Homework Help: science

Posted by dominique on Tuesday, October 6, 2009 at 12:06pm.

please could someone help me with these question please i have loked on websites but i am still stuck.

true or false and i need to write a comment why:-

plants photosynthesise 24 hours a day

respiration uses up carbon dioxide

thanks guys!

science - drwls, Tuesday, October 6, 2009 at 12:13pm
false (photosynthesis requires light)

true (carbon dioxide is consumed and oxygen is produced)
science - DrBob222, Tuesday, October 6, 2009 at 12:15pm
First link I tried: photosynthesis does not occur at night.
http://www.newton.dep.anl.gov/askasci/bot00/bot00191.htm

If you are talking about respiration of humans, we exhale CO2 so we aren't using it up. Plants use CO2.

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