Skip to main content

Mineral nutrition concept 12


01
 
DEFINITION
Types of minerals on the basis of essentiality
  • The minerals are of two types, essential and non-essential.
  • Only about 17-20 elements are found to be essential. The rest elements are called non-essential without which a plant can survive and reproduce. 
  • The non-essential elements may be beneficial or toxic.
  • The essential elements are differentiated into two categories, macroelements and microelements.
02
 
DEFINITION
Macronutrients
  • Nutrients which are required in large quantities are called as macronutrients. 
  • Primary (macro) nutrients are nitrogen, phosphorus and potassium. They are the most frequently required in a crop fertilization program. Also, they are need in the greatest total quantity by plants as fertilizer.
03
 
DEFINITION
Micronutrients
  • Nutrient which are required in small quantities are called as micronutrients. 
  • The micronutrients are boron, chlorine, copper, iron, manganese, molybdenum and zinc. 
  • These plant food elements are used in very small amounts, but
    they are just as important to plant development and profitable crop production as the major nutrients. 
04
 
DEFINITION
Toxicity of micronutrients
  • In higher doses, micronutrients become toxic.
  • Any tissue concentration which reduces dry weight of tissue by 10% is called toxic concentration.
05
 
DEFINITION
Soil as reservoir of essential elements
  • Soils are derived from rock by processes of weathering.
  • Bulk of materials that are essential for the growth and development of plant become available to roots due to weathering and breakdown of rocks.
  • These processes augment the soil with dissolved ions and inorganic salts.
  • Soil not only supplies minerals but also harbours nitrogen fixing bacteria, other microbes, hold water, supplies air to the roots and acts as matrix that stabilizes the plant.
06
 
DEFINITION
Nitrogen-fixing bacteria
  • Nitrogen-fixing bacteria are microorganisms present in the soil (Rhizobium) or in plant roots that change nitrogen gases from the atmosphere into solid nitrogen compounds that plants can use in the soil.
07
 
DEFINITION
Root nodules in leguminous plants
  • Root nodules occur on the roots of plants that associate with symbiotic nitrogen-fixing bacteria. 
  • Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia.
08
 
DEFINITION
Hydroponics
  • Solution culture is being used for raising flowers and vegetables at home. This soilless production of plants is known as hydroponics.

Comments

Post a Comment

Popular posts from this blog

Respiration in plants concept 14

01   DEFINITION Cellular respiration Cellular respiration is the exchange of gases (oxygen and carbon dioxide) between blood and cells or within the cell. It is the biochemical pathway to release energy. 02   DEFINITION Respiration and burning Respiration is also called as a process to burn nuteirnts in the presence of oxygen to produce energy. But still different from burning. The difference are as follows: Respiration Burning/combustion 1. It occurs in series of chemical steps i.e., stepped process. It occurs in a single step. 2. It is carried out by enzymes. It is carried out by heat. 3. It is a biochemical process. It is a physiochemical process. 4. Energy is liberated as ATP and heat. Energy is liberated as heat and light. 5. No light energy is produced. Light energy is produced. 6. It takes place inside a cell. It does not takes place inside a cell. 7. It occurs at body temperature. It occurs at high temperature. 03  ...
Post a Comment
Read more

Chemical coordination and integration contact 22

01   DEFINITION Diagrammatic representation of hormones produced in Human body Diagrammatic representation of the various endocrine hormones produced by the glands and tissues in a human body. 02   DEFINITION Endocrine glands Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.  The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands. 03   DEFINITION Hormones from anterior pituitary gland Hormones from anterior pituitary gland are as follows: Growth hormones: Promote growth of whole body, particularly of the skeleton. Thyroid stimulating hormone: Stimulates thyroid to secrete thyroxine. Adrenocorticotropic hormone: Stimulate adrenal cortex. Gonadotrophic hormone: Regulates the activity of gonads...
Post a Comment
Read more

NCERT solution

(1) Identify the correct sequence of taxonomical categories? (a) Species - Order - Phylum - Kingdom (b) Genus - Species - Order - Kingdom (c) Species - Genus - Order- Phylum SOLUTION (a) and (c) represent correct sequences of taxonomic categories as the correct hierarchical arrangement of taxonomic categories in ascending order is Species → Genus → Family → Order → Class → Phylum → Kingdom In sequence (b), species should have been followed by genus. Therefore, it does not represent the correct sequence.                               Concept 01   DEFINITION Hierarchical of classification groups Carolus von Linnaeus created a hierarchical classification system using seven taxonomic categories. Kingdom - Top most taxonomic category. Phylum - Term used for animals while its synonym division is used for plants. Class - One or more than one order makes a cl...
Post a Comment
Read more