Read the following passage and answer the questions that follow:

The water of river Yamun in Delhi has become lifeless. The river’s water quality is most polluted and has received ‘E’ grade. This is the lowest grade which indicates the severity of pollution in water. Some fifty years ago, the water of the Yamuna was clear and clean.

Many water plants such as weed, algae and shrubs grew in the water. These plants were also the main source of food for aquatic creatures, But what we find now are red worms, which live in the most unhygienic and polluted water.

 Questions:

(i) How is the water of river Yamuna at present?

 (ii) What did it get ‘E’ grade?

 (iii) What grew in the water when the Yamuna was clean?

 (iv) What do we find now in its water?

OR

Read the following passage and answer the questions that follow:

Language is a wonderful gift given to man. No animal possess this gift, but they have their own way of expressing themselves. When a rabbit sees an enemy, it runs into th hole. Its tail, which is white, bobs up and down when it runs. The other rabbits see it, they run too. They know that there is a danger, Similarly, a bee dances and lets other bees know that it has found food. Similarly, a dog barks when a stranger comes near.

Questions:

(i) How does a rabbit react when it sees an enemy?

(ii) What do the other rabbits do?

(iii) How does a bee let other bees know about food?

(iv) What does a dog do?