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Biology; Chemistry; Physics: Post your doubts here!

Spidey21

Spidey21

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Fallen316 said:
Q) explain difference between an allele and a gene ?
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a gene is the unit for inheritance and allele is the different forms of genes for example...Hair is a gene
and Brown hair, black hair blonde hair, etc are alleles..:D

EDIT : Hair Colour is the gene not Hair....LOL
 
Amber

Amber

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ashiqbal said:
Ok v.v important:
i need three to four points of why mother's blood is not continuous with the fetal blood? 2 points i know are:
  1. the difference in pressure
  2. difference in blood group(all that co-aglutination and stuff

so tow or at least one more point!
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some substances in the mothers blood can kill the fetus or are harmful to the fetus (CO, nicotine)
 
Dukeofwin

Dukeofwin

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ashiqbal said:
Ok v.v important:
i need three to four points of why mother's blood is not continuous with the fetal blood? 2 points i know are:
  1. the difference in pressure
  2. difference in blood group(all that co-aglutination and stuff

so tow or at least one more point!
Click to expand...
This question can hardly be of 4 marks, thus two reasons with explanation are enough! The 2 reasons you know are the only included in book. So you are good to go
 
daredevil

daredevil

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ashiqbal said:
Ok v.v important:
i need three to four points of why mother's blood is not continuous with the fetal blood? 2 points i know are:
  1. the difference in pressure
  2. difference in blood group(all that co-aglutination and stuff

so tow or at least one more point!
Click to expand...
- the mother's blood may be carrying some disease which can be transferred to the fetus whose immune system is not yet fully built up.
 
malay

malay

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Spidey21 said:
(a)J: epidermal cells
K: Spongy Mesophyll cells
Click to expand...
J is cuticle
sarcastic_smile.gif
..see carefully!
 
daredevil

daredevil

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Talhakhan said:
Sorry its actually part c....
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c) i) 03 00 : N (because it will be night time [3 a.m.] and the stomal pore will be close.
ii) 19 30 : O (because that will be like early in the morning[7 a.m.] so the sun is not at its full height so stomata will not be fully open but it will be open a little bit.

get it?
 
Talhakhan

Talhakhan

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daredevil said:
c) i) 03 00 : N (because it will be night time [3 a.m.] and the stomal pore will be close.
ii) 19 30 : O (because that will be like early in the morning[7 a.m.] so the sun is not at its full height so stomata will not be fully open but it will be open a little bit.

get it?
Click to expand...
Thanks alot for the help....
 
Spidey21

Spidey21

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Talhakhan said:
Why it would be N PLZZZZ need help with this why.... Shouldn't it be M ...
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nope it CANT be M
look at 03:00
there is no light and no need for gasoues or any exchange so it will be almost close

and at 19 30 there will be little or no photosynthesis so almost the same but a little bigger
 
Talhakhan

Talhakhan

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daredevil said:
.ii) 19 30 : O (because that will be like early in the morning[7 a.m.] so the sun is not at its full height so stomata will not be fully open but it will be open a little bit.
?
Click to expand...
If you don't mind its 19 30 (7 p.m) right ..... Thanks for the help anyway....
 
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