Qualification > Sciences
ALL CIE BIOLOGY DOUBTS HERE !!!
Aadeez || Zafar:
Yeh toh hamara kaam hein
**RoRo**:
Can someone please explain the following?
November 2006 - Q11 and 19
June 2005 - Q5
November 2004 - Q27, 30 and 38
June 2004 - Q32
November 2002 - Q26 and 32
June 2002 - Q 14 and 18
Thank you! :D
NidZ- Hero:
--- Quote from: The Secret on June 05, 2011, 11:03:21 pm ---Can someone please explain the following?
November 2006 - Q11 and 19
June 2005 - Q5
November 2004 - Q27, 30 and 38
June 2004 - Q32
November 2002 - Q26 and 32
June 2002 - Q 14 and 18
Thank you! :D
--- End quote ---
November 2006
Q11-ans A
Hot Water is less denser Than Cold water Cuz of that It brings the Dissolved nutrients to the surface
And Also water is called A universal Solvent it dissolve most of the Substance
Q29-ans B
Air pressure is much less as the alttitude increase thus the Partial pressure of Oxygen Decrease
Saturation of haemoglobin will be less (%)
So Less oxygen carried around the body Which Cause sickness
June 2005 - Q5- ans C
0.25 mol dm^–3 sucrose solution in order to maintain the organelles osmotic integrity. The respiratory substrate used by mitochondria is glucose, not sucrose.
November 2004 - Q38
Used for growth + used for other life process + respiratory heat losses( But this hw yu get the answers but i m nt sure y)
June 2004 - Q32 ans D
diffuses through the squamous epithelial cells of the alveolar wall and then through the endothelial cells of
the capillary wall or they failed to understand that the oxygen crosses two cell surface membranes as it
diffuses into and then out of each cell. The fifth membrane is, the surface of the red blood cell.
June 2002 -
Q 14 ans B
The substrate concentration is high the And the is nt free for the enzymes so the substrate molecules Wait for their turn
Q18 Ans C
Amelia:
--- Quote from: $H00t!N& $t@r on June 06, 2011, 05:30:18 pm ---A farmer wants to encourage the beneficial bacterial reactions involved in the nitrogen cycle in wheat fields. How can he do this?
A adding artificial nitrate fertiliser
B draining waterlogged fields
C growing the same crop every year
D irrigating fields
--- End quote ---
Okay, now I think the most likely answer is B. Draining waterlogged soils will discourage the reaction of denitrifying bacteria in the soil. Dentrifying bacteria reduce soil fertility by converting nitrates to atmospheric nitrogen. Not so beneficial for the wheat fields.
NidZ- Hero:
--- Quote from: $H00t!N& $t@r on June 06, 2011, 05:30:18 pm ---A farmer wants to encourage the beneficial bacterial reactions involved in the nitrogen cycle in wheat fields. How can he do this?
A adding artificial nitrate fertiliser
B draining waterlogged fields
C growing the same crop every year
D irrigating fields
--- End quote ---
Is the answer D
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