Official: SFG / RLG All Tests Discussions in one place
Hello All,
The Group usage here is a little cumbersome, so I am creating this thread to make sure that all questions with doubts stay in one place. Can someone push all the doubts and queries here? I will make this an announcement?
-Faceless, Anonymous "root"
Test 30, Ques 36, Statement 1: It refers to the physical position and functional role of a species within the community.
Instead of 'community', it should be 'ecological system' as a niche includes food habits, habitats, etc.
Hi,
This statement is verbatim from the NCERT. An ecological niche is a physical position and functional role of a species within the community. Also, he focus area of the term "Ecological Niche" is - the physical position and functional role of a species within the community of organisms it is a part of. The mere use of the word "community" in place of "ecosystem" (as is used in the standard definition) does not make the statement 1 incorrect.
T30 q24 transfer of energy is always unidirectional from one trophic level to another .
You are right in saying that in a food chain, energy flows from lower trophic levels to the higher trophic levels.
Thus, in a food chain, there is only one direction of energy flow. However, since a Food Chain is a simplistic model of reality.
In reality, an organism can be a part of multiple food chains. Hence in nature, energy flow is occurring not just along "one"
food chain,but along many different food chains. It is in this context, is the word "unidirectional" is used for explaining
energy flow in afood chain and the phrase "all directions" is used for explaining energy flow in a food web.
In Question 24, Statement 1 is -
"In the food web, energy transfer is possible in all directions whereasin the food chain it is unidirectional."
We need to read the whole statement together to understand that the words "all directions" does notimply " energy flow in a single food chain".
It isnotimplying that energy flow can occur from higher trophic levels to lower trophic levels.
Rather, it is used to imply the existence of energy flow along different food chains a single organism is a part of.
lonecode,SFG batch 2 test 30
Question number 17
Ephernerals are free from any xerophilous adaptations. Also, the species which survive dry season are called rain perennials ajd not Ephernerals.
That is what is written in the explanation. The ephemerals are delicate species without any special (xerophilous) adaptations.Xerophile or xerophilous meansdry-loving or drought-loving organisms,such as plants being characterized by various ecologic adaptations to desert life, such as excessively long roots, fleshy stems (cacti) or thin leaves (acacia). But ephemeralsappear soon after the rains, grow and bloom with flowers and fruits for a very short period. They die out as soon as the soil moisture dries up.
T30 q24 transfer of energy is always unidirectional from one trophic level to another .
Food chain and food webs are theoretical concepts of understanding energy transfers across different organisms,and w.r.t food chain(theoritical definition) it is unidirectional. Whereas a food web may incorporate multiple energy pyramids( both deutrius and grazing) which could have multidirectional energy flow interlinked with each other.
SFG batch 2 test 30
Question number 17
Ephernerals are free from any xerophilous adaptations. Also, the species which survive dry season are called rain perennials ajd not Ephernerals.
Ofcourse you're right, ephernerals are free from xerophilous adaptations even the option/question never says that they've xerophilous adaptations. Moreover it's not necessary that rain perennials survive dry season only, they may survive snow or other unfavourable climatic conditions too and bloom only during favourable rainy season.
T30 q24 transfer of energy is always unidirectional from one trophic level to another .
Food chain and food webs are theoretical concepts of understanding energy transfers across different organisms,and w.r.t food chain(theoritical definition) it is unidirectional. Whereas a food web may incorporate multiple energy pyramids( both deutrius and grazing) which could have multidirectional energy flow interlinked with each other.
Please provide the source for this information
Energy always flows from "Producer to Consumer"(Unidirectional) and thats how Thermodynamics works. The statement has a wrong Technical wording. It can never be "All Directional" which means "Producer to Consumer" and Consumer to Producer".
It is actually the "many pathways" in Food Web not "all directions". So None of the statements are correct in this question.
Your question could have used "all pathways"/ "different food chains" etc. But context of the "Unidirectional" or "All directional" has one and only one meaning which rules out any subjectivity.
Also please Correct the answer of Q:37 in your Answer key and update the list accordingly.
Thanks.
KropotkinSchmopotkin,Regarding Test 30 Q34 Isn't Mosquito sucking human blood example of parasitism?
Read some sources although Can't judge if they are reliable.
https://sites.google.com/a/bps101.net/symbiosis-website--miranda-s/content-page-2
If it is an example of parasitism then it would make the answer D
Piku25,mickeyviru
see this.It incorporates both grazing as well as detritus food chains as its sub-components. Doesn't it seem to be multidirectional?Moreover it was to be referenced w.r.t comparative unidirectional aspects of food chain as a concept.
Sir in this article , no where it is mentioned that foodweb has multidirection energy flow.
Energy (as a concept ) flows in the direction from lower trophic level to higher trophic level ( in both detritus and grazing food chain)
food web is to depict interconnection of different food chainsand not “multidirection” energy flow . Even in food web energy flow from lower to higher trophic level only
lonecode,Test 31, Q 28: how is the declining bee population going to cause soil erosion?
It seems too much of a long driven and indirect consequence to be included here.
And when generally dealing with such type of questions should we take into consideration all types of impacts, no matter how insignificant or indirect they are to the point of concern.
@Thinker Could you please provide a source for the information that Sustainable Sugarcane Initiative requires more nitrogenous fertilizer ?
mickeyviru,Mzp6628
In this quen ans given at various online platform is d.. I have confusion in gypsum statement.. I think this is correct but ans given is c....@Disciple @Thinker
Which of the following practices can help in water conservation in agriculture?
1. Reduced or zero tillage of the land
2. Applying gypsum before irrigating the field
3. Allowing crop residue to remain in the field
Select the correct answer using the code given below.
In this quen ans given at various online platform is d.. I have confusion in gypsum statement.. I think this is correct but ans given is c....@Disciple @Thinker
Which of the following practices can help in water conservation in agriculture? 1. Reduced or zero tillage of the land
2. Applying gypsum before irrigating the field
3. Allowing crop residue to remain in the field
Select the correct answer using the code given below.
Rather than searching previous year questions in various platforms, please follow the official website. This is a 2017 question, for a person preparing UPSC, all the previous year papers should be downloaded or printed. Also the answer provided in the official key is C.
Mosquitoes sucking human blood is an example of parasitism.
How this is wrong. In explanation it talks about female mosquito but here its not clear.
Pls explain@Disciple
mickeyviru,
@mickeyviru pliz read ncert class 12 biology... It is classical case which looks like its parasitism but it is not... Females sucks blood just for their eggs
Ok thanks
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