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class 10 chapter 8 of science...

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NCERT Class 10 Chapter 8 How do Organisms Reproduce? ( All intext and Exercise Questions Solved) Questions Page no: 128 1. What is the importance of DNA copying in reproduction? Solution: DNA – Deoxyribonucleic acid is the genetic material that is present in the cells of all organisms. DNA carries genetic information from one generation to the other and this helps in producing organisms of its own types. DNA copying is a must for inheriting the traits from parents. Any variations in DNA copying will give rise to origin of new species. 2. Why is the variation beneficial to the species but not necessarily for the individual? Solution: The reason why the variation is beneficial to the species than individuals is because sometimes the climatic changes have a drastic effect on the species, which makes their survival difficult. For examples, if the temperature of the water body increases, then there might be certain species of microorganisms which might die. This may result in disturbance in...
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class 10 ch 7 of science

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Very helpful blog..... Class 10 Science Chapter 7: Control and Coordination Questions Page number   119 1. What is the difference between a reflex action and walking? Solution: Reflex action are the involuntary actions that occur in response to stimuli. They occur without involvement of conscious areas of brain. All the reflex actions are unconscious actions. Reflex action occurs brain and spinal cord of central nervous systems. On the other hand voluntary actions are those which occur under the control of cerebellum of the brain Walking is learnt as we grow. Walking is controlled by brain as is used when required. 2. What happens at the synapse between two neurons? Solution: Between the synapse between two neurons electric signals are converted into chemicals that can easily cross over the gap and pass on the chemical messenger to next neuron where it is converted back to electrical signal. 3. Which part of the brain maintains posture and equilibrium of the body? Solution: Cerebel...
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class 10 the life process......

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Class 10 chapter life process .... Introduction Life Earth happens to be the only known planet having a life. There are beings who live, die and become part of nature again. The living organism can be differentiated from the inanimate entities on various parameters of life processes. Life Process Maintenance of living organism is essential even if they are moving, resting or even sleeping. The processes which together perform the function of maintenance of ‘life’ are called as life processes. Nutrition, respiration, circulation, excretion are examples of essential life processes. In unicellular organisms, all these processes are carried out by that single cell. In multicellular organisms, well-developed systems are present to carry out the processes. Nutrition Nutrition The process of acquiring food that is needed for nourishment and sustenance of the organism is called nutrition. There are two main modes of nutrition, autotrophic and heterotrophic. Heterotrophic nutrition has subtypes...
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