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Physics, Chemistry and Biology: Post your doubts here!

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I'll let you know if I want em. But for now i'll be solving these PastPapers so i may require help with em :3
Alright.
You can post your doubts in the A level Forum.I'll try to help where I can,other wise the other members will surely help out.
Best of Luck!
 
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IGCSE 2016 STUDENTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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View attachment 58847

can someone pls explain why the ans is C... TIA :)

The balls P and Q didnt attract each other which means they had the same charges. As P is Negative thus Q will also be negative. As for R it is attracted to ball Q. Ball Q being negative will only attract positive or a neutral ball. As the choices don't state any choice about it being neutral, positive will be the choice.
 
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The balls P and Q didnt attract each other which means they had the same charges. As P is Negative thus Q will also be negative. As for R it is attracted to ball Q. Ball Q being negative will only attract positive or a neutral ball. As the choices don't state any choice about it being neutral, positive will be the choice.

thank you!
 
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Can someone please help me with the topic of inheritance
biology.
How to ace this topic??
1:Using the F1 plants from the last question, self pollinate these pea plants (i.e. use the alleles of the F1 as the parents). Set out the cross and state the ratio of tall to dwarf plants.
 
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Can someone please help me with the topic of inheritance
biology.
How to ace this topic??
1:Using the F1 plants from the last question, self pollinate these pea plants (i.e. use the alleles of the F1 as the parents). Set out the cross and state the ratio of tall to dwarf plants.
Umm... can you post the whole the question plz ?
 
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