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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
Explain the various conditions of growth that are essential.
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Answer

  1. For a proper growth of plant various environmental and physiological conditions are necessary.
  2. Carbon/Nitrogen ratio in soil is having effect on growth as both carbon and nitrogen are structural elements in carbohydrates, proteins and other biomolecules.
  3. Water is essential component of protoplasm and required for turgidity of cells during cell enlargement phase. It is a medium in which various biochemical reactions ocfcur.
  4. Nutrients are necessary for proper growth. Macronutrients and micronutrients have their specific role.
  5. Temperature of 25 – 35 °C is optimum for growth.
  6. Light is essential for seed germination and photosynthesis.
  7. Oxygen is necessary for respiration and supply of energy.
  8. Gravitational force decides direction of growth for root system and shoot system.
  9. Growth hormones are organic compounds that are involved in various physiological aspects and control of growth.

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