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[сᴏᴏʟ сяуѕтᴀʟѕ]

Is this from an IGCSE paper?? I think its pretty irrelevant since the direction of light is not given. If it were given, then the shoot would grow and bend towards the direction of light, since agar is permeable and therefore, auxin can diffuse through it. Btw which paper is this question from??

Assalam-o-alaikum wr wb..
which question you talking about?

 

[salvatore]

Assalam-o-alaikum wr wb...

why is the answer D?

View attachment 12458

I think this is because the mixture of ammonia and nitrogen will not react or dissolve in water and hence, the gas will remain intact. In A, sodium hydroxide will react with carbon dioxide to form sodium carbonate. In B, Sodium hydroxide will react with sulphur dioxide to form sodium sulphate and C, ammonia will dissolve in water. The only exception is the mixture of ammonia and nitrogen, which will neither react nor dissolve in water. Does that make sense?? (I'm not sure though..)

 

[salvatore]

Assalam-o-alaikum wr wb..
which question you talking about?

Alaikum salam, someone had asked this question..

 

[Abu mota]

Alaikum salam, someone had asked this question..

It is A because it says tip is removed so the plant won't grow at all

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

I think this is because the mixture of ammonia and nitrogen will not react or dissolve in water and hence, the gas will remain intact. In A, sodium hydroxide will react with carbon dioxide to form sodium carbonate. In B, Sodium hydroxide will react with sulphur dioxide to form sodium sulphate and C, ammonia will dissolve in water. The only exception is the mixture of ammonia and nitrogen, which will neither react nor dissolve in water. Does that make sense?? (I'm not sure though..)

ohh....Jazakallah Khair

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Alaikum salam, someone had asked this question..

Walaikumassalam wr wb..
ohh..you quoted the wrong post that time so i was wondering

 

[Maz]

It is A because it says tip is removed so the plant won't grow at all

The plant does not grow due to its tip. It only shows directional growth due to it's tip.

 

[salvatore]

It is A because it says tip is removed so the plant won't grow at all

I have it in my text book that, if the tip (coleoptile) of a shoot is cut off and replaced by agar jelly with auxin, the shoot will grow towards the direction of light! How about that??

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

can someone answer this question please.

It is A because it says tip is removed so the plant won't grow at all

I think the answer is C
cuz it says the agar thingy has auxins in it so the plant WILL grow...
and the auxin should be at the side, where the length is more than the other...
so...is the answer C?

 

[Maz]

I think the answer is C
cuz it says the agar thingy has auxins in it so the plant WILL grow...
and the auxin should be at the side, where the length is more than the other...
so...is the answer C?

I think it's B, since auxins inhibit growth in the shoot, so the side with the agar will grow slowly and the plant will grow towards the right side.

 

[salvatore]

I think the answer is C
cuz it says the agar thingy has auxins in it so the plant WILL grow...
and the auxin should be at the side, where the length is more than the other...
so...is the answer C?

Hey, hmm that makes perfect sense! I didn't think of that earlier.. ur right, i guess!

 

[Maz]

Hey, hmm that makes perfect sense! I didn't think of that earlier.. ur right, i guess!

Why C?

 

[Abu mota]

ok i didnt read it carefully, but im very sure that it is D because tip is responsible for detecting the light and responding to the light and so without the tip the plant willnot know where is the light and so it will just grow upwards and so it is D and im very very sure
EDIT: which paper is this and cud u post a link of the ms? ty

 

[Maz]

ok i didnt read it carefully, but im very sure that it is D because tip is responsible for detecting the light and responding to the light and so without the tip the plant willnot know where is the light and so i will just grow upwards and so it is D and im very very sure

You are forgetting the block of jar containing auxin.

 

[Abu mota]

You are forgetting the block of jar containing auxin.

the auxin doesnt detect the light, only the tip does, auxin is just resposible for growth :/ as far as i know im not pretty sure though

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Why C?

ok i didnt read it carefully, but im very sure that it is D because tip is responsible for detecting the light and responding to the light and so without the tip the plant willnot know where is the light and so it will just grow upwards and so it is D and im very very sure
EDIT: which paper is this and cud u post a link of the ms? ty

i checked it...the answer IS C!

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

the auxin doesnt detect the light, only the tip does, auxin is just resposible for growth :/ as far as i know im not pretty sure though

the question isn't related to light! it's related to auxin!

 

[Abu mota]

the question isn't related to light! it's related to auxin![/quote

i checked it...the answer IS C!

the old MS sometimes are wrong :/

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

I think it's B, since auxins inhibit growth in the shoot, so the side with the agar will grow slowly and the plant will grow towards the right side.

nope...it doesn't! auxins causes the plants to bend...and where they are present, that side bends MORE than the other...so the answer IS C!

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

they are but SOMETIMES!
this time i am pretty sure the answer is correct....check your book/guide...you will know