidic soil.

Match the following:
                  Column I                                                                                          Column II
(i). no respiratory release of element into atmosphere                                        1. Carbon cycle

(ii). atmospheric inputs of element through rainfall are much smaller.                  2. Phosphorous cycle

(iii). Gaseous exchanges of element between organism and environment are

negligible.

(iv). Human activities have significantly influenced the cycle

(v). According to one estimate 4 × 1013 kg of element is fixed in the biosphere

through photosynthesis annually.

a. 1- i and v; 2- ii, iii and iv
b. 1- iv and v; 2- i, ii and iii
c. 1- iv and iii; 2- i, ii and v
d. 1- i and ii, iii; 2- iv and iv