Read the passage given below and answer the questions that follow:
The water of the river Yamuna in Delhi has become useless. The water of this river is most polluted and has received E grade in terms of quality. This is the lowest grade which indicates the severity of pollution in the water. Some fifty years ago the water of the Yamuna was clear and clean. Many water plants such as weeds, algae and shrubs grew in its water or along the bank of the river. These plants were the main source of food for aquatic creatures. A number of waterbirds could be seen along the river. With the onset of winter thousands of migratory birds would come here to feed in the Yamuna water. Sadly these water species and birds have vanished or died. What one finds now are red worms, called Chironomids which live in the most unhygienic and polluted water.
Complete the following:
(i) The water of the river Yamuna in Delhi …....... .
(ii) A number of waterbirds could be seen ……….. .

Explanation

(i) has become useless.
(ii) along the river.