Science & Mathematics - 15 November 2006

I am 11th student.I have a doubt about the experiment which show osmosis in plants. I read that mouth of an inverted thistle funnel is covered with a semi permiable membrane and the funnel is then filled with concentrated solution and dipped in a beaker containing pure solvent. As by the principle osmosis the pure solvent will enter into the funnel through semi permiable membrane and the level of solution inside funnel rises up.This what the experiment shows but I doubts that IT IS DUE TO THE ATMOSPHERIC PRESSURE acting on the surface of pure solvent, b'coz when we dip a straw in water the level of water rises inside the straw. By the same way why should the same thing to be happend here??

please reply me immediatly to get rid of this doubt

2006-11-15 03:31:10 · 1 answers · asked by anu 1 in Chemistry

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Combinations?

I've tried working this one out... and after two whole days have resorted to asking ANYONE to please please help me!

A committee of 3 is to be selected from 4 women and 5 men. The rules state that there must be at least one man and one woman on the committee.

a. In how many ways can the committee now be chosen?

b. Subsequently one of the men and one of the women marry each other. The rules also state that a married couple may not both serve on the committee. In how many ways can the committee now be chosen. (answer in the back of the book is 63)

Erm... could you also explain why you've done what you've done in the working because I just don't get combinations (the teacher wasn't in this week and set it as homework)

2006-11-15 03:30:52 · 6 answers · asked by sherrynkb 3 in Mathematics

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whats the connections between oceanography, meteorology, and geology?

2006-11-15 03:29:32 · 2 answers · asked by jinx 2 in Earth Sciences & Geology

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What affect does the earth magnetic field have on the direction we sleep?

Im interested to see if anyone has any comments to make on this? Does it have any affect on our sleep patterns or any other factors?

2006-11-15 03:28:33 · 7 answers · asked by lil nee 1 in Earth Sciences & Geology

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how can i develope RSA encryption algoritm?

c++ code and speed of RSA or security problem

2006-11-15 03:28:24 · 1 answers · asked by shosho 1 in Mathematics

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Why are the young in the USA so ignorant about world history & geography?

2006-11-15 03:25:23 · 15 answers · asked by Anonymous in Geography

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What exactly does it mean that we only use 5-10% of our brain?

Is it in the physical sense? What does the remaining 90% do? Do scientists and physicians literally look at 90% of the remaining brain and say, "I don't know what that does"? Is it impossible for us to use the remainder? Is it possible to gauge when someone might be using the remainder?

2006-11-15 03:23:19 · 9 answers · asked by replicant21 3 in Biology

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if you travel south from South America what continent would you be at?

2006-11-15 03:22:46 · 5 answers · asked by Anonymous in Geography

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Describe the pyhagorean lifestyle?

2006-11-15 03:21:26 · 2 answers · asked by justin a 1 in Mathematics

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who invented forensic science?

2006-11-15 03:20:28 · 6 answers · asked by JEFF D 2 in Biology

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Explian the Pythagorean philosophy?

number, kosmos, harmonaia

2006-11-15 03:19:52 · 1 answers · asked by justin a 1 in Mathematics

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linkage map Genetics?

A three point testcross was made in corn. The alleles C and c result in colored versus colorless seeds, Wx and wx in nonwaxy versus waxy seeds, and Sh and sh in plump versus shrunken seeds. When plants grown from seeds heterozygous for each of these pairs of alleles were testcrossed, the progeny were as follows.

colorless, nonwaxy, shrunken 84
colorless, nonwaxy, plump 974
colorless, waxy, shrunken 20
colorless, waxy, plump 2349
colored, waxy, shrunken 951
colored, waxy, plump 99
colored, nonwaxy, shrunken 2216
colored, nonwaxy, plump 15

Determine: a) the genotype of the heterozygous parent, b) the order of the three genes, c) the genetic distance between each gene and d) calculate interference.

2006-11-15 03:18:07 · 1 answers · asked by Ashi 2 in Biology

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I need to make a homemade DNA model but is to be able to separate to show DNA replication.?

(double helix with A.G.T.C Ladder in the middle) we cant use model kits, it has to be home made. Any ideas?

size= biggest it can be is able to fit on top of a table.

2006-11-15 03:17:13 · 1 answers · asked by GL 2 in Biology

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Why can we still see the moon when the sun is up the same amount we see at night?

2006-11-15 03:15:28 · 5 answers · asked by gordon p 1 in Astronomy & Space

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What's the difference between the following animals?

Donkey
Mule
Burro
JackAss

How are they created, how was the first one created?

2006-11-15 03:11:58 · 4 answers · asked by Anonymous in Zoology

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Genetics linkage??

The recessive alleles al and dp of two genes on chromosome 2 in Drosophila determine the presence of antenna and wing shape, respectively. If the genes are 13 map units apart, PREDICT the expected genotypes, phenotypes and their relative frequencies among the progeny from testcrossing al dp/ + + heterozygous females to al dp/ al dp males?

2006-11-15 03:11:56 · 1 answers · asked by Ashi 2 in Biology

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