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Questions and Answers
What is the definition of nutrition in plants?
What is the definition of nutrition in plants?
It is the process by which an organism obtains food which is used to provide energy and materials for its life-sustaining activities.
Which modes of nutrition exist in plants?
Which modes of nutrition exist in plants?
- Parasitic (correct)
- Autotrophic (correct)
- Symbiotic (correct)
- Heterotrophic (correct)
What is plant mineral nutrition?
What is plant mineral nutrition?
It is the study of the chemical elements and compounds necessary for plant growth, metabolism, and their external supply.
How many elements are required for optimal growth and development of plants?
How many elements are required for optimal growth and development of plants?
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Define essential elements for plant growth.
Define essential elements for plant growth.
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Study Notes
Nutrition in Plants
- Definition of Nutrition: the process by which an organism obtains food to provide energy and materials for life-sustaining activities
Modes of Nutrition in Plants
- Autotrophic: organisms that can depend on themselves for building organic nutrients through photosynthesis (e.g. higher plants and algae)
- Heterotrophic: organisms that cannot depend on themselves for building organic nutrients
- Parasitic: obtain inorganic nutrients from the host plant (e.g. on stem, on root)
- Saprophytic: obtain inorganic nutrients from dead organic matter (e.g. Agaricus, Rhizopus)
- Symbiotic: mutually beneficial relationships (e.g. Micorrhiza) or obtain inorganic nutrients from insects (e.g. Insectivorous Plants, Pitcher, Dionea, Drosera)
Plant Mineral Nutrition
- Definition: the study of chemical elements and compounds necessary for plant growth, metabolism, and external supply
- Criteria for essential elements (E.Epstein, 1972):
- In its absence, the plant is unable to complete a normal life cycle
- The element is part of some essential plant constituent or metabolite
- Modified criteria (E.Epstein, 2005):
- The element is part of a molecule that is an intrinsic component of the structure or metabolism of a plant
- The plant can be severely deprived of the element, exhibiting abnormalities in growth, development, or reproduction
Essential Elements for Plant Growth
- 17 essential elements required for optimal growth and development
- Basic elements required for plant growth:
- CO2, sunlight, H2O, O2, and essential mineral nutrients
- Macronutrients: N, P, K, Ca, Mg, S, Zn, Cu, Fe, Mn, B, Mo, Cl, Ni, Co
- Inorganic components of plants: essential and non-essential elements
- Macronutrients: elements required in large quantities (>0.1% in plant body)
- Micronutrients: elements required in small quantities
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