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Zoology

Blazing goIITian

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19 Mar 2009 20:50:44 IST

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zoology quesn thread

None

hi guyz.. maybe u have seen the enormous sucess of the inorganic thread...so, i'm starting this here....

all we have to do is keep on posting new quesns after giving answers to previous ones.....even if the answer is known to u..

let me start wid the quesn...

bacteria also produce ATP like eukarya..

and it also uses proton gradient for converting ADP to ATP ...

mitochondria pumps it into the perimitochondrial space...

my quesn is.. where does the bacteria pump the H+ ions from its matrix....

options will be given 2morow if no one is able to answer....

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Bhaskaryya Baruah

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9 Apr 2009 23:20:48 IST

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Confused between auxin and gibberelin , but i wud like to go with (b) gibberelin

anakonda

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9 Apr 2009 23:26:11 IST

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gibberelin...

JPS

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10 Apr 2009 01:16:42 IST

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yes the answer is gibberellins.

tejas

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10 Apr 2009 10:46:37 IST

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gibberallins....for sure......!!!

tejas

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10 Apr 2009 10:55:19 IST

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no....it cant actually b gibberalins dude and gals........gibberalins promotes blottin naa????it has to b ABA i guess....it acts opposite to tht of gibberallin actions.......vigg...man this is confusin...POST THE ANSWER OR NUDGE

vignesh the cooler version of newton

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10 Apr 2009 11:01:14 IST

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tejas was the one who got closest.

answer is ethylene !!!!!!

why?? okay.. in aquatic plants, ethylene is not able to diffuse out of the plant.. so, its concentration inside the plant increases...

now, ethylene inhibits absicssic acid synthesis ...

and absissic acid is the major anti-gibberelin in the plant..

now.. ABA is inhibited.. so, gibberelin can act more freely....

so, answer is ethylene. it is due to increase in conc. of ethylene and not gibberelin which helps in this.....

i'm really surprised NCERT said this.. it only said ethylene helps in internodal elongation in deep water rice plants... i also wondered why..

Sahithya

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10 Apr 2009 11:06:51 IST

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plumose stigma is an adaptation forhydrophilyornithophilyzoophilyanemophily

vignesh the cooler version of newton

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10 Apr 2009 11:15:03 IST

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plumose stigma is a character of graminae family.. so, it must be helping in anemophily ( wind pollination)

Sahithya

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10 Apr 2009 18:48:06 IST

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1Contraction of gall bladder is due to a) Gastrin b) Secretin c) Cholycystokinin d) Enterogasterone2 Chromosome theory of inheritance was proposed bya) Walter Sutton and Theodor Boveri b) Flemming and Strasburgor c) Hofmeister and Waldeyer d) T. H. Morgan

JPS

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10 Apr 2009 20:32:46 IST

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contraction of gall bladder- cholecystokinin........chromosome theory- Sutton n Boveri

Sahithya

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10 Apr 2009 21:04:34 IST

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rill n gully erosion are caused by wind water both 1 n 2

Sahithya

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11 Apr 2009 08:19:26 IST

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If the size of a fertilized egg of frog is compared with the size of its blastula and gastrula stages, which of the following observations will be correct ? 1. There is a progressive increase in size from zygote to blastula to gastrula 2. All the three will be of the same size 3. Zygote will be smaller, while blastula and gastrula will be larger 4. Gastrula will be larger, while zygote and blastula will be of same size

Sahithya

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11 Apr 2009 08:20:50 IST

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in the above question leaving options wat is the correct conclusion

vignesh the cooler version of newton

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11 Apr 2009 09:44:20 IST

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hey.. frog blastula develops blastocoel .. so, answer is option 1.. there is progressive increase in the size of egg to blastula to gastrula.. had they asked of morula, then, size of egg and morula is same..... becoz during cleavage divisions, there is no increase in size of the whole thing.. plzz correct me if wrong..

Sahithya

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13 Apr 2009 20:29:54 IST

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hey given ans is 4

Anurag Seth

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15 Apr 2009 08:28:25 IST

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2) gibberelin ??

vignesh the cooler version of newton

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17 Apr 2009 23:56:43 IST

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hey anurag, answer is ethylene.. plzz read the reason once and point out any mistake u find...

i have another quesn for the super students of goiit....

which organism did engelman while finding out the absorbtion spectrum in plants ???

that was js for fun(hehe).. here's a better one...

Darwin's theory says unit of natural selection is individual, i.e natural selection operates at individual level...

then, how is that we see altruism in many organisms like bees, ants etc...because altruism doesnt favour the selection of the individual exhibiting altruism.....

vignesh the cooler version of newton

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19 Apr 2009 16:24:30 IST

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is anyone attempting it???

tejas

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20 Apr 2009 22:22:48 IST

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i m not sure but i guess it has somthin to do with the adaptations and habitat....considering tht most species of ants and bees hav a common descent and tht they can live only in certain areas tht hav favorable features or a bit adverse conditions wer dey show altruism and tend to stay in these adverse condition.......plzz nudge if somthin is wrng.....

vignesh the cooler version of newton

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20 Apr 2009 22:53:31 IST

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plzz read about kin selection.. this theory will confuse us very much.. according to this, the features like altruism are explained on the basis that though the individuals act selflessly, the alleles are acting selfishly only... the bees and ants show altruism to protect their kins as they share the similar alleles..

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