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Plant Growth and Mineral Nutrition — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPlant Growth and Mineral Nutrition5 Marks
Question
What is hydroponics? How is it useful in identifying the role of nutrients?
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Answer

  1. Growing plants in aqueous (soilless) medium is known as hydroponics. [Greek word hudor = water and ponos = work]
  2. It is technique of growing plants by supplying all necessary nutrients in the water supply given to plant.
  3. A nutrient medium is prepared by dissolving necessary salts of micronutrients and macronutricnts In desired quantity and roots of plants are suspended in this liquid with appropriate support.
  4. Hydroponics is of great use in studying the deficiency symptoms of different mineral nutrients.
  5. The plants uptake mineral nutrients in the form of dissolved ions with the help of root hairs from the surrounding medium or nutrient solution supplied.
  6. While preparing the required nutrient medium particular nutrient can be totally avoided and then the effect of lack of that nntr’cnt can be studied in variation of plant growth.
  7. Any visible change noticed from normal structure and function of the plant is the symptom or hunger sign considered.
  8. For e.g. Yellowing of leaf is observed due to loss of chlorophyll pigments or Chlorosis is noticed if Magnesium is lacking as it is a structural component of chlorophyll pigment.

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