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Plant Water Relation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Water Relation5 Marks
Question
Write a note on macronutrients and micronutrients required for plant growth.
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Answer

$1.$ Plants absorb mincral nutrients from their surroundings.
$2.$ For a proper growth of plants about $35$ to $40$ different elements are required.
$3.$ Plants absorb these nutrients in ionic or dissolved form from soil with their root system e.g. Phosphorus as $PO_4^–.$ Sulphur as $SO_4^{2-}$ etc.
$4.$ Based on their requirement in quantity. they are classified as major nutrients or macronutrients and those needed In small amounts are minor or micronutrients.
$5.$ Macroclements are required in large amounts, as they play nutritive and structural roles e.g. $C, H, O, R, Mg, N, K. S$ and $Ca. -Ca$ pectate cell wall component. Mg component of chlorophyll.
$6. \ C. H, O$ are non$-$mineral major elements obtained from air and water e.g. $CO_2$ is source of carbon, Hydrogen from water.
$7.$ Microelements arc required In traces as they mainly have catalytic role as co$-$factors or activators of enzymes.
$8.$ Microelernents may be needed for certain activity in life cycle of plant e.g. $B$ for pollen germination, Si has protective role during stress conditions and fungal attacks, $Al$ enhances availability of phosphorus.
$9.$ The Important micronutrients for plant growth are $Mn. B. Cu, Zn, Cl.$

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