IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: Blizz_rb93 on May 08, 2010, 09:21:58 am

Title: Biology Unit 3B
Post by: Blizz_rb93 on May 08, 2010, 09:21:58 am

This is a question about Daphnia

- Suggest why Daphnia needs a heart and circulatory system?
the rest of the daphnia questions i know but this one i didnt know lol

Title: Re: Biology Unit 3B
Post by: nid404 on May 08, 2010, 09:30:13 am

Is there anything special about daphnia?

As far as I know organisms require a heart to act as a pump and enable efficient transport of substances like nutrients and respiratory gases for cells.

Also, what i can figure is a heart and circulatory system in required in this case, cause maybe the surface are to volume ratio of daphnia is not high enough to allow exchange of substances on its surface. So, an internal system is required

Maybe I can help more...lemme know

Title: Re: Biology Unit 3B
Post by: Blizz_rb93 on May 08, 2010, 09:45:49 am

Oh okay i see
thank you nid!! :D

Title: Re: Biology Unit 3B
Post by: nid404 on May 08, 2010, 09:47:30 am

No problem...

I'll study the daphnia a lil more in detail...if i get to know anything more..i'll put it up here  :)

Title: Re: Biology Unit 3B
Post by: Assi1993 on May 08, 2010, 03:56:23 pm

daphnia heart rate practical...

Title: Re: Biology Unit 3B
Post by: Blizz_rb93 on May 08, 2010, 06:44:15 pm

Quote from: Assi1993 on May 08, 2010, 03:56:23 pm

daphnia heart rate practical...

thank you!

Title: Re: Biology Unit 3B
Post by: Meticulous on May 08, 2010, 06:48:03 pm

Try this site. Quite helpful I must say, to me at least.

www.practicalbiology.org