Biotechnology : It is an important branch of biology which makes use of the knowledge of biochemistry, molecular biology, microbiology, and genetic engineering for the benefit of the mankind.The word, Biotechnology, was used for the first time in the Leeds Council in United Nations in 1920.The results of biotechnology were used for the first time […]
What makes the movement of plants is discussed in this chapter.Conditions necessary for Plant Movements1. Water : Proper water supply is essential for certain kind of movements.2. Temperature : Movement of plants can take place within a certain range of temperature only.3. Oxygen : The energy produced during respiration due to oxygen, makes the plants
Growth : Growth may be defined as a vital irreversible process which brings about a permanent change in any plant in respect of its size, form, weight and volume.Cellular growth has three main aspects as phases of growth. These are—(i) Cell division : It is the first step of growth of a plant and carries
Significance of Photosynthesis : It is a physico-bio chemical process of the world which is responsible for existence of life on the earth.Photosynthesis : Plants with chlorophyll convert the solar energy into chemical energy. Plants synthesise carbohydrates using raw materials got from the surroundings. They store that chemical in the form of potential energy in
Catalysis : Some chemicals alter the rate of chemical reaction without undergoing any change, usually hasten the rate of reaction, such substances are known as catalysts and the phenomenon is known as catalysis.Enzymes : We may call enzymes as organic catalysts. Enzymes increase the rate and efficiency of biochemical reactions in cells.Simple Enzyme : Enzymes
Fertilizers are those chemicals which improve the fertility of the soil and increase crop productivity. Chemical fertilizers played an important role in ‘Green Revolution’ in multiplying crop productivity to several times. Large scale use of chemical fertilizers has resulted into several evil effects such as the loss of soil fertility, environmental pollution, and persistence of
Respiration is the process of oxidative breakdown of organic materials with the release of energy and change of Potential Energy into Kinetic Energy.Respiration is a catabolic process as the breakdown of cellular substances with the liberation of energy takes place.Respiratory Substrate : Respiratory substrate is the protoplasmic materials which on oxidation liberates energy. Glucose is
Plants need both, inorganic as well as organic matter, for their nutrition. This is called mineral nutrition. They get inorganic matter from outside and organic matter they synthesize for themselves.If the elements needed by a plant are not received by it, it can not complete its life cycle. Elements help in the metabolic activity of
Water Absorption : Water is absorbed by the roots of the plant from the soil. It goes into the plant and then into and out of cells of different parts and then it goes outside the atmosphere.The absorption of water by plant is known as water uptake.Flow of WaterBulk Flow : It is defined as
Economic botany deals with the importance of botany.The primary needs of human beings are food, shelter and clothing; and all the three are supplied by plants. Different plants yield food, fibres, oil, wood, vegetables, rubber, drugs, fruits, latex, spices, beverages, gums, tannins, dyes, etc. Economically important plants can be classified into the following types—Medicinal plants
Genetics is that branch of biology which deals with heredity and variations. It tells about the inborn traits of organisms.In genetics we study—(a) Gene structure and function.(b) Production of transgenic plants and animals.(c) Production of useful proteins by new methods.Genes : Genes are present on chromosomes and are carriers of characters.Heredity : Heredity is the
Plant breading or crop improvement : Crop improvement is related with the development of improved and new crop varieties that are superior to existing ones.Objectives of crop improvement—(i) To increase the crop yield.(ii) To improve the crop quality.(iii) To develop crops which are resistant to diseases, insects, drought, frost, floods etc.(iv) To develop fast maturing
Soil : Soil is the uppermost layer of the earth’s crust in which plants grow.Pedology : The study of soil is known as Pedology or Edaphology or soil science.Formation of SoilSoil is formed from the parent rock by the process of disintegration into smaller particles. This is a slow and gradual process. This is known
Following are the communities of various plants :1. Xerophytes : The plants which grow at places where there is no normal supply of water, are called xerophytes.2. Hydrophytes : These are plants which grow in water or in wet places.3. Oxylophytes : Plants which grow on acidic soils are called oxylophytes.4. Halophytes : These are
Ecology : It is also known as environmental biology. In ecology we study plants and animals in relation to their environment. Plant ecology is concerned with the study of plants in relation to their environments.Different scientists have defined ecology as follows—Concept of Ecology Given ByHeackel (1869)—Ecology is the science of treating reciprocal relations of organisms