Among Nature’s most intriguing phenomena are the partnerships formed by any different species. The name used for these relationships, Symbiosis, comes from Greek meaning "living together". Not all symbiotic relationships are the same. There are some called commensal relationships, in which one partner gains a benefit while the other gains little or none but is not harmed. One example is the relationship between two types of fish remoras and sharks. The remora, which is long and often striped, attaches itself to a shark (sometimes to another type of fish or a whale), using a sucker on its head. When the shark makes a kill, the hitchhiker briefly detaches itself to feed on the scraps. Another type of symbiotic relationship is parasitism, in which one partner benefits at the expense of others. Ticks and tapeworms are among familiar parasites. 

The third type of symbiotic relationship, called mutualism, is a true partnership in which both partners benefit. The relationship may be limited as when zebras and wild best graze together on the vast African grasslands. Each species can survive on its own, but together their chances of detecting predators are improved because each contributes a specially keen sense. (Zebras have the better eyesight;  wild beast, hearing and sense of smell). In a few cases partners are so interdependent that one cannot survive without the other. Most mutualistic relationships probably lie some where in between

Remora attaches itself to the shark or whale 

Direction(14): In each of the following questions, choose the correctly spelt word.

Direction: Read the following passage carefully and answer the questions given below it. Certain words / phrases have been printed in bold to help you locate them while answering some of the questions

Princess Chandravati was very beautiful. She loved all kinds of ornaments and always wanted to wear the most precious and lovely jewels. Once, a jeweler came to the palace and gifted the King a wonderful diamond necklace. It glittered with big and small diamonds. It was certainly a very expensive necklace. The princess fell in love with it as soon as she saw it. So, the king presented it to her.
 From that day on, the princess always wore that necklace, wherever she went. One day before, going for a swim in the pond, she took the necklace off and put in the hands of her oldest and the most trustworthy servant. "Hold this and be careful. This is the most precious necklace in the whole world, " she said. The Servant was an old woman. She sat under tree, holding the ornament tightly and waited for the princess. It was a hot afternoon and the servant was very tired so she dozed off under the tree. Suddenly the servant felt that someone was tugging at the necklace and she woke up with a start. She looked around but it no one was there and the necklace was gone. Scared out of her wits, the old servant started screaming. On hearing her scream the royal guards rushed to her. She pointed towards the direction in which the thief may have gone and the guards ran off that way.
 There was a poor and dim-witted farmer walking on the same road. As soon as he saw the royal guards running towards him, he thought that they wanted to catch him and started running. But he was not a strong man and could not outrun the hefty guards. The royal guards caught him in no time. “Where is it? " they demanded. shaking him. “Where is what? " the poor farmer stammered back. The necklace you stole!" thundered one of the royal guards. The farmer had no idea what they were talking about. He only understood that some precious necklace was lost and he was supposed to have it. He quickly replied, " I don't know where it is now. I gave it to my landlord.”

The guards ran towards the landlord 's house. "Give us the necklace right now ! " the guards demanded of the at landlord. "Necklace? I don’t have any!" the stunned landlord replied. Then tell us quickly who “does demanded the soldiers. In order to get the royal guards off his back, the landlord pointed towards a priest who was walking by his house and said, "He does." The guards now caught hold of the priest who was walking towards the temple and thinking about the lunch he had just eaten. The priest was stunned when one of the burly guards jumped on him and asked about the necklace. He remembered that the minister, Bhupathi, was at the temple. He took the guards to the temple and pointed towards the praying minister, “I gave it to him, "he said. Bhupati too was caught and all four men were thrown in jail. The Chief Minister of the kingdom knew Bhupati well and was sure that Bhupati would never steal. He decided to find out who the culprit was. He hid near the jail where all four men were put and heard them talking First, Bhupati asked the priest, “Panditji, why did you say that you gave the necklace to me? I was quietly praying at the temple and now you have landed me in jail for no fault of mine.” The priest looked apologetic. He pointed towards the landlord and said, " I didn’t know what to say. He set the " guards on me. I was simply passing by his house and was on my way to the temple." The landlord looked at the priest sheepishly. Then he turned towards the poor farmer and yelled. “You lazy good-for-nothing man! Why did you say that I had the necklace? " The farmer, trembling under the angry gaze of all three men, said, " I was just walking home. The guards caught me and I did not know what to say." On hearing, this conversation, he Chief Minister understood that all the four men were innocent. He immediately ordered the royal guards to search thoroughly, near the pond. The guards searched high and low till they saw something clinging the tree. On the tree sat a monkey with the princess’ favorite necklace around his neck. It took a lot of coxing and bananas before the monkey threw the necklace on the ground. The’ king apologized to at the four men and gave them gold coins as compensation. He requested his daughter to wear the necklace only indoors.

Why did the Chief Minister decide to intervene in the case of the stolen necklace?

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

AIDS tests should be______ by law for everyone.

Read the following passage carefully and answer the questions given below it. Certain words/phrases are printed in bold to help you to locate them while answering some of the questions.

Survival is the most essential factor for every living organism. People resort to different tricks to make both ends meet. One such live instances is mentioned here. Villagers of Makhrada village believed that a witch lived in the denseforest near Makhrada. The passers by were much harassed by the witch who used to frighten them and also took their belongings. In the village there lived a young man named Dhiru who was fond of adventures. When he heard about the witch, he did not believe that it was one of the witches who ate flesh. But there was something elseabout the witch, which made Dhiru curious. She did not eat flest but took away the belongings of the people. Therefore, he was keen to solve this mystery.

He set out with a bag of mangoes. He walked through the forest till it was midway. He took shelter under a shady tree and pretended to be fast asleep. However, after some time, he really fell as leep. After a while, he felt that someone was trying to snatch his bag of mangoes, Suddenly, he woke up and caught hold of the person. It was the witch who tried to frighten Dhiru and run away. But Dhiru was strong and bold enough to hold the withc fast. The witch finally surrendered. Dhiru forced has to tell him who she really was. The witch removed her mask and narrated her and story. She told that she was a poor old widow and she had nobody to look after her. Therefore, she used to live in the forest, wearing a fearful-looking mask. People passing through the forest got frightened due to her appearance and took her for a witch. She then robbed the people of their belongings to make both ends meet. Dhiru took pity on her and gave her the bag of ranages.

What made Dhiru curious? 

In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.

China is the largest producer of pork, but it (1) ______ a big problem at the moment. There is an epidemic (2) _____ is killing its pigs. The virus was first (3) _____ in August last year, but one million pigs have died by now. It is a (4) ______ virus and when a pig catches it, it dies. China thinks that one third of (5) ______ pigs are going to die by the end of this year. 

Select the most appropriate option for blank No. 1.

Select the option that can be used as a one-word substitute for the given group of words.

A pause between the acts of a play

Select the option that can be used as a one-word substitute for the given group of words.

A book that contains information on various subjects