(a) Explain the following modes of nutrition which occur in plants:
(i)Autotrophic
(ii) Chemosynthetic
(iii) Carnivorous
(b) Give one example each of a plant which undergoes the modes of nutrition listed in (a) above.
(c) (i) Describe three ways by which nitrogen is added to the soil for plant use.
(ii) State two ways by which nitrogen is lost from the soil.
(a) Modes of nutrition in plants: Autotrophic: Plants manufacture their food; using water from the soil; and carbon dioxide from the atmosphere in the presence of sunlight.
Chemosynthetic: These plants manufacture their food; using atmospheric carbon dioxide; and energy from the breakdown of inorganic compounds.
Carnivorous: These plants in addition to photosynthesizing have special devices; for trapping and digesting insects and other small organism; to balance a deficiency in nitrogen.
(b)(i) Autotrophic: Flowering plant
(ii) Chemosynthetic: Nitorsomonas, Nitrobacter, fungi, Nitrococcus.
(iii) carnivorous: Pitcher plants, bladderwort; sundew, venus flytrap, butterwort.
(c)(i) Addition of nitrogen to soil. Decomposition of dead organic matter:
(ii) Loss of nitrogen from the soil: -
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