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Q10(d):
Which of the following statements are true? If false, correct them: (d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.
Solution :
1. Evaluation of the Statement
The statement "It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities" is False.
2. Justification and Correction
Correction: It is exceptionally difficult to establish the essentiality of micronutrients precisely because they are required in trace quantities; achieving the high level of purity in experimental culture media required to create a "deficiency" is technically arduous.
3. Analytical Breakdown of Essentiality Criteria
To classify an element as "essential," specific criteria (as defined by Arnon and Stout, 1939) must be met:
- The plant must be unable to complete its life cycle (growth or reproduction) in the absence of the element. [Per Criterion of Essentiality]
- The element must be specific and cannot be replaced by another element. [Per Specificity Principle]
- The element must be directly involved in the metabolism of the plant. [Per Metabolic Involvement Principle]
4. The Challenge of Trace Quantities
The technical difficulty arises from the following physical and chemical factors:
| Factor | Impact on Experimental Design |
|---|---|
| Contamination | Even laboratory-grade reagents often contain trace impurities of micronutrients, making it difficult to create a truly "deficient" environment. [By Law of Minimums/Contamination Interference] |
| Detection Limits | The levels required (often $\leq 10\ mmol\ kg^{-1}$ of dry matter) are near the limits of detection for many analytical instruments. [Per Analytical Sensitivity Requirements] |
| Systemic Recycling | Plants may mobilize trace elements from seed reserves, masking the symptoms of deficiency in the initial growth phases. [Per Nutrient Allocation Theory] |
5. Visual Representation of Experimental Constraints
6. Summary of Scientific Reasoning
Because micronutrients are needed in minuscule amounts, the standard methods for establishing essentiality (such as hydroponics or sand culture) require extreme precautions to avoid unintended supplementation via water, dust, or container materials. Failure to remove these "background" trace elements leads to false negatives, where the plant grows despite the intended exclusion of the nutrient. Thus, proving essentiality requires highly sophisticated, ultra-pure biochemical environments that are far from "easy" to maintain.
Final Solution: The statement is False. The requirement of trace quantities makes the experimental isolation of these elements extremely difficult due to the high probability of unintentional contamination in the nutrient medium.
More Questions from Class 11 Biology Mineral Nutrition EXERCISES
- Q1: ‘All elements that are present in a plant need not be essential to its survival’. Comment.
- Q2: Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?
- Q3: Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements.
- Q4: Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.
- Q5: If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?
- Q6: Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?
- Q7: How are the minerals absorbed by the plants?
- Q8: What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in $N_2$-fixation?
- Q9: What are the steps involved in formation of a root nodule?
- Q10(a): Which of the following statements are true? If false, correct them: (a) Boron deficiency leads to stout axis.
- Q10(b): Which of the following statements are true? If false, correct them: (b) Every mineral element that is present in a cell is needed by the cell.
- Q10(c): Which of the following statements are true? If false, correct them: (c) Nitrogen as a nutrient element, is highly immobile in the plants.
CBSE Solutions for Class 11 Biology Mineral Nutrition
Chapters in CBSE - Class 11 Biology
- The Living World
- Biological Classification
- Plant Kingdom
- Animal Kingdom
- Morphology of Flowering Plants
- Anatomy of Flowering Plants
- Structural Organisation in Animals
- Cell – The Unit of Life
- Biomolecules
- Cell Cycle and Division
- Transport in Plants
- Photosynthesis
- Respiration in Plants
- Plant Growth and Development
- Digestion and Absorption
- Breathing and Exchange of Gases
- Body Fluids and Circulation
- Excretory Products and Elimination
- Locomotion and Movement
- Neural Control and Coordination
- Chemical Coordination and Integration
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