Q18 of 33 Page 1

(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) (i) The diagram of the human brain is given as below:



(ii) Cerebellum controls and coordinates muscular activity and maintains the posture and balance of the body.


(iii) Medulla oblongata controls functioning of internal organs and involuntary actions like beating of heart, breathing movement, peristalsis movement etc.


(b) Over production of growth hormones cause gigantism in childhood and acromegaly in adults. Similarly, undersecretion causes dwarfism in a child.


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17

You are given balls and stick model of six carbon atoms and fourteen hydrogen atoms and sufficient number of sticks. In how many ways one can join the models of six carbon atoms and fourteen hydrogen atoms to form different molecules of C6H14.

 17

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

 19

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?

 20

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.