Differentiate between fumigation and spraying.

Explain how excessive use of nitrate fertilizers in agricultural fields affect human life.

Why do we irrigate our crops?

Mention any one difference in external features of weeds and wheat plant. How do weed affect crop yield? Describe how weeds are removed.

(i) Write any two exotic (foreign) breeds of cow.

(ii) Write the names of any two popular varieties of marine (salt water) fish.

(iii) Name one indigenous and one exotic breed of fowl.