Agronomy MCQ Question and Answer | Agriculture MCQ Question

A grassy stunt virus disease of rice is transmitted by Brown plant hopper nymphs and adults. It transmits in an area where rice is grown all around the year. The macropterous forms or long-winged adults of the insect are more important in spreading the disease than the short winged forms. They feed on the diseased plant for at least 30 minutes to pick up the virus.

The mineral matter of soil is comprised of eight main elements, Oxygen, silicon, Aluminum, Iron, Magnesium, Calcium, Sodium and potassium. Out of these Oxygen is most prevalent on both and volume basis and is the only negatively charged ion, which combines with other cations in different ratios to form different compounds required for the proper growth and development of the plant.

China is the hub of hybrid rice, it is the country where hybrid rice was developed for the first time and is grown on a large scale. It is estimated to be planted on more than 50% of rice growing fields. China is the largest producer of rice in the world, making up 30% of global rice production.

The use of GMO crops is not allowed in organic farming in India. GMOs has genetically modified organisms or seeds or products are prohibited as an organic product. That means any organic farmer cannot grow GMO seeds. Even organic farmers who will suffer any contamination can lose their organic certification and the premium they earn for their organic crop.

Safflower is the false saffron, the scientific name Carthamus tinctorius belongs to the Compositae or Asteraceae family. It is a diploid oilseed crop used in cosmetics and as edible vegetable oil.

Hygroscopic water is the water found on the soil as an extremely thin tightly held film around the soil particles, it is absorbed as moisture from the air. It is found not only in pores but also on the surface of soil particles. It can be retained from the soil by over drying at 105 degrees Celsius and pressure at 31 bar.

The land equivalent ratio is a term that describes the relative land area required under sole cropping to produce the same yield as under intercropping. It can be used whenever more than one type of yield can be obtained from the same area.

The oxygen Evolving complex in Photosystem II contains a cluster of one calcium, four manganese atoms, and traces of chlorine. It is responsible for the oxidation of water to oxygen in plants, algae and cyanobacteria. This cluster of atoms serves as a model for the splitting of water by energy obtained from sunlight.

Hydrogen has three isotopic forms which are hydrogen, Deuterium and tritium. All of them have one single proton but a different number of their neutrons. Hydrogen (Protium) contains one neutron, deuterium contains two neutrons whereas tritium contains 3 neutrons.