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Biology Exemplar
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Chapter 1: The Living World
37 questions
2
Chapter 2: Biological Classification
33 questions
3
Chapter 3: Plant Kingdom
28 questions
4
Chapter 4: Animal Kingdom
45 questions
5
Chapter 5: Morphology of Flowering Plants
42 questions
6
Chapter 6: Anatomy of Flowering Plants
52 questions
7
Chapter 7: Structural Organization in Animals
48 questions
8
Chapter 8: Cell: The Unit of Life
39 questions
9
Chapter 9: Biomolecules
31 questions
10
Chapter 10: Cell Cycle and Cell Division
43 questions
11
Chapter 11: Transport in Plants
66 questions
12
Chapter 12: Mineral Nutrition
39 questions
Q1
We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia another microbe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus. (a) Can we artificially induce the property of nitrogen-fixation in a plant, leguminous or non-leguminous?
(b) What kind of relationship is observed between mycorrhiza and pine trees?
(c) Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
(b) What kind of relationship is observed between mycorrhiza and pine trees?
(c) Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
Q2
What are essential elements for plants? Give the criteria of essentiality? How are minerals classifieds depending upon the amount in which they are needed by the plants?
Q3
With the help of examples describe the classification of essential elements based on the function they perform.
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Chapter 13: Photosynthesis in Higher Plants
59 questions
14
Chapter 14: Respiration in Plants
42 questions
15
Chapter 15: Plant Growth and Development
48 questions
16
Chapter 16: Digestion and Absorption
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17
Chapter 17: Breathing and Exchange of Gases
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Chapter 18: Body Fluids and Circulation
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Chapter 19: Excretory Products and their Elimination
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Chapter 20: Locomotion and Movement
39 questions
21
Chapter 21: Neural Control and Coordination
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Chapter 22: Chemical Coordination and Integration
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Question
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Solving time: 2 mins
What are essential elements for plants? Give the criteria of essentiality? How are minerals classifieds depending upon the amount in which they are needed by the plants?
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An element is essential to plants if it is necessary for supporting its normal growth and reproduction. The requirement of this element must be specific and is not replaceable by any another element in the soil. They must be directly involved in the metabolism of the plant.
Criteria for Essentiality:
An element can not be considered as essential merely on the basis of its presence in the plant. It is considered essential on the basis of the following criteria.
(i) The plant is unable to grow normally and complete its life cycle in the absence of the element.
(ii) The element is specific and can not be replaced by another element.
(iii) The element plays a direct role in the metabolism of the plants.
The essential elements are further classified into two categories:
(a) Macroelements: These are the elements required by plants in larger quantities. These are C, H, O, N, P, K, Mg, Ca and S.
(b) Microelements (Trace elements): These are required by plants in low quantities (often less than 1 ppm). These include B, Zn, Mn, Cu, Mo, Cl, Fe and Ni.
Criteria for Essentiality:
An element can not be considered as essential merely on the basis of its presence in the plant. It is considered essential on the basis of the following criteria.
(i) The plant is unable to grow normally and complete its life cycle in the absence of the element.
(ii) The element is specific and can not be replaced by another element.
(iii) The element plays a direct role in the metabolism of the plants.
The essential elements are further classified into two categories:
(a) Macroelements: These are the elements required by plants in larger quantities. These are C, H, O, N, P, K, Mg, Ca and S.
(b) Microelements (Trace elements): These are required by plants in low quantities (often less than 1 ppm). These include B, Zn, Mn, Cu, Mo, Cl, Fe and Ni.
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Practice more questions from Biology Exemplar (NCERT Exemplar)
Q1
We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia another microbe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus. (a) Can we artificially induce the property of nitrogen-fixation in a plant, leguminous or non-leguminous?
(b) What kind of relationship is observed between mycorrhiza and pine trees?
(c) Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
(b) What kind of relationship is observed between mycorrhiza and pine trees?
(c) Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
Q2
What are essential elements for plants? Give the criteria of essentiality? How are minerals classifieds depending upon the amount in which they are needed by the plants?
Q3
With the help of examples describe the classification of essential elements based on the function they perform.
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(2) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
(3) Stamens in flowers of and are polyandrous.
(4) Symbiotic nitrogen-fixers occur in free-living state also in soil.
How many of the above statements are correct?
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| Question Text | What are essential elements for plants? Give the criteria of essentiality? How are minerals classifieds depending upon the amount in which they are needed by the plants? |
| Topic | Mineral Nutrition |
| Subject | Biology |
| Class | Class 11 |
| Answer Type | Text solution:1 |
| Upvotes | 124 |
