A student takes four test tubes marked P, Q R and S of 25 mL capacity and fills 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as-KCl in P, NaCl in Q CaCI₂ in Rand MgCI₂ in S. He then adds about 2 mL of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked:

(a) Write the function of each of the following parts of human eye:

cornea; iris; crystalline lens; ciliary muscles

(b) Millions of people of the developing countries of the world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organize a campaign in your neighbourhood in order to create awareness about this fact. you are asked to participate in this mission how would you contribute in noble cause?

(i) State the objective of organizing such campaigns.

(ii) List two arguments which you would give to motivate the people to do their eyes after death.

(iii) List two value which are developed in the persons who actively participate and contribute in such programmes.

Which of the following sets of materials can be used for conducting a saponification reaction for the preparation of soap?

Consider the following comments about saponification reactions:

(I) Heat is evolved in these reaction.

(II) For quick precipitation of soap sodium chloride is added to the reaction mixture.

(III) Saponification reactions are special kind of neutralization reactions.

(IV) Soaps are basic salts of long chain fatty acids.

The correct comments are:

A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds: