Question 2:

The _______ is the only bird that can swim, but not fly. It is also the only bird that walks upright.

Question 3:

__________ is also known as coniferous forest or boreal forest. They are found in Canada, northern Asia, Siberia, Denmark, Norway, Sweden, and Finland.

Question 4:

 ‘Grass’ is the most important plant in the _________ ecosystem.

Question 5:

_________ is the coldest of all the ecosystems. It covers about one fifth of the land on earth.

Question 6:

The three types of coral reefs are fringing reefs, barrier reefs, and _________

Question 7:

Molluscs have soft bodies and don’t have skeleton. Snails, Clams, mussels,--------- and squids are few examples of molluscs.

Question 8:

 Only __________ plants such as tussock grasses, small-leafed shrubs, and dwarf trees grow in the Alpine ecosystem.

Question 9:

_______ is the largest of the hot deserts.

Question 10:

Corals are tiny _______ called polyps.