Some species of fishes can be cultured in a single fish pond. These fishes do not compete for food as they have different food habits. In the following columns fishes are matched according to their food habits. Select the incorrect match

(1) Labeo rohita - Column feeder
(2)  Catla catla - Surface feeder
(3) Cirrhinus mrigala - Bottom feeder
(4) Common carp - Surface feeder

Select the correct answer about manure

(1) Manure contains large quantities of organic matter and small quantities of nutrients.
(2) It increases the water holding capacity of sandy soil.
(3) It helps in draining out of excess of wat er f rom clayey soil.
(4) Its excessive use pollutes environment because it is made of animal excretory waste.

Which is the improved hybrid variety of Wheat ?

(1)  Sona
(2)  Sonalika
(3)  PS-16
(4)  Paras

Identify the macronutrient

(1) copper
(2)  zinc
(3) sulphur
(4) Boron

Weeds affect the crop plants by

(1) Killing of plants in field before they grow
(2)  Dominating the plants to grow
(3) Competing for various resources of crops (plants)
(4) All the above