I may NOT be an authority on this subject, but I have attempted this very topic, so here I will critically comment on your expansion.
Quote:
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Originally Posted by acme
"Variety is the spice of Life
Variety’s the very spice of life,
That gives it all its flavor.
--William Cowper
God has created this enormous universe with the essential ingredient of ‘variety’. And this ingredient has been playing its role since its injection into the body of universe. |
1.The quotation at the start fits in but the very first two sentences of the paragraph does not go well with this poetical or literary topic.
The use of Variety as Ingredient in the above sentences does not give the desired result, see, it may be grammatically correct, but it's not all, the idea of expansion of a topic is that the examiner wants to make sure the you can understand the intricacies of the language.
I can suggest that you should go for a literary or classic start as following:
The hues of autumn leaves,from brown to orange and from red to yellow, the full blooming of flowers in spring and the chirping of birds, and the solitary snowman meditating in winter, if it were not for variety and diversity, this life would have lost its charm to monotony. Variety is the spice of life, the very soul of being alive! ( I just wrote it now, may be you can find some mistakes in it and pardon me for this)
You can take a start like this, see, the above starting sentence is so full of variety and deiversity, that it goes well with the topic, this you have to prove in this type of question that yes, you can grab the mood of the topic and write about it.
2. The following sentence of yours is grammatically correct, but it lacks the taste of any classical writing: QUOTE:
"Various planets, various continents, various countries, various climates, various cultures, various civilizations, various languages, etc. make this world beautiful, enchanting and worth-living for its various inhabitants."
The use of the word "various" gives a bad taste, you should use some VARIETY of words instead of this, and this word is repeated many times, just avoid it in paragraph writing.
You can write it like this:
Various continents and countries, languages and cultures, the different and diversified civilizations and customs make this world a beautiful place to live in.
3. This sentence of yours,
"There is no static factor which makes man a symbol of ‘uniformity’. Variety encircles him and makes him dynamic" is a good one
4. The end sentences of yours is a good effort;
Variety fills color in the checkered picture of life but uniformity fades it. Variety brings happiness and pleasure in life but uniformity slowly poisons it. In short , variety is the soul of pleasure and pleasure is the soul of life.
Just want to suggest to you regarding this that don't repaet a word to much like in the above case, Variety and Uniformity.
You can use Diversity, different, distinct instead of this single word. And for Uniformity, you can use Monotony, dryness and colourlessness.
Hope that you have not mind my dissection of your paragraph 
Regards,
Nonchalant!