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precautions to prevent from hiv to avoid hiv infection one should practice safe sex use of condoms besides a few simple precautions are given
protraction from hiv under the following conditions hiv is not transmitted1 the secretions and body fluids like saliva tears sweat faeces and
formation of female gametesovule develops from a cushion like part of the ovary called the placenta ovule is connected to the placenta by a stalk
uses of graftinggrafting helps to preserve and perpetuate varieties that cannot reproduce by vegetative methodgrafting changes less useful
advantages of vegetative propagationvegetative propagation helps to maintain fixed qualities and characteristic features of the parent plantfor
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
thermodynamics and energy 2 types of energy kinetic and potential work is the transfer of energy from one place to another energy isnt lost only
biological catalysts agrave speed up chemical reactions in the body without being consumed in the process reduce the activation energy needed
diesel-like liquid obtained from materials of biological origin is called biodiesel biodiesel can be obtained i either from lipids accumulated plants
xenobiotic compounds are man-made chemicals that are present in the environment at unnaturally high concentrations the xenobiotic compounds are
use of micro-organisms to control insect pests pathogens or weeds constitutes biological control and the biological agents employed are called
plants are the source of a large variety of biochemicals which are metabolites of both primary and secondary metabolism but secondary metabolites
amino acid - compound with an amino group and a carboxyl group attached to a central carbon proteins make up 50 of dry mass of cells in our
carbohydrate - contains carbon hydrogen and oxygen with a general formula of cxh2oy simple sugars agrave monosaccharides oligosaccharide agrave