ICAR JRF Soil and Plant Nutrition — practice questions
44 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ICAR JRF Soil and Plant Nutrition in the app →Water typically makes up what share of the total weight of a plant?Where does the carbon that makes up most of the dry mass of a plant come from?Besides light and water, about how many elements do plants need for all their biochemical needs?Which of these is NOT one of the three criteria for calling an element essential?Which group lists only macronutrients?Which element is classed as a micronutrient?On average, what proportion of the dry weight of a cell is carbon?Which macronutrient is singled out for its role in regulating the opening and closing of stomata?Which nutrient is part of the amino acids cysteine and methionine?Phosphorus is necessary for the synthesis of which two classes of compound?The role of calcium in a plant is described as twofold. Which pair is correct?Which macronutrient is described as important to the photosynthetic process?Which set of symptoms follows a nutrient deficiency in a plant?Blossom end rot in tomato is caused by a deficiency of which nutrient?Intervenal chlorosis in a leaf is attributed to inadequate supply of which nutrient?Hydroponics is best described as which method?Soil is defined as which layer?A soil formed from the weathering of rocks and composed mostly of inorganic material is called what?Inorganic mineral matter makes up roughly what share of soil volume?In an ideal soil, how should the pore space be shared?Humus, the organic material of soil, is made up of what?Soil particles between 0.1 and 2 mm in diameter are classed as what?Which soil particles are smaller than 0.002 mm in diameter?The vertical section through a soil, made of layers with distinct properties, is known as what?Which set names the five factors that account for soil formation?Which horizon is an accumulation of fine material that has moved downward, forming a dense layer?The area of soil affected by root secretions and the microorganisms they encourage is called what?Why can plants not use atmospheric dinitrogen directly?Biological nitrogen fixation is carried out exclusively by which organisms?Biological processes contribute what share of the nitrogen used in agriculture?Which enzyme reduces atmospheric nitrogen to ammonia inside a root nodule?Soil bacteria that form nodules on legume roots are collectively called what?In the legume and rhizobia symbiosis, what does each partner obtain?Through mycorrhization, which nutrients does the plant mainly obtain?What share of the total carbon accessed by plants can mycorrhizal fungi obtain?How do ectomycorrhizae differ from endomycorrhizae?Endomycorrhizae are found in the roots of what proportion of terrestrial plants?How do fungal hyphae help a root overcome a nutrient depletion zone?Which term describes a parasitic plant that is fully photosynthetic and uses its host only for water and minerAbout how many species of parasitic plants are there?How do most saprophytic plants actually obtain their food?In a lichen, what does the algal partner contribute?Which two root types does an epiphyte have?What do the minerals obtained from trapped insects compensate for in a Venus flytrap?