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177 comments:
q- what is the importance of variation in human organism?
ANSWER TO SHAKTI'S QUESTION
(A) Pre adaptation -Variation function as pre adaptation to environmental changes like increase or decrease in temperature, drought, antibiotic resistance, pesticide resistance etc. ( B) Individuality- As variation provides individuality we recognise each other. (C) Evolution-Provides raw material for evolution or formation of new species.
Q.During gamete formation 1 chromosome from each pair is taken away.Then how the original number of chromosomes are restored in the parent's body?
q-how genes control traits ?
Q1. Why are the alveoli of lungs covered with blood capillaries?
Q2.What are the two vital functions of kidney?
Q- please sent one mark question.
q please explain the mechanism of breathing as well as explain the functioning of artificial kidney ?
q-how isotope dating helps to determine the age of fossils ?
What is mutation?Why and How does it occur?What are it's good and bad effects?
What determined the racial color of the people(whites, blacks, cacusians) and what led to such a pattern of human evolution?
Which biochemical processes in our body lead to variation and evolution?
Click here for one mark questions
ANSWERS TO ABOVE QUESTIONS
1.Original numbers of chromosomes are restored during zygote formation by fertilisation process. An organism is diploid, means each cell contains 2n number of chromosomes. During gamete formation only n number chromosomes move to gamete. At the time of fertilisation when male and female gamete fuses again 2n number of chromosomes formed in zygote.
2.Genes are fragments of DNA They are expressed in the form of proteins (enzyme). They regulate a trait in terms of synthesizing protein(enzyme). For e.g. gene for growth of body synthesize protein. That protein (enzyme) if works efficiently, a lot of hormone will be made and the organism will be tall. If the gene for that enzyme has an alternation that makes that enzyme less efficient, the amount of hormone will be less, the organism will be short. Thus genes control traits.
3.Alveoli of lungs are covered with capillaries for exchange of gases by diffusion process.
4.Function of kidney- (i) filtration of nitrogenous waste from blood. (ii) osmoregulation.
5.Mechanism of breathing- it consists of two steps (i) inspiration (ii) expiration steps of inspiration-a. contraction of diaphragm b. ribs move forward and outward c. volume of thoracic cavity as well as lungs cavity increases d air pressure inside lungs decrease e. air from out side move into lungs. Steps of expiration- a. relaxation of diaphragm b. ribs move downward and inward c. volume of thoracic cavity as well as lungs cavity decreases d. air pressure inside lungs increase e. carbon dioxide rich air comes out side.
6.Functioning of artificial kidney- see page 111 of text book.
7.Isotopes are unstable atoms due to the presence of more neutrons. So the atoms undergo disintegration. The time taken for 50% disintegration of radioactive carbon present in fossil is known. Calculating the percentage of radioactive carbon in fossil scientists are able to calculate age of a fossil.
8.Mutation-It is a sudden change in chromosome structure or number and that change is heritable. Cause (i) errors in DNA copying (ii) errors during separation of chromosome (iii) some chemicals or radiations effect- the effect may be beneficial or harmful or lethal.
9.Human body colour-Several genes and environmental factors are responsible for racial human body colour.
10.Errors in DNA copying during cell division brings variation which acts as raw material for evolution.
By S.Rath PGT Biology KV III BBSR
Q-How does chemical coordination takes place in plants?
Q-What is reflex action and how it is carried out in our body?
q-How did Mendel show that traits may be dominant or reccesive?
Q-What is speciation and how does it takes place?
Q- How does homologous organs provide evidences about evolution?
Mam what is the importance of handwritting in the board exams?
I mean to say that it is quite difficult to maintain a fabolous handwritting when there is lack of time during the exams.
q-please deferentiate between analogous & homologous organisms with proper examples .
why evolution should not be equated with progress.?
will geographical isolation be a major factor in the speciation of a self-pollinating plant species? why or why not?
will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? why or why not?
q-what is chipko movement? How it benefit the local popultion?What is the advantage &disadvantage through this movement?please explain?
q- what is the difference between enzyme & hormone?
q-what is the largest endocrine &exocrine gland?
q-How pancrease is both an exocrine &endocrine gland?
What is artificial photosynthesis?
Give all necessary details.
How is cloning carried out?
What is in-vitro fertilisation?
What are test tube babies?
I need long and good answers.
What are allergies?
How do people get allergic to something.
THE ANSWERS TO ABOVE QUESTIONS HAVE BEEN GIVEN IN THE BLOG. PLEASE SEARCH THE SITE OR REFER TO THE RESPECTIVE CHAPTERS FOR THE ANSWERS.
REQUEST: DO NOT WRITE ANY THING THAT DOES NOT RELATE TO THE CONTENT OF THE BLOG
Importance of good handwriting in examination
Good handwriting always gives an upper hand to a student, but that doesn't mean that poor handwriting always costs. Actually what matters is writing neatly, make sure that examiner understands what you have written.
TIPS
1. Use Black pen to write title and subtitles.
2. Give diagrams wherever necessary.
3. Wherever possible use scale for writing.
4. Underline the key words.
5. Always start a new question on a new page.
6. If there is any mistake don't make it look shabby by scratching it many times; just put a line over it.
Follow the above points you’ll definitely earn 5 to 6 marks more than expected.
Madam, can we use sketch pens while Doing diagrams?
What is the differnce between involuntary action and reflex actions?
what are the functions of villi?
Name the protein soluble in blood which helps in blood clotting.
According to some books the answers are- prothrombin as well as fibrinogen.
plz correct me mam..
its really a very helpful site
there is a question- which protein in blood hepls in clotting of blood?
i think the answer is -thromboplastin.
is the answer blood platelets?
sorry...but the answer is not thromboplastin.
its either prothrombin or fibrinogen.
why there is not any electric field inside conductor?
Get your answer here.
Is pressure a scalar or a vector?
Indeed a good question Biplab. Pressure is a scalar quantity, not a vector quantity. It has a magnitude but no direction associated with it. Pressure acts in all directions at a point inside a gas for example at the surface of a gas, the pressure force acts perpendicular to the surface.
Sir,can i have some points on the irony and satire used in the lesson.."the tiger king"(class XII English vistas text.chptr 2)
ANSWER
Satire- the crown prince’s drinking of milk of English cow; watching of English movie; learning English from an English man and being brought up by English nanny. A satire on The royals who could do anything to be like the English men).
Gifting of fifty diamond rings worth three lakh rupees to the British officer’s wife to retain the kingdom. (The royals during British period used to impose tax on their ‘Praja’ and punish them for any flimsy reason; but never hesitated to stoop low before the British master’s wife to be in their good book)
Irony- the king being killed by the wooden toy-tiger (death came not from a live tiger; but from a toy tiger –and his death was not a royal death by a tiger of indomitable courage ; it was a death by a toy hardly of worth two anna)
Operation was successful; but the king was killed (after operation by the famous surgeon it was expected the king to be alright; but he died- the famous surgeon’s operation brought death to the king).
what are the main differences betwwen regeneration and fragmentation?
what is the advantage of asexual reproduction over sexual reproduction?
could you please explain the process of transportation of food in plants?
ANSWER
---------------------------------
Regeneration:Specialized cells are involved which multiplies and differentiates into tissues which gives rise to an organism.
Fragmentation:No such specialized cell is involved. Each cell can multiply and give rise to an organism as the organism is made up of one kind of cells only.
----------------------------------
Advantage of asexual reproduction over sexual:
1.Fast process.
2.Retain all the parental characteristics without any variation.
3.Single parent is involved
----------------------------------
Find here: http://students-learn.blogspot.com/2007/12/revision-questions-for-cbse.html
ques:A simple pendulum consists of a 50 cm long string connected to a 100 g ball.the ball is pulled aside so that the string makes an anle of 37 degrees with the vertical and is then released.find the tension in the string when the bob is at its lowest position.
A train overtakes two persons who are walking at a speed of 2km/hr and 4km/hr respectively in the same direction in which the train is going, the train overtakes them in 9seconds and 10seconds respectively. Find the lenght and speed of the train.
Q- Do nitrogen have allotropes?
Ncert says no but the internet says yes
Pravesh, NECRT is correct in writing that Nitrogen does not have any allotropes. However unstable allotropes N3 and N4 has been produced. So if question comes write about the unstable allotropes too.
Sir my teacher taught me & created Great Confusion about the chapter poets& panckes that;
1. Subbu was illiterate & a non brahmin
2. MRA was communist organisation
3. communist people had no feelings for their relatives and can kill family members without any hesitation
4. lawyer was a very logical person
Sir Please tell me which of the things are correct
In 9sec train covers 2km/hr x 9sec=5m.
In 10sec train covers 4km/hr x 10sec=11.1m.
So, the train travels at 11.1-5=6.1m/sec. (Do have a check for this answer)
Pravesh Good Question:
But the answer to all your queries is 'No', only 3rd query will have an answer 'Yes'.
Sir internet Also Says about Alpha & Beta allotropes of nitrogen on extreme cooling do we have to mention that also
Sir,
In Poets & Pancakes the author says that mystery was solved
What was the conclusion?
how do germ cells make a single set of genes from the normal two copies that all other cells in body have?
A normal cell has two set of chromosomes, germ cells are produced from the normal cell by reduction division(meiosis) in which the two sets of chromosomes are separated. That is how germ cells make single set of chromosome. Thanks for ques.
SIR,MY TUTION TEACHER SAID THAT VEGETARIANS ARE 1O TIMES MORE ENERGETIC THAN NON VEGIES BUT MY TEACHER SAYS IS NOY TRUE IT'S JUST THAT VEGIES HAVE A GOOD DIET. WHICH STATEMENT IS CORRECT?
08 February 2009 20:14
Sir,
In Poets & Pancakes the author says that mystery was solved
What was the conclusion?
Why do we say that activation energy cannot be zero? All the answers I have received till now direct me to the Arrhenius equation, saying that if Ea is zero, then rate will be equal to the collision factor A and as a result all collisions will lead to product formation.
But is this not compensated for by the collision theory which also takes into account the orientation? Thus even though the activation energy can be zero, the reaction would only proceed when the orientation is proper for both the reacting species.
I will wait for your opinion. Thank you!
why cant we consider evolution as a directional process?
if u think about the formation of new species and the nature's selection of a few out of them it all seems as if its directed to a particular point
S STRAIN CAN KILL MICE.............
BUT R STRAIN CANNOT................
HOWEVER THE PROTEIN COAT IS NOT RESPONSIBLE FOR THE TRANSFORMATION ( ITS THE DNA )
THEN Y THE DIFFERENCE IN S AND R STRAIN???
Show that n squared +n+1 is not divisible by 5 for any n where n is a natural number
Do only the variations that confer an advantage makes an organism survive or evolution is irrespective of that?please explain. 5marks
it is said that mercury is a dense element almost denser than iron.then why is it liquid at room temp. also the density of a substance depends on the no. of atoms and mass of atoms in a particular area.and liquids have less no. of particles in a unit area. then what is the case with mercury which being denser is a liquid. according to its place in periodic table it should have much force of attraction between its particles.
If the direction of the current is towards the south ,then what would be the direction of magnetic field ,would it be from west-east or east-west
Write 2 advantages and 2 limitations of ICs?
what are principles of electric motor& electric generator?what is use of split rings ?
HYDROGEN COMPRISES OF METALLIC & NON METALLIC PROPERTIES, then why its a non metal ?
Mercury-mercury bonding is very weak because its valence electrons are not shared readily. (In fact mercury is the only metal that doesn't form diatomic molecules in the gas phase).
Laboratory tests have found that an electrical discharge causes the noble gases to combine with mercury vapor. These compounds are held together with van der Waals forces and result in Hg·Ne, Hg·Ar, Hg·Kr, and Hg·Xe as mostly Hg reacts as noble gasMercury is the only metal liquid at standard conditions for temperature and pressure, with a melting point of −38.83°C. Its boiling point of 356.73°C gives it one of the narrowest liquid ranges of any metal.
Why is human sex ratio 1:1
hi can u give me one mark question for CBSE 10th for biology chapters alone.. with answers. If multiple choice it will be help for me.
Miziriya, the questions have been provided on the right side bar of the site. Also MCQs are present over there. Use 1024X768 resolution for better view.
what is the cause of low blood pressure?
Causes of low blood Pressure:
http://www.mayoclinic.com/health/low-blood-pressure/DS00590/METHOD=print&DSECTION=all
i like your service.
what do you mean by fermentation?
Thanks Manbir: Here is the answer
Fermentation is an anaerobic process of decomposition of carbohydrate by some microbes like yeast producing Ethyl alcohol and carbon-dioxide. Ex:formation of dough while preparing bread,idli,dosa.
What are requirements for private candidates who is repeating 12 class?
what is the definition of mutation
Mutations are changes to the nucleotide sequence of the genetic material of an organism. Mutations can be caused by copying errors in the genetic material during cell division, by exposure to ultraviolet or ionizing radiation, chemical mutagens, or viruses.
Q:Why is salt bridge not used in batteries?
Why there is a symptom of photophobia in a person suffering frm disease chikungunya?
why lower organisms reproduce sexually during unfavourable period?
wht can we call parthenogenesis-sexual or asexual mode of reproduction? and why?
why is liver palpable in a person suffering from Dengue Haemorrhagic Fever?
class12 English core -In the story The Rattrap who is Nils Olof? The rattrap peddler is mistook as Captain Von Stahle. then who is Nils Olof?
The HOTS Question(English Medium)in SSC has been damaged,please check over it within a quick time.
To download files right click the link and click 'save link as' and then press save button.
What are the 3 types of phloem tissues in plants?
Q.What colour changes would you observe when methyl orange is mixed with an acid?
Aditi,
There are two types of phloem tissues-Primary and Secondary. Secondary phloem grows during secondary growth.
whatare the four demerit of democracy
Demerits of Democracy:
1) The tyranny of the majority
2) Slow to act
3) Hard to maintain
4) Requires a lot of citizen participation
what are cocervates?
ANSWER THE FOLLOWING QUES
(1)which is the most electronegative
element in the periodic table
(2)which is the most electropositive element in the p.table
(3)how melting &boiling point differ down the group and across the period
(4)what is the difference between pH paper and universal indicator
1.Fluorine
2.Cesium
3.See book
4. http://in.answers.yahoo.com/question/index?qid=20070123012059AAZLwtt
distinguish between oxidation and combustion
Q.1.Briefly explain the circulation of blood in kidney
Q.2.how are reproduction and heredity interlinked
Q.3.How is small intestine designed to absorb digested food
Q.4.How is alveoli designed to maximize the exchange of gases
Q.5.Justify why the male reproductive system is called the ureinogenital system
what are enzymes
will an electric bulb glow brigher or fainter in a parallel connection than series connection?
Will agregate grade be given in cbse marksheet./...........plzzzzzz telll mmmmmmmmeeeeeeee
do u have MCQs based on practicals for physics and chemistry also in this site
Hello,
Kindly let me know the website which will enable me to get Q/A from the question bank for std IX & x [cbse] for Biology.
Thank you,
Saradha Sekhar.
more material for english core 12th
is there any reference guide for class 12th english
the cbse 12th ncert maths textbook is not opening please answer me fast
CBSE-XII MATH TEXT BOOK
Try this link...
http://ncertbooks.prashanthellina.com/12_Mathematics.html
the cbse 11th maths book is not opening and i think there is an error please answer quick and i want exact life span of elephant ,rose ,dog ,banana tree,cow ,horse ,fruit fly ,rice plant ,banyan tree,parrot
is reading 11th cbse book is necessary for 12th or i just start 12th textbook and mbd
does the questions given at end of chapter comes in board exam
or reading extra questions are required
please provide me 11th ncert cbse book and notes on the chapter ofcbse 12th environmental issues and provide me questions on environmental issues asked in board exams only
The ncert books are perfectly opening. Few recommendations: 1.Use latest browser (chrome)2.Scroll down to see chapterwise links 3. Right click the links and the click "save as" and save it to your hard disk.
For class XII boards reading class XII ncert books will be more than sufficient. First go through them thoroughly and then switch to reference books for extra questions.
i am a 12th std student.my subjects are biology,chemistry,physics, informatics practices, English.....
i would like to write private maths exam.... i am intrested in bio chemical engineering...so maths is compulsory....
so can you please tell me the procedures for writting private maths exam???????
@meghasreeram
If you have taken Mathematics in class XI, then you can take Maths as 6th Subject during the board exam form fill up.
my daughter was having state board in 11th and she secured 70 percent but now she is facing problem with state board syllabus and sanskrit and now she wants to take cbse in 12th as she was having cbse in 10th with 80 per cent she is aware of cbse syllabus and wants to take cbse she is ready with her studies only admission problem is coming and most of schools are saying no because of the state board in 11th avoiding her marks and knowledge so is there a rule that if a student is taking state board in 11th so the board cannot be transfered in 12th cbse please let me know it fast because there is much less time and also suggest some schools that can give her admission if the transfer of board is accepted because schools are starting from 26th june
Nice fill someone in on and this fill someone in on helped me alot in my college assignement. Say thank you you as your information.
i need answers related to vistas
Get answers related to vistas here: http://students-learn.blogspot.com/2007/11/vista.html
when the tRNA called sRNA?
when is the tRNA called tRNA?
@avipsa Other than in translation process tRNA is called sRNA.
please tell me how 2 score 100 in every subject?
is the syllabus and marks of 1st and 2nd term be different?
class 10....
trignometry
Wat is the schedule for summative exam 1 for class 9?
If u know that Please tell it guys
its very good for students
thanks
Can we two different color pens in cbse board exams ???
hhhhhiiiiiiiiiiiiiiiiiii bbbbuuuudddddddddddiiiiiiiiiieeeessss
i want to learn organic chemistry but i am not know more about organic chemistry.i am in 12th class....also time is very less(only two months)......please TELL.
can you please upload a list of important essay topics for english?
can you upload a list of important essay topics for english?
plz..... tell me some MCQ'S
1.) normal temperature of human body
a)90F (b)98F (C)98.4F (D)96.4F
2.)the blood pressure is the pressure in
a)arteries b)veins c)auricles d)ventricles
3.)total no. of bones in human skull is
a)8 b)12 c)30 d)32
4.)what is funny bone
a)a muscle b)a nerve c)a bone
d)a blood vessel
5.)a normal blood pressure in human body is
a)90/60 c)160/120
c)120/80 d)140/100
plz..... tell me some MCQ'S
1.) normal temperature of human body
a)90F (b)98F (C)98.4F (D)96.4F
2.)the blood pressure is the pressure in
a)arteries b)veins c)auricles d)ventricles
3.)total no. of bones in human skull is
a)8 b)12 c)30 d)32
4.)what is funny bone
a)a muscle b)a nerve c)a bone
d)a blood vessel
5.)a normal blood pressure in human body is
a)90/60 c)160/120
c)120/80 d)140/100
I AM UNABLE TO LEARN HISTORY FOR CLASS XII BOARD. PL TELL ME IMPORTANT QUESTIONS AND CHAPTERWISE WEIGTHAGE
please tell important questions for history for class xii. I am unable to prepare. pl help me.
q-give me a short summary of poem ''a roadside stand''
how can V define polygeny, euploidy?
what are retroviruses?
what are the number of chromosomes of garden pea?
what is a oxidation number
what is cross breeding
Please add revision notes of plus one biology,chemistry and of plus two science subjects
Its seriously Dumb .....!! no use of it ...<3
How can I download the ppt? I like it.
How can I download the ppt? I really liked it.
Thanks a ton! I got to download it.
can u send me a link of solution ebook for the NCERT book CLASS IX
please send it to
kushashwaravishrimali@gmail.com
q- what is heptal portal system?
q- what is heptal portal system?
how to prepare for physics xii board exam?
hw to prepare for physics xii board exam?
how an earthquake formed.
how are earthquake formed.
can i get class 7 answers sheet !!
science notes of all chapters of class viii
FIND THE TOTAL NUMBERS OF WAYS IN WHICH SIGN'+' CAN BE ARRANGED IN A LINE SUCH THAT NO TWO '-' SIGN OCCUR TOGETHER
english core for class xi and xii- 2012,2013 will get conventional questions or multiple choice question in the new pattern of cl x
nic
is cbse exams r preponed????
plz rply soon.....
Is there an intersection of time and space in the story "The Third Level" from Vistas?
In getting education the student face many problems in acquiring education.Student has get his destination point easily.
Thanks...
regards, saad from
Education
WHAT IS THE PUREST FORM OF WATER?
how to find out the direction of induced current if a bar magnet facing south pole is brought in the side of the coil?
about garghoritian family
thnx
thnx
Can you please upload the best summery of the poem A Thing of Beauty by John Keats
In 'third level' what does he mean by saying that the grand central subway HAS BEEN an exit for many of the people.....
plz answer the ques .,,,justify the title "lost spring"?
ques- (P+a/v^2)(b-v)=RT
P=Pressure,v=velocity.T=kelvin unit of temperature. find the dimensions of a and b.
i want the solution step by step...it is given in my book but i cannot understand the process as they didnot show any steps.
State the order in which the claims against a firm under dissolution are settled.
please answer regarding to the syllabus of class 12
This discussion is really very nice and very informative. Now do not have any doubt.
Top Mat Colleges in Delhi
please answer the query that abot the mclerry character in evans tries an o level
great site
great site
Q.why does charley say"he certainly can't go back to his old business?
will cbse give grace mrks in physics Class 12?? If yes than how many marks.. plz reply soon
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