Ahs2305:Plant Nutrition Question Paper
Ahs2305:Plant Nutrition
Course:Bachelor Of Horticulture
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE (30 MARKS)
a) Describe the form in which the following nutrients elements are available to plant. i. Carbon ii. Hydrogen iii. Phosphorous iv. Potassium ( 5 Marks) b) Explain the most recognized functions of nitrogen (N), phosphorus (p) and potassium (K) in plant. (10 Marks) c) Explain what is an essential element and highlight four (4) criteria used for essential elements. (6 Marks) d) Distinguish between macro-nutrient and micro-nutrients (4 Marks) e) Explain the soil factors that influence nutrients uptake. ( 5 Marks)
QUESTION TWO (20 MARKS)
a) Explain how the processes of mass flow, diffusion and root interception affect nutrient uptake. ( 10 Marks) b) Explain how nitrogen is lost in the soil. (10 Marks)
QUESTION THREE ( 20 MARKS)
Using an illustration, explain how the following terms relate to plant nutrients level in a plant;
i. Critical value ii. Sufficiency range iii. Luxury consumption iv. Toxicity level v. Hidden hunger
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QUESTION FOUR ( 20 MARKS)
a) Explain six factors that should be considered when using plant tissue for nutrient analysis. (10 Marks) b) Explain how you estimate the total nitrogen present in a particular sample using kjeldahl method. ( 10 Marks)
QUESTION FIVE ( 20 MARKS)
a) Explain the role of the following in supplying nutrients from the soil; i. Soil solution ii. Cation exchange sites iii. Organic matter iv. Soil minerals v. Plant residue (10 Marks) b) Explain the following nutrient transformation and interaction; i. Mineralization ii. Immobilization iii. Nutrient uptake antagonism ( 10 Marks)
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