Plant Pathology - Study Mode
[#216] C 4 plants belong to
Correct Answer
(D) Both B and C
Explanation
Solution: C 4 plants belong to Monocots and Dicots. C 4 carbon fixation is one of three known photosynthetic processes of carbon fixation in plants. About 8,100 plant species use C 4 carbon fixation, which represents about 3% of all terrestrial species of plants. C 4 carbon fixation is more common in monocots compared with dicots, with 40% of monocots using the C 4 pathway, compared with only 4.5% of dicots. Despite this, only three families of monocots use C 4 carbon fixation compared to 15 dicot families.
[#217] The amount of organic matter by weight in organic soil is
Correct Answer
(A) > 20%
Explanation
Solution: The amount of organic matter by weight in organic soil is > 20%. Soils containing 12% to 18% SOC are generally classified as organic soils. Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize. Although these three elements make up about 92% of the dry weight of the organic matter in the soil, other elements are very important for the nutrition of plants, including nitrogen, phosphorus, potassium, sulfur, calcium, magnesium and many micronutrients.
[#218] Fertiliser use is profitable if each rupee spent on fertiliser produces crop worth at least
Correct Answer
(D) Rs. 2
Explanation
Solution: Fertilizer use is profitable if each rupee spent on fertilizer produces a crop worth at least Rs. 2. A fertilizer is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments. Data on the fertilizer consumption per hectare of arable land in 2012 are published by The World Bank.
[#219] Planned geographical distribution of major gene for specific resistance to pathogens for use in varietal development and production is referred to as
Correct Answer
(B) Gene deployment
Explanation
Solution: The planned geographical distribution of major genes for specific resistance to pathogens for use in varietal development and production is referred to as Gene deployment. Gene deployment is the guided distribution of genes in space and time. Gould divided the gene deployment strategies into two broad categories- 1) spatial (gene deployment at the farm level, at the field level, and the region level) and 2) temporal.
[#220] Stage-III of rust fungi is marked by
Correct Answer
(D) Teleospores
Explanation
Solution: Stage-III of rust fungi is marked by Teliospores. Teliospores have been defined as the basidia-producing spores of rust fungi. The teliospores are important for the overwintering of most cereal rosts, and they are largely responsible for the formation of new physiologies races of the rosts. Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales.