Nutrition In Plants – Mineral Nutrition — Flashcards
NIOS · Class 12 · Biology
30 flashcards for Nutrition In Plants – Mineral Nutrition (NIOS Class 12 Biology) to test yourself on key terms and facts.
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What is mineral nutrition in plants?
Answer
Mineral nutrition is the study of how plants obtain mineral elements from soil and utilize them for their growth and development. Minerals are absorbed by the root system in the form of salts and ioni…
Define autotrophic and heterotrophic nutrition in plants.
Answer
Autotrophic nutrition: Plants (like green plants) manufacture their own organic food from simple inorganic raw materials (CO₂ and H₂O) using sunlight energy through photosynthesis. They are called pho…
What is hydroponics and why is it important in studying mineral nutrition?
Answer
Hydroponics is a technique of growing plants in nutrient solution without soil, developed by Julius Von Sachs in 1980. Plants are grown in water containing known minerals in specific proportions, with…
How does aeroponics differ from hydroponics?
Answer
Aeroponics is a technique growing plants in an air/mist environment without soil, whereas hydroponics uses nutrient solution. Key differences: In aeroponics, roots are in a specially designed box with…
State the four criteria used to determine if an element is essential for plants.
Answer
The four criteria for essentiality of an element are: (1) The element is absolutely necessary for normal growth and reproduction, and is part of essential metabolites for plant growth, (2) Its require…
What are macronutrients and micronutrients? List examples of each.
Answer
Macronutrients (Macro-elements): Required in relatively large quantities (1-10 mg per gram of dry plant matter). Examples: Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), Phosphorus (P), Potassium…
Where do plants obtain carbon, oxygen, and hydrogen?
Answer
Carbon: Obtained as CO₂ from the atmosphere (air). Plants absorb CO₂ through stomata in leaves, and it is used in photosynthesis to synthesize carbohydrates. Oxygen: Absorbed in molecular form (O₂) fr…
How is nitrogen obtained by plants, and why is it essential?
Answer
Nitrogen uptake: Plants absorb nitrogen from soil in two ionic forms—nitrate ions (NO₃⁻) and ammonium ions (NH₄⁺). Some organisms like nitrogen-fixing bacteria and cyanobacteria can fix nitrogen direc…
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