Noopur needs a lens of power -4.5D for correction of her vision.

a) What kind of defect in vision is she suffering from?

b) What is the focal length and nature of the corrective lens?

c) Draw ray diagrams showing the (a) defected eye and (b) correction for this defect.

d) What are the causes of this defect?

Draw the structural formulae of all the possible isomers of the compound with the molecular formula C₃H₆O and also give their electron dot structures.

(a) i) Draw a neat diagram of human brain and

ii) Label Medulla and Cerebellum

iii) Write the functions of the above-mentioned parts

(b) ”Both overproduction and underproduction of Growth hormone lead to disorders in the body.” Explain

a) What is reactivity series? How does the reactivity series of metals help in predicting the relative activities of various metals?

b) Suggest different chemical processes used for obtaining a metal from its oxides of metals in the middle of the reactivity series and metals towards the top of the reactivity series. Support your answer with one example each.

(a) “Improvements in our lifestyle have resulted in greater amounts of waste generation.” Give two examples to support the given statement. Suggest one change that we can incorporate in our lifestyle in order to reduce nonbiodegradable waste.

(b) The following organisms form a food chain. Insect, Hawk, Grass, Snake, Frog Which of these will have highest concentration of non-biodegradable chemicals? Name the phenomenon.