Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

View attachment 42426 View attachment 42427

can anybody explain these questions fully

after a few minutes the weight of the leg increases ... this is because the leg muscles are at rest and are doing no work so the blood coming from the arteries does not flows back at the same rate through the veins (which push the blood at lower pressure-upwards) ... and i think this excessive bllood in the muscles causes his weight in the lower part to increase and the chair moves down ...

 

[kirann]

the blood is pushed in spurts in the arteries of the leg muscles ( in pulses) hence this creates pressure on the rested muscles causing them to contract so the foot moves every time a pulse is created ..and hence counting the number of times the foot moves in 60 seconds the pulse rate can be found.....

so whenever pressure is created on the muscles they contract?

 

[kirann]

after a few minutes the weight of the leg increases ... this is because the leg muscles are at rest and are doing no work so the blood coming from the arteries does not flows back at the same rate through the veins (which push the blood at lower pressure-upwards) ... and i think this excessive bllood in the muscles causes his weight in the lower part to increase and the chair moves down ...

im really worried for sec B & C
but blood in veins already have lower pressure right ?

 

[Abdul Hanan]

guys can anyone tell me about the following:
-renal vein
-renal artery
-hepatic vein
-hepatic artery
-hepatic portal vein
thanx!!

 

[kirann]

guys can anyone tell me about the following:
-renal vein
-renal artery
-hepatic vein
-hepatic artery
-hepatic portal vein
thanx!!

i can try,
The renal vein are veins that drain the kidney. They connect the kidney to the inferior vena cava. They carry the blood purified by the kidney, carries de-oxygenated blood
renal artery is an artery originating from the abdominal aorta and supplying the kidneys with unpurified blood.carries oxygenated blood
The hepatic artery is a blood vessel that carries blood to the liver.
the hepatic vein carries deoxygenated blood away from liver.
hepatic portal vein connects small intestine to the liver which transports sugars and amino acids to liver for further process.

 

[kirann]

guys is there any trick or mnemonic to remember all antagonistic movements?

 

[Lilly2318]

Help wid Q 37 nd 38 . Both answers are C

 

[Lilly2318]

Help wid Q 37 nd 38 . Both answers are CView attachment 42446

i hv anothe Q . in epremints of plants. the apprsatus is coverd bya black cloth or covering smtimes. WHAT'S THE PURPOSE?

 

[***amd***]

Help wid Q 37 nd 38 . Both answers are CView attachment 42446

dunno about Q37, but Q38...
see, we just make all possible genotypes and their phenotypes.

genotype...............................................phenotype
...EF..........................................................EF........
...EG...........................................................E.........
...EE............................................................E........
...FF............................................................F.........
...FG...........................................................F.........
...GG...........................................................G.......

possible genotypes = 6
possible phenotypes = 4

 

[Lilly2318]

i hv anothe Q . in epremints of plants. the apprsatus is coverd bya black cloth or covering smtimes. WHAT'S THE PURPOSE?

And also waht is the purpose of roller pump nd bubble trap in dylasis machine?

 

[***amd***]

i hv anothe Q . in epremints of plants. the apprsatus is coverd bya black cloth or covering smtimes. WHAT'S THE PURPOSE?

to stop light from being available to plant, to make light a limiting factor.

 

[***amd***]

And also waht is the purpose of roller pump nd bubble trap in dylasis machine?

roller pump? the only pump i know is used to maintain the blood pressure.
bubble trap = (not sure) is used to avoid bubbling in blood to prevent it from clotting.

 

[***amd***]

what is the difference between:

1. allele and gene?
2. gene mutation and chromosomal mutation?

 

[Lilly2318]

Gene is a segemnt of DNA . Allele is forms of a gene
gene mutation is the change in structure of gene ( sponateously ) chromosal: the change in number of normal chromosomes e.g Down's syndrome

 

[***amd***]

Gene is a segemnt of DNA . Allele is forms of a gene
gene mutation is the change in structure of gene ( sponateously ) chromosal: the change in number of normal chromosomes e.g Down's syndrome

any example for gene mutation?

 

[Lilly2318]

any example for gene mutation?

sickle cell aneamia

 

[Lilly2318]

any example for gene mutation?

Hows prep going?

 

[Lilly2318]

PROBLEM HERE I THOUGHT ANSWER WAS D BUT ITS C. WHAT DO U PPL THINK. AM I CONFUSED IN STRUCTURES.

 

[***amd***]

Hows prep going?

just started. wbu?

PROBLEM HERE I THOUGHT ANSWER WAS D BUT ITS C. WHAT DO U PPL THINK. AM I CONFUSED IN STRUCTURES.

Xylem vessel is always towards the upper side of vascular bundle (towards cuticle)
phloem is downwards. so Q is xylem, R is phloem

 

[Abdul Hanan]

PROBLEM HERE I THOUGHT ANSWER WAS D BUT ITS C. WHAT DO U PPL THINK. AM I CONFUSED IN STRUCTURES.

correct answer is C, note that Q are hollow tubes so they are xylem..(conduct water)
the sieve plates make the phloem appear to have the tiny holes...(phloem conducts the sugars)