Q1Written answer
Name a plant, which accumulates silicon.
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Worked solution
Oryza Sativa (Asian Rice) is one such plant which accumulates silicon.
NCERT Exemplar · Class 11 · Biology
Chapter 12: Mineral Nutrition
Practice each question, then open the answer or worked solution.
VERY SHORT ANSWER TYPE QUESTIONS
16 questionsQ2Written answer
Mycorrhiza is a mutualistic association. How do the organisms involved in this association benefit from each other?
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Worked solution
Fungi get carbohydrates from the plant for its growth. The fungi, in turn, acts as the extension of root hairs and helps in increased absorption of the mineral and nutrients from the soil.
Q3Written answer
Nitrogen fixation is shown by prokaryotes and not by eukaryotes. Comment.
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Nitrogen fixation is the process in which the atmospheric nitrogen is converted to ammonia (NH3) in the presence of an enzyme Nitrogenase. This process is in prokaryotes due to the presence of nitrogenase.
Q4Written answer
Carnivorous plants like Nepenthes and Venus flytrap have nutritional adaptations. Which nutrient do they especially obtain and from where?
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Carnivorous plants like Nepenthes and Venus flytrap grow in nitrogen-deficient soil which causes them to have a nitrogen deficiency. Nitrogen is obtained by trapping an insect in their cavity
Q5Written answer
Name a plant which lacks chlorophyll. How will it obtain nutrition?
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A plant called ‘Cuscuta’ is a stem parasite which does not have chlorophyll. They obtain nutrition from the host plant.
Q6Written answer
Name an insectivorous angiosperm.
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Utricularia (Bladderwort) is an insectivorous angiosperm.
Q7Written answer
A farmer adds Azotobacter culture to the soil before sowing maize. Which mineral element is being replenished?
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Azotobacter is nitrogen-fixing bacteria in cereal crops like maize. Which means it converts free nitrogen in the air to ammonia (NH3) or other related nitrogenous compounds.
Q8Written answer
What is the function of leghaemoglobin in the root nodule of a legume?
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Leghaemoglobin is a red coloured pigment present in the root nodules of a legume. It is also considered as oxygen molecule scavenger
Q9Written answer
What is common to Nepenthes, Utricularia and Drosera with regard to the mode of nutrition?
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These plants trap insects and feed on them to get nutrition.
Q10Written answer
Plants with zinc deficiency show reduced biosynthesis of _______________.
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Plants with zinc deficiency show reduced biosynthesis of Auxin (IAA).