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CBSE->Plus 2 Biology Science Questions

Total Questions 190
a given quantity of metal is to be cast in to a solid half circular cylinder (with rectangular base and semicircular ends )show that in order that the total surface area may be minimum ,the ratio of the length of the cylinder to the diameter of its circular ends is pi:pi+2?
if the sum of the length of the hypotenuse and a side of a right angled triangle is given show that the area of triangle is maximum when angle between them is pi/3?
how do the marine invertebrates and fishes live at great depth in oceans where the pressure could be >100 times the normal atmospheric pressure and do they have any special enzymes?
define phenotypic adaptation with example?
how do fishes thriving in antarctic waters manage to keep their body fluids from freezing?
how do the organisms living in the habitats that may vary drastically in time cope or manage with stressful conditions?
among the red ,green and brown algae that inhibit sea which is likely to be found in the deepest water?why?
what is the source of energy for inhabitants of deep(>500m)in the oceans?
how can the distributional range of some species be affected if increasing increasing global temperature continues?
give examples for eurythermal and stenothermal animals and plants
what are the key elements that lead to so much variations in the physical and chemical conditions of different habitats?
how does the chick recognise her own mother?
why are night blooming flowers generally white?
what is genitic engineering?
can we write Nernst eequation as E(cell)=emf + 0.0592/n log oxidised state /redused state?
what are CBD and MAB?
show that the function f(x)=|x+2|is continuous but fails to differentiable at x=-2
what are the causes of resistance?
what are CBD and MAB?
how we can determine blood grouping in human beings?