Tamil Nadu Board - Class 9

World & Indian History question bank (Social Science (சமூக அறிவியல்))

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Q1.

Plant & Animal Physiology: What is the physiological role played by 'Evolution of Humans and Society' (Auxin/Insulin/Nephron)?


(A)
Regulating blood glucose, apical dominance in plants, or nitrogenous waste filtration (Evolution of Humans and Society)
(B)
Cellular destruction
(C)
No endocrine action
(D)
None of these
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Q2.

Organic Chemistry: What is the reaction mechanism for esterification involving 'Evolution of Humans and Society'?


(A)
$CH_3COOH + C_2H_5OH \xrightarrow{conc. H_2SO_4} CH_3COOC_2H_5 + H_2O$ (fruity ester odour) (Evolution of Humans and Society)
(B)
No ester formed
(C)
Produces toxic gas only
(D)
None of these
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