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Notes on "Natural Resources" by Nagraj Sir

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 Notes on "Natural Resources" by Nagraj Sir Natural Resources The resources available on the earth and the energy from the sun are necessary to meet the basic requirements of all life forms on the earth. The stocks of nature which are useful to mankind are known as natural resources. Examples: air, water, soil, minerals etc.  Resources on the earth → The outermost crust of the earth is called the  lithosphere . → Water covers 75% of the earth’s surface. It is also found underground. These comprise the  hydrosphere . → The air that covers the whole of the earth like blanket is called the   atmosphere . Biosphere → All living things on earth together with atmosphere, the hydrosphere and the lithosphere interact and make life possible is known as  biosphere . • It may be: (i) Biotic components: Plants and animals. (ii) Abiotic components: Air, water and soil. Air:  It is a mixture of many gases like oxygen, nitrogen, carbon-dioxide, water vapour and other...
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Notes on Improvement in Food Resources by Nagraj Sir

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Notes on Improvement in Food Resources by Nagraj Sir Introduction All living organisms essentially require the food to stay alive. Food provides energy to perform various life activities and is required for growth, development and body repair. Sources of Food : 1. Food from agriculture: Cereals, pulses, vegetables, fruits, nuts, oilseeds, condiments and spices 2. Food from animal husbandry: Dairly products like milk, curd, butter; meat, egg, fish and other sea products.   Kharif crops : The crops grown in rainy season are called as Kharif crops (Paddy, Soya bean, pigeon pea and maize). They are grown from June to October. Rabi crops : The crops grown in winter season are called  Rabi crops  (Wheat, gram, peas, and mustard). They are grown November to April. Food Revolutions in India With the increase in population, there needed a sufficient increase in food production, so as to meet the food related demands of growing population. This led to the rise...
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"Tissues" PART-1 (Plant Tissues)

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TISSUES PART 1 (PLANTS TISSUES) Notes by:- Nagraj Sir Tissue :   A group of cells, that are similar in structure and work together to achieve a particular function, forms a tissue. they are two types 1-meristematic 2-Permanent Meristematic tissue :   Meristematic tissues are the tissues which have the ability to grow by rapid division.  They help in the primary growth of the plant. These cells are closely packed with no intercellular spaces. they are 3 types 1-APICAL 2-LATERAL 3- INTERCALARY     •  Apical meristem is present at the apical or growing tips of stems and roots.  Apical meristem increases the length of the plant.     •  Lateral meristem is present in the radial portion of the stem or root.  Lateral meristem increases the girth of the plant.     •  Intercalary meristem occurs at the base of the leaves or at the internodes.  Intercalary meristem increases the length of ...
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ALL DIAGRAM OF CHAPTER TISSUES by Nagraj Sir

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ALL DIAGRAM OF CHAPTER TISSUES by:- Nagraj Sir Plant Tissues A.Meristematic tissues apical , lateral , intercalary B.permanent tissues 1 simple parenchyma 2.collenchyma 3.sclerenchyma C.complex xylem and phloem Animal tissues A.epithelium 1.squamous 2.cuboidal 3.columnar. 4.ciliated 5.glandular B.muscular tissues C.connective tissues 1.areolar 2.adipose 3.skeletal 4.dense regular connective tissues tendon and ligament fluid tissue blood and lymph D.Nervous tissues
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