Which among the following is the most common method of pollination in flowers without petals?

• wind

• water

• insects

• all the above

Earthworms and leeches belong to which phylum?

• arthropoda

• annelida

• hemichordata

• chordata

Which fertilizer produce acidity in soil

• Ammonium sulfate

• Sodium nitrate

• Calcium ammonium nitrate

• Calcium nitrate

Soil colloidal particle shows the phenomena

• Plasticity

• Adhesion and cohesion

• Flocculation

• All of the above

Microorganism involve in conversion from nitrite to nitrate

• Nitrosomonas

• Nitrobactor

• Pseudomonas

• Bacillus

Aroma of earthy smell in first shower of monsoon is due to _____

• Actinomycetes

• Bacteria

• Fungi

• None of the above

Red colour of soil is due to _____

• Hematite

• Geothite

• Glauconite

• Maghemite

Which instrument is used for the estimation of potash (K)

• Spectrophotometer

• Flamephotometer

• Colorimeter

• Atomic absorption

Spectrophotometer is used for determination of _____ in soil

• nitrogen

• phosphorus

• potassium

• all the above

Which of the following is a ripening hormone

• GA-3

• Auxin

• Cytokinin

• Ethylene