If the concentration of glucose is increased from 0.1 m to 2.0 m, will the conductance change? why?

             No, the conductance will not change.

                    Conduction is defined as the transfer of energy in the form of heat or electric charge through any given substance. Electric charge is the movement of electrons from high potential to lower potential. Hence, we can say that electrons can travel through either a metallic substance (having sea of free electrons) or Ionic compounds (having +ve and -ve ions).

                     In given statement, Sugar (Glucose; C₆H₁₂O₆) is a covalent compound. It neither has free electrons in it structure nor it is an ionic compound to produce ions. Hence, due to absence of both it will not conduct electricity in solution form either its concentration is kept high or kept low.

pla·gia·rism

/ˈplājəˌrizəm/

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

explanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.