45,

46.

47,

48,

With reference to the cause of ozone layer depletion which of the following statement is

incorrect 7

(ಹ) A number of naturally occurring substances like Hydrogen Oxide (HOx), Methane
(CH,), Hydrogen Gas (H,), Nitrogen Oxides (NOx) causes ozone layer depletion.

(8) Chlorine Monoxide (CIO); during volcanic eruptions, significant amount of chlorine
may be released in the stratosphere which causes ozone layer depletion.

(ಲ) Tiny particulate matter in the stratosphere, known as stratospheric aerosols, the only
matter protect ozone layer depletion.

(D) Any event, which release chlorine atoms into the atmospheric, can cause severe ozone
destruction, because chlorine atoms in the stratosphere can destroy ozone very
efficiently.

With reference to an initiative called “The Economics of Ecosystems and Biodiversity (TEEB)’

which of the following statements is/are correct ?

(i) Itis an initiative hosted by UNEP/IMF and World Economic Forum,

(0) Itis a global initiative that focuses on drawing attention to the economic benefits വ്‌
biodiversity.

(1) It presents an approach that can help decision makers recognize, demonstrate and
capture the value of ecosystem and biodiversity.

Select the correct answer :

(+) () and (i) only ® (क) णण

€ को गन (षे णु (2) 0.6) ೫೩ (1)

Biomass gasification is considered to be one of the sustainable solutions to the power crisis in

India. In this context, which of the following statements is/are correct ?

(i) Coconut shells, groundnut shells and rice husk can be used in biomass gasification.

8൫ The combustible gases generated from biomass gasification consist of hydrogen and
carbon dioxide only.

(1) The combustible gases generated from biomass gasification can be used for direct heat
generation but not in internal combustion engines.

Which of the statements given above is/are correct 7

‎@only 0 (i) and (i) only‏ (ه)

‎© () and (i) only (2) 0.) ೫ (1)

‎Asgertion (A) : Biosphere constitutes an excellent life-support system which is sustainable
and can fulfil all human needs.

‎Reason (R): The size and productivity of the biosphere is limited by availability of water,
nutrients and environmental conditions.

‎Identify the correct code :

‎(^) Both (A) and (R) are true and (R) is the correct explanation of (A).

‎(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

‎(C) (A) is true, but (R) is false.

‎(D) (A) is false, but (R) is true.

‎11 016/2020 - T
{P.T.O}