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:

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

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 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:

Which of the following is a correct set of homologous organs?