Qualification > Sciences
bio ppr1 question
unknown 101:
--- Quote from: Sue T on May 25, 2010, 07:12:15 pm ---Which is characteristic of phloem sieve tubes?
solute potential of
the cell content: high or low?
the ans is low but y low? isnt phloem sap filled wth sucrose n aminos?
--- End quote ---
yea its low because its not askin about the concentration of solutes in the phloem seive tube
its asking about solute potential, whcih decreases if there is an increased amount of amino acids or sucrose dissolved in it!
hope this helped ;)
sizbeauty:
nov08/q18..shuldn't it b C?
why is de ans A?
plz help me
unknown 101:
--- Quote from: sizbeauty on May 25, 2010, 07:51:58 pm ---nov08/q18..shuldn't it b C?
why is de ans A?
plz help me
--- End quote ---
ok so if substance X replaces telomere ( they are specialized DNA-protein complexes that cap the ends of the chromosomes. Their function is to help with replication of genetic material when cells divide and to protect the ends of the chromosome ends from degradation ).
so telomeres promote cell division and are then removed, soo the cell will keep on dividing!!
so with substance X : cell will divide continually
and without substance X : cell division eventually slows and stops ( cuz telomeres are now NOT being completley replaced, so at first they slow down cell division and then stop )
hope this helped .. :)
sizbeauty:
thx :) n can u also plz explain june07/q4???
thx alot :)
unknown 101:
--- Quote from: sizbeauty on May 25, 2010, 08:15:34 pm ---thx :) n can u also plz explain june07/q4???
thx alot :)
--- End quote ---
ok so from the top part of the question :
1 unit on stage = 100 on ocular graticule
so measure any of the pollen grains "at start" and "after 4 hours" then subtract ( after 4 hours - at start = about 5 units)
so 5x1/ 100 = 0.05
multiply the value by 100 to change it from ( 0.1 mm to micrometers) and you will get 5
hope this helped :)
iim not actually sure if its the right method, but thats how i got my answer :S
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