Unit 15 Growth And Development In Plants Flashcards
Plants only grow when
Their cells are turgid after absorbing water
Plants require oxygen for
Respiration and growth
Plants manufacture all essential organic constituents from
Carbon dioxide, water and inorganic salts
Optimum growth temperature for winter wheat of cool temperate regions is
20-25°C
Optimum temperature for maize in tropical regions is
30-35°C
Chlorosis and stunted growth is due to deficiency of
Nitrogen
Nitrogen is absorbed from the soil as
Nitrate or ammonium salts
Phosphorus is absorbed from the soil as
H2PO4, Orthophosphate
Orthophosphate is a constituent of
Nucleoproteins and phospholipids
Deficiency of phosphorus leads to
Stunted plants and dull dark green colouration of leaves
Phosphorus is involved in energy transfer in plants.
Potassium is absorbed from the soil as
Salts K2
Formation of yellow leaves and premature death of plants is a sign of
Potassium deficiency
Which mineral nutrient is involved in activation of several enzymes and does not occur in organic forms
Potassium
Sulphur is absorbed from the soil as
Sulphate SO4
Deficiency of sulphur leads to
Chlorosis
Sulphur is a constituent of
Some amino acids eg cysteine and cysteine
Thiamine and Enzyme A
Calcium is absorbed from the soil as
Calcium salts Ca2+
Calcium occur in considerable quantities in cells as
Calcium pectate
Calcium deficiency results in
Stunting of roots and stem
It activates several enzymes
Magnesium is absorbed from the soil as
Magnesium salts
A constituent of chlorophyll molecule that also affects activities of several enzymes is
Magnesium
Deficiency of magnesium leads to
Purple coloration of leaves in some plants or chlorosis even though veins of leaves may remain green
Iron is absorbed from the soil as
Iron salts Fe2+
What nutrient is involved in synthesis of chloroplast proteins
Iron
