Name two fertilizers supplying N, P, K to crops.

What are the factors on which irrigation requirements depend?

What are the various irrigation systems adopted in India?

How are diseases transmitted in crops?

How do weeds damage crops?

Which crops are grown in green manured field? Give examples.

From where do the plants get carbon, oxygen and hydrogen?

What is common in poultry, fisheries, and bee-keeping with respect to the increase in production of animals?

Name the organism used in the preparation of vermicompost.

(i) What are the harmful effects of pesticides and fertilizers over a long period of time on soil?

(ii) Define Humus.

State two disadvantages of fertilizers.

What is hybridisation in plants? Mention any two desired characters for which it is done.

How does the use of fertilizers improve crop production?

Though fertilizers increase crop production, they are to be used in limited amount. Why?

Why is chemical method of controlling pests not considered good?

Give two reasons why fertilizers have to be regularly used in agriculture.

How are fertilizers grouped?

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

Why do we irrigate our crops?

Differentiate between fumigation and spraying.

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.

What are the differences between broilers and layers with respect to their purpose of breeding and daily food requirement? What necessary steps have to be taken to prevent the occurrence of infectious diseases in poultry farm?

What is the composite fish culture? Give its two advantages.

Explain plant breeding.

Why should we adopt crop rotation?

Why are legumes desired in crop rotation?

Describe the role of fertilizers and irrigation in improving crop yield. Mention any one effect of each if it used in excess.

Raghu had a poor yield due to the failure of the crop. His father Rajan suggested that he should grow two or more crop simultaneously in his field as this would reduce the risk of loss. He suggested two crops that can be grown together.

(i) Write the name of the cropping pattern which his father suggested.

(ii) Write the names of the examples of crops given by his father.

(iii) Mention any two values that are worth appreciation in his father’s behaviour.