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They react with hydrogen to form hydrides. Movement of various types can be taken as an indication of life. The maintenance of life requires processes like nutrition, respiration, transport of materials within the body and excretion of waste products. Autotrophic nutrition involves the intake of simple inorganic materials from the environment and using an external energy source like the Sun to synthesise complex high-energy organic material.
Heterotrophic nutrition involves the intake of complex material prepared by other organisms. In human beings, the food eaten is broken down by various steps along the alimentary canal and the digested food is absorbed in the small intestine to be sent to all cells in the body. During the process of respiration, complex organic compounds such as glucose are broken down to provide energy in the form of ATP. ATP is used to provide energy for other reactions in the cell.
Respiration may be aerobic or anaerobic. Aerobic respiration makes more energy available to the organism. In human beings, the transport of Class 10th Ncert Exemplar Science Version materials such as oxygen, carbon dioxide, food and excretory products is a function of the circulatory system. The circulatory system consists of the heart, blood and blood vessels. In highly differentiated plants, transport of water, minerals, food and other materials is a function of the vascular tissue which consists of xylem and phloem.
In human beings, excretory products in the form of soluble nitrogen compounds are removed by the nephrons in the kidneys. Plants use a variety of techniques to get rid of waste material. For example, waste material may be stored in the cell-vacuoles or as gum and resin, removed in the falling leaves, or excreted into the surrounding soil. Control and coordination are the functions of the nervous system and hormones in our bodies.
The responses of the nervous system can be classified as reflex action, voluntary action or involuntary action. The nervous system uses electrical impulses to transmit messages. The nervous system gets information from our sense organs and acts through our muscles. Chemical coordination is seen in both plants and animals. Hormones produced in one part of an organism move to another part to achieve the desired effect. A feedback mechanism regulates the action of the hormones.
A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons. The SI unit of electric current is ampere. To set the electrons in motion in an electric circuit, we use a cell or a battery. A cell generates a potential difference across its terminals. It is measured in volts V. Resistance is a property that resists the flow of electrons in a conductor.
It controls the magnitude of the current. The resistance of a conductor depends directly on its length, inversely on its area of cross-section, and also on the material of the conductor. The equivalent resistance of several resistors in series is equal to the sum of their individual resistances. One watt of power is consumed when 1 A of current flows at a potential difference of 1 V.
The commercial unit of electrical energy is kilowatt hour kWh. A compass needle is a small Class 10th Ncert Exemplar Science Group magnet. Its one end, which points towards north, is called a north pole, and the other end, which points towards south, is called a south pole. A magnetic field exists in the region surrounding a magnet, in which the force of the magnet can be detected. Field lines are used to represent a magnetic field. A field line is the path along which a hypothetical free north pole would tend to move.
The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take. Field lines are shown closer together where the magnetic field is greater. A metallic wire carrying an electric current has associated with it a magnetic field.
The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor. The magnetic field of a solenoid carrying a current is similar to that of a bar magnet. An electromagnet consists of a core of soft iron wrapped around with a coil of insulated copper wire.
A current-carrying conductor when placed in a magnetic field experiences a force. This is the basis of an electric motor. An electric motor is a device that converts electric energy into mechanical energy. The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time.
The magnetic field may change due to a relative motion between the coil and a magnet placed near to the coil. If the coil is placed near to a current-carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor. A generator converts mechanical energy into electrical energy. It works on the basis of electromagnetic induction.
In our houses we receive AC electric power of V with a frequency of 50 Hz. One of the wires in this supply is with red insulation, called live wire. The other one is of black insulation, which is a neutral wire. The potential difference between the two is V. The third is the earth wire that has green insulation and this is connected to a metallic body deep inside earth. Science Exemplar contains various types of questions. These types of questions help students to understand complicated concepts and improve their problem-solving skills.
This book has logical questions, by solving which you can give your best performance in the competitive exam with complete confidence. With the help of this book, the performance of your exam will improve surely. As a result, the students will be able to face the final exam. Each topic within this book is subtly explained. The formulas in the book will help you with your competitive exams. This book will help you solve your questions at a faster pace and help you sit in your exam with confidence.
Solving such problems will increase the logical and thinking power of the student. So that there is no doubt that will remain in the minds of the students about the questions.
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