A level Biology: Post your doubts here!

[innovative_1]

How is 1 correct?

View attachment 63977

It is right osmosis occurs in phloem the mass flow u already know

 

[innovative_1]

Im

How is 1 correct?

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I'm not sure abt diffusion in xylem

 

[A*****]

It is right osmosis occurs in phloem the mass flow u already know

But mass flow is different form diffusion...no?

 

[A*****]

Pressure in atrium can never rise above ventricle!

In this yellow part, isn't it higher? How will the valve open then??

 

[Tom Sewage]

need help
can someone explain why the answer to this question is D

 

[Hisham Khan]

aw

I'm feeling so alone over here now

awww

 

[Hisham Khan]

View attachment 63983
need help
can someone explain why the answer to this question is D

O can be given to anyone so It leaves us B and D.
It is D as blood group Ab diesent contain antibodies for either A or B

 

[Hisham Khan]

In this yellow part, isn't it higher? How will the valve open then??
View attachment 63980

Learn EGF

 

[Hisham Khan]

But mass flow is different form diffusion...no?

Diffusion isin't mass flow. Mass flow is the movement of dissolved nutrients into a plant as the plant absorbs water for transpiration. ... Diffusion is the movement of nutrients to the root surface in response to a concentration gradient.

 

[Hisham Khan]

yea I do, the guess paper. I'll post as soon as I find the qp XD

All thanks to you,if you hadn't replied to my post,I might never have even replied to this post..

 

[A*****]

Diffusion isin't mass flow. Mass flow is the movement of dissolved nutrients into a plant as the plant absorbs water for transpiration. ... Diffusion is the movement of nutrients to the root surface in response to a concentration gradient.

Yeah so how is diffusion involved in xylem and phloem??

 

[A*****]

Learn EGF

U tell me that in this part the pressure of atria is higher than that of ventricles so that the valve opens...is this correct? Then how is the statement in C in this question wrong?

 

[A*****]

Answer to this plz

 

[Hisham Khan]

View attachment 63992 View attachment 63992 Answer to this plz

C fir 35

 

[Hisham Khan]

U tell me that in this part the pressure of atria is higher than that of ventricles so that the valve opens...is this correct? Then how is the statement in C in this question wrong?View attachment 63991

Not sure but during ventricular diastole occurs even after the ventricular muscle contract to push blood up,so pressure in atria aren't higher then in ventricle I guess

 

[Hisham Khan]

Goodlunch xD

 

[SohaibButt]

Goooooddddd lucccck everyone!!!!!

 

[SohaibButt]

How was ur paper????

 

[SohaibButt]

It was anaphase n telophase or methaphase n anaphase??

 

[SohaibButt]

What happens in cytokineses like sharing of substance or nuclear envelop forms??