bio questionxxx

[hassam]

u mean white blood cells are present in the bronchus from b4?

 

[Amna]

why is it difficult to control aids......?

lots of reasons, including the fact that there's really no cure, and no vaccines etc. the prevention methods require change in lifestyle... which requires both education and incentive... which erm aren't very common resources among us humans all over the world. and that's the other thing: it's a world-class issue. it's not something only one country or region can control even if they wanted to. it needs a high level of international co-operation...

how many marks is the question worth?

 

[ahmedrik1501]

1.Well for this question you can write many answer first of all dissolving of Ions in the water is a major point due top polarity.
2.Then explain that water molecule are cohesive due to hydrogens bonds and this help in mass flow
3.also explain the adhesive property in which water stick to xylem vessel and due cohesive property attracts other molecule and help in flow of water.