Doubt Clearance Thread: UPSC 2021

upsc2020

"When in doubt, observe and ask questions. When certain, observe at length and ask many more questions."

Created this thread as a one stop solution for all members so that all the doubts wherein any conceptual clarification is required can be solved here.

jack_Sparrow,curious_kidand122 otherslike this

4.2k comments

Shambhavi_singh .

commented 3 year(s) ago

DMsaid
@Shambhavi_singh The balance of payments (BOP) of a country is the record of all economic transactions between the residents of a country and the rest of the world in a particular period (over a quarter of a year or more commonly over a year).

exactly! but the option says all import and export transactions.. this looks thoda specific isliye i thought how could (a) be correct ..

user_81148

commented 3 year(s) ago

Deleted

Does a virus only need a biological vector ?

This is a 2013 PYQ ..

Shambhavi_singh .

commented 3 year(s) ago

AyeRamadhir .

commented 3 year(s) ago

Shambhavi_singhsaid

Answer is A.

Statement 2 is wrong - Virus is dependent of the host (plant or animal) cell for metabolic functions. When we talk of synthetic mediums, the trait of 'metabolic functions' does not occur because well, they are synthetic mediums, and not plant cells or animals cells - where metabolic functions can occur.

Statement 3 is wrong - Virus has two modes of transmission - biological and mechanical. In biological transmission, the virus replicates into more. In mechanical transmission, the virus does not replicate into more.

Hope this helps!

Edit- Even if you don't know jack about Viruses, this question can be solved using the extreme statements method. :P

Archand,

Shambhavi_singh .

commented 3 year(s) ago

AyeRamadhirsaid
Shambhavi_singhsaid

Answer is A.

Statement 2 is wrong - Virus is dependent of the host (plant or animal) cell for metabolic functions. When we talk of synthetic mediums, the trait of 'metabolic functions' does not occur because well, they are synthetic mediums, and not plant cells or animals cells - where metabolic functions can occur.

Statement 3 is wrong - Virus has two modes of transmission - biological and mechanical. In biological transmission, the virus replicates into more. In mechanical transmission, the virus does not replicate into more.

Hope this helps!

Edit- Even if you don't know jack about Viruses, this question can be solved using the extreme statements method. :P

Thanks alot!

actually i thought the third statement to be correct because we all know that viruses need a host to replicate and survive so I thought maybe only biological vectors are required for transmission ..

AyeRamadhir,

jassikamboj16303 .

commented 3 year(s) ago

@AyeRamadhir Also an addition, a simple observation based. Since viruses can travel through air, or clothes, furniture etc (COVID related instructions) , it shows there isnt a need for biological vector. It can spread through non biological (air, wood etc) also. But, Malaria for eg, doesnt travel through air, person must be bitten by the anopheles mosquito to get infected. So, malaria can be spread by biological vector only. I hope i am right in this logic

Shambhavi_singh,Archandand2 otherslike this

AyeRamadhir .

commented 3 year(s) ago

Arrange the following hills from North to South -

1) Nagari
2) Shirumalai
3) Palkonda
4) Shevroy

Answer -

A) 2 - 3 - 1 - 4
B) 2 - 1 - 4 - 3
C) 3 - 4 - 1 - 2
D) 3 - 1 - 4 - 2

Purplesunbird .

commented 3 year(s) ago

AyeRamadhirsaid
Arrange the following hills from North to South -

1) Nagari
2) Shirumalai
3) Palkonda
4) Shevroy

Answer -

A) 2 - 3 - 1 - 4
B) 2 - 1 - 4 - 3
C) 3 - 4 - 1 - 2
D) 3 - 1 - 4 - 2

ArchAngel96 .

commented 3 year(s) ago

Does UPSC provides for BOLD marking when question is asking forINCORRECTstatement ?

HeNeArKr .

commented 3 year(s) ago

ArchAngel96said
Does UPSC provides for BOLD marking when question is asking forINCORRECTstatement ?

Italics and a little darker than normal font

ArchAngel96,

AyeRamadhir .

commented 3 year(s) ago

Purplesunbirdsaid
AyeRamadhirsaid
Arrange the following hills from North to South -

1) Nagari
2) Shirumalai
3) Palkonda
4) Shevroy

Answer -

A) 2 - 3 - 1 - 4
B) 2 - 1 - 4 - 3
C) 3 - 4 - 1 - 2
D) 3 - 1 - 4 - 2
D?