Plant Pathology - Study Mode

[#906] Greatest producers of organic matter are
Correct Answer

(D) Phytoplankton of oceans

Explanation

Solution: The greatest producers of organic matter are phytoplankton of oceans. Phytoplankton is the autotrophic component of the plankton community and a key part of ocean and freshwater ecosystems. Phytoplankton obtains their energy through photosynthesis, as do trees and other plants on land. This means phytoplankton must have light from the sun, so they live in the well-lit surface layers of oceans and lakes. The compartments influenced by phytoplankton include the atmospheric gas composition, inorganic nutrients, and trace element fluxes as well as the transfer and cycling of organic matter via biological processes.

[#907] Who is regarded as the father of Modern Indian phytopathology?
Correct Answer

(A) K. C. Mehta

Explanation

Solution: K. C. Mehta is regarded as the father of Modern Indian phytopathology. Phytopathology is the scientific study of diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). Karam Chand Mehta obtained his Ph.D. (1922) and ScD (1941) from the University of Cambridge, UK specializing in plant pathology. Mehta investigated the effect of temperature on the viability of uredospores of rust fungi attacking wheat, namely the black, brown and yellow rusts.

[#908] How much farmyard manure is required for obtaining 60 kg nitrogen for a crop?
Correct Answer

(B) 120 tonnes

Explanation

Solution: FYM (farmyard manure) is an important organic resource for agricultural production in livestock-based farming systems in the semi-arid tropics of India. The chemical composition of FYM is nitrogen is 0.5% nitrogen and 0.2% phosphate. 0.5% potassium and 76% of water. For 60 kg of nitrogen for a crop, 120 tonnes of farmyard manure is required as 1 ton of FYM contains 0.5 kg of Nitrogen.

[#909] A specific function of light in the process of photosynthesis is
Correct Answer

(C) Split water molecules

Explanation

Solution: A specific function of light in the process of photosynthesis is Split water molecules. In these light-dependent reactions, some energy is used to strip electrons from suitable substances, such as water, producing oxygen gas. The hydrogen freed by the splitting of water is used in the creation of two further compounds that serve as short-term stores of energy, enabling its transfer to drive other reactions these compounds are reduced nicotinamide adenine dinucleotide phosphate (NADPH) and adenosine triphosphate (ATP), the "energy currency" of cells.

[#910] The contribution of fertilisers to increase in food production is
Correct Answer

(D) 50%

Explanation

Solution: The contribution of fertilizers to the increase in food production is 50%. A fertilizer is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Increased use of nitrogen fertilizers has been a crucial component of the increased productivity of conventional food systems (more than 30% per capita) as part of the so-called "Green Revolution". This transition was important in transforming the global food system, allowing for larger-scale industrial agriculture with large crop yields.