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acid agricultural anaerobic respiration attack bacteria bacterium Botany British cambium carbon dioxide cell wall cellulose CHAPTER characters chemical elements chlorophyll chromosome number coloured containing countries crop plants daughter cells economic energy enzyme factors farmer fertilisers flower formation fruit Fungi fungus garden genes germ grain grass growing point growth healthy plant hormone horticultural important increase insect introduction known land leaf pores leaves light lignin living plant Long Day Plants Lysenko manure material method microscope mycorrhiza nitrogen normal nucleus number of chromosomes offspring organs oxygen parasites parent passed pests plant breeding plant cells polyploidy possible Potato production protein protoplasm reproduce respiration result roots Russian Rust scientific seed seedlings short day plants short plants soil species sperms spores starch stem substances sugar supply temperature theory thermo-stage threads tion tissues tomatoes varieties various vegetation vernalisation virus virus agent virus diseases vitamin weeds wheat