Providing labels and caption to the given diagram, state the function of the lymph system. . (Do not
copy the diagram in your answer book. Write the label against the number indicated in the lines pointing
towards respective areas of the diagram in your answer book. You are also to write the caption and the
requirements of the question in your answer book.)
(e) State the function of endocrine glands and hormones as found in mammals and tabulate the hormone
secreted from the thyroid gland as given in text .
(OR)
State the process of birth as found in human and what occur after birth.
(f) State the role of the nucleus of cell including about its DNA and RNA associated with heredity.
(OR)
List the type of symbiotic relationships and explain the type where any one species benefits while the other
is neither benefited nor harmed.
(iv) What happens when ethyl chloride is heated with alcoholic solution of KOH.
(e) Give an account on the manufacture of sodium by Down process.
(f) Describe the laboratory preparation of iodine with a suitable diagram.
(g) 6.5 g of a mixture of sodium chloride and anhydrous sodium carbonate were made up to 500 cm3 of
aqueous solution. 25cm3 of this solution required 20 cm3 of 0.104M sulphuric acid for neutralization.
Calculate the percentage by mass of sodium chloride in the mixture.(C =12,O =16,Na =32).
(h) Discuss the extraction of lead from its corresponding ore.
