There are three main groups of oils-animal, vegetable and mineral. Great quantities of animal oil come from whales, creatures of the sea, which are the largest of the animals remaining in the world. To protect the whales from the cold of the Artic seas, nature has provided them with a thick covering of fat, called blubber. When the whale is killed, the blubber is stripped off and boiled down. It produces a great quantity of oil which can be made into food for human consumption. A few other creatures yield oil, but none so much as the whale. The livers of the cod and halibut, two kinds of fish, yield nourishing oil. Both cod liver oil and halibut oil are given to sick children and other invalids who need certain vitamins. 
Vegetable oil has been known from very old times. No household can get on without it, for it is used in cooking. Perfumes may be made from the oils of certain flowers. Soaps are made from eatable and animal products and the oils of certain flowers. 

The main source of animal oil, is –

Select the correct prefix/suffix to change the form of the given word. 

Neat

Direction: In the following question, out of the four alternatives, choose the one which can be substituted for the given sentence.

The statistical study of the population

Directions: In each of the following questions, sentences are given with blanks to be filled in with appropriate words(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four and indicate your choice for the correct answer.

The climate is not conducive_____ good health. 

Direction: In the following question, out of the four alternatives, choose the one which can be substituted for the given sentence.

Read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is (e), No error.
Each participant are (a) / expected to be present (b)/ at least an hour (c) / before the competition. (d) / No error (e).

Improve the sentence: Neither he nor I were there. 

Choose the world which is most nearly the same in meaning of the word.
Exquisite