Plant Pathology MCQ Question and Answer | Agriculture MCQ Question

The chemical composition of basic slag is (CaO)₃P₂O₅, SiO₂.
Slag is a by-product of smelting (pyrometallurgical) ores and used metals.
Basic slag systems are made up primarily of limestone, particularly calcium carbonate (CaCO₃), which helps provide good impact properties at low temperatures.
Basic slag is low in silica and high in base-forming oxides that are used in the basic process of steelmaking and that are subsequently useful as a fertilizer.

In the case of the C₄-pathway, CO₂ combines with PEP.
The CO₂ combines with ribulose bisphosphate and goes through the Calvin cycle while the pyruvate re-enters the mesophyll cells, reacts with ATP, and is converted back to phosphoenolpyruvate, the starting compound of the C₄ cycle.
PEP carboxylase attaches an incoming carbon dioxide molecule to the three-carbon molecule PEP, producing oxaloacetate.

An element essential for the photolyisis of water is Carbon.
Photolysis is the chemical process by which molecules are broken down into smaller units through the absorption of light.
In this process of photolysis, H₂O molecules are broken into hydrogen ions, electrons, and oxygen atoms.
Other mineral ions required for the photolysis of water are manganese, calcium and chlorine.

A chemical which absorbs light energy and changes it to chemical energy is Chlorophyll a.
Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light, and it is a poor absorber of green and near-green portions of the spectrum.
Chlorophyll a also transfers resonance energy in the antenna complex, ending in the reaction center where specific chlorophylls P680 and P700 are located.

Polyembryony occurs in Citrus.
Citrus exhibits polyembryonic seed development, an apomictic process in which many maternally derived embryos arise from the nucellus surrounding the developing zygotic embryo.
Citrus seed storage proteins were used as markers to compare embryogenesis in developing seeds and somatic embryogenesis in vitro.

In chiropterophily, pollination is performed by Bats.
The pollination of plants by bats is called chiropterophily. Plants pollinated by bats often have pale nocturnal flowers.
These flowers are often large and bell-shaped, and some bats have evolved specifically to reach the nectar at the bottom of them.

The rust of linseed and flax can be completely controlled by a spray of Borax.
Melampsora lini, while of economic importance as the causal agent of rust disease of flax and linseed.
Borax can remove rust from outdoor furniture, household appliances, garden equipment, metal surfaces, and more. Mixed with warm water and lemon juice, Borax becomes a paste. Leave the paste on for at least 20 minutes, then wipe off the rust.

Iron deficiency starts when it is < 55 ppm.
Iron (Fe) deficiency chlorosis is a major nutritional disorder for crops growing in calcareous soils and causes decreases in vegetative growth as well as marked yield and quality losses.
Soil iron concentration is high, but can become unavailable for absorption if soil pH is higher than 6.5.

Early blight of potatoes is Soil borne disease.
Early blight and late blight are terrible soil-borne diseases. Early blight also called Alternaria is a soil-borne fungal vector with the main two species being Alternaria solani and Alternaria alternata.
The disease affects leaves, stems and tubers and can reduce yield, tuber size, storability of tubers, quality of fresh-market and processing tubers and marketability of the crop.
Alternaria species cause dramatic leaf losses in growing potato crops which in turn can reduce yields by up to 30%.

Flashing light experiments on photosynthesis were performed by Emerson and Arnold.
Emerson and William Arnold found that "the yield per flash reached a maximum when just 1 out of 2500 chlorophylls absorbed a quantum".
Next, in 1939, Emerson demonstrated that between 8 and 12 quanta of light were needed to produce one molecule of oxygen.