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Recent content by phanttasy
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Mathematics: Post your doubts here!
Need help on this question ! :( I couldn't get the answer after many times of trials, 2010 O/N paper 33 question 8 ii) b) -
Mathematics: Post your doubts here!
need help on this ! thanks part (ii) -
Hi! I just downloaded the topical pass year fro P3 Mathematics. Can I know the topical pass year...
Hi! I just downloaded the topical pass year fro P3 Mathematics. Can I know the topical pass year is from which until which year? Does it includes all variant?- phanttasy
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A level Biology: Post your doubts here!
In many seedless vascular plants, the endodermis is a distinctly visible layer of cells immediately outside the vascular cylinder (stele) in roots and shoots. In most seed plants, especially woody types, an endodermis is absent from the stems but is present in roots. -
Chemistry: Post your doubts here!
enthalpy change of combustion means the enthalpy change when 1 mole substance is burnt completely in excess oxygen. Let the answer in c(i) be x If 0.32g give you x J of energy Then 1 mole (86g) gives you 86x/0.32 since the enthalpy change of combustion is always exothermic, so the sign is... -
Chemistry: Post your doubts here!
see attachment for the explanation hope you can understand:D -
A level Biology: Post your doubts here!
There are cohesion force between water molecules and adhesion force between the water molecules and the wall of the xylem vessel. During the day, the rate of transpiration is high, more water is evaporate from the moist mesophyll cell wall. This set up a great water potential gradient between... -
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A level Biology: Post your doubts here!
according to the question, it says the blood usually moves from LA to RA we can't go against the question -
A level Biology: Post your doubts here!
27: waterlogged soil -> lack of oxygen -> aerobic respiration decrease -> less ATP is synthesis -> less ions is actively transport into the the root hair cell -> root pressure decrease 30: D because the blood is moving from the left atrium(LA) to the right atrium(RA), the volume of blood of RA... -
A level Biology: Post your doubts here!
20: nitrogenous bases are read as 3. Meaning 3 nitrogenous bases codes for one amino acid. Therefore 12/2 = 6, 6/3= 2. Ans is 2 x 10^3 23: Divide first time you get 100% hybrid DNA (as mentioned in the question). Divide twice you get 50% hybrid and 50% containing only 14N. Divide 3 times, you... -
A level Biology: Post your doubts here!
Not sure about number 5 too.. from my calculation my answer is not accurate but it is quite close to the answer.. See the attachment for questions 17 and 23 for Q25, the overcome the friction, the blood is pumped at a high pressure. Smooth muscle only vasodilate and vasoconstrict. -
A level Biology: Post your doubts here!
see the picture for the working. the question ask the total time when both atrio-ventricular(AV valve) and semi-lunar valve(SL valve) closed at same time so the time is basically the time between closing of (AV valve / SL valve) and the time just before the opening of (SL valve / AV valve) the... -
A level Biology: Post your doubts here!
Not very sure about the plant part but I think is like this... Blue represent hyrdrophilic region and yellow represent hydrophobic region Please correct me if i am wrong! Let learn from the mistake ：D I just a student who will be completing his AS soon haha ! hope you can understand my...