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importance of reproductionreproduction is an important life process in animals and plantsreproduction is the ability of an organism to produce new
spinal nervesthey take their origin from the spinal cordthey are the mixed nerves having both sensory and motor fibres there are 31 pairs of
craninal nervescranial nerves take their origin from different areas of brain some of them are sensory some are motor and a few are mixed
spinal cordspinal cord is a long and cylindrical structureit passes through the vertebral column extending all along the dorsal surface
functions of cerebrumthe forebrain is otherwise called as lsquocerebrumit is highest centre for controlling several functions in the bodythe most
motor nerves nerves which carry impulses from brain or spinal cord to effector organs are called efferent or motor nerves stimulation of motor
hormones secreted by gonads1 testis and ovary are called gonads in the human body2 apart from producing gametes gonads also secrete hormonestestis
importance of pituitary glandpitutary gland is very small and it is about the size of a large pea seedit is very important as it controls the
endocrine glandsendocrine glands have no ducts - so these are also called as ductless glands egpituitary etcthese glands secrete chemical
gibberellins in plant growth gibberellins were first isolated from the culture of a fungus gibberella fujikuorigibberellins has a significant
auxinsauxins are plant growth substances the term auxin usually refers to a chemical compound called indole acetic acid iaa which is the major
growth and development of multi cellular organismsthe normal growth and development in all multicellular organisms occur in a programmed mannerthe
refining of petroleumpetroleum crude extracted from earths crust is an intimate mixture of many organic compounds crude petroleum needs to be
manufacture of cementcement is a composite mixture of calcium silicates amp calcium aluminates which is a popular material used for construction1
factors that effect the solubility of a solute the solubility of a solute is effected by three factors like1 nature of solute2 nature of solvent3
population inversionthe process in which the number of electrons n2 in a higher energy state called lsquometastable state of an active medium is
phenomenon of interference of water waves1 arrange two identical adjacent pins s1 and s2 vibrating in a ripple tank with the same frequency2 in
ripple tankthe concept of reflection and refraction of light waves can be understood by the study of reflection and refraction of waves on water
huygens wave theoryhuygens wave theory is not correct in all respects2 it assumes simply that light energy is propagated as a wave3 at the time of
concept of wave front the basis of huygens wave theory of light is his principle concerning construction of wave frontwhen a disturbance from
microprocessor a combination of ics cal led a microprocessor the data is processed in the microprocessor according to the instructions given
detection receiver the antenna receiver these modulated waves from different transmitting stationschannel selector selects the desired signals the
the amplified video signals are amplitude modulated using a suitable rf carrier wave in a transmitter called lsquoam picture transmitter similarly
production of audio and video signalsiconoscope is a type of camera consisting of a cathode ray beam and a photoelectric cell the picture is
majority and minority charge carriers a pure semiconductor has equal number of holes and electrons but an extrinsic semiconductor has majority