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

The enrichment of water bodies with nutrients leading to excessive growth of phytoplankton is known as

(1) Nitrification
(2) Ammonification
(3) Eutrophication
(4) Phyto - enrichment

Which is the improved hybrid variety of Wheat ?

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

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.

Prior to sowing of crop seeds, these plants are grown and then mulched by ploughing them into the soil. Which of the following statements is not correct about them?

(1) These plants turn into a kind of manure called vermicompost
(2)  These include sunnhemp, guar, Berseem etc
(3) These plants help in enriching the soil in nitrogen and potassium
(4) Both (1) & (3)