| Class XII |
Biology |
Biology |
13 |
a study of the history of life on earth through fossil records, we learn that large-scale loss of species like the one we are currently witnessing ... |
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| Class XII |
Biology |
Biology |
13 |
probably millions of species is being cut and cleared for cultivating soyabeansor for conversion to grasslands for raising beef cattle. Besides tot... |
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| Class XII |
Biology |
Biology |
13 |
extinction of the other. 13.2 B IODIVERSITY C ONSERVATION 13.2.1 Why Should We Conserve Biodiversity? There are many reasons, some obvious and othe... |
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| Class XII |
Biology |
Biology |
13 |
bulbul’s song in the morning. Can we put a price tag on such things? The ethical argument for conserving biodiversity relates to what we owe to mil... |
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| Class XII |
Biology |
Biology |
13 |
regions. Although all the biodiversity hotspots put together cover less than 2 per cent of the earth’s land area, the number of species they collec... |
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| Class XII |
Biology |
Biology |
13 |
and its conservation is therefore a collective responsibility of all nations. The historic Convention on Biological Diversity (‘The Earth Summit’) ... |
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| Class XII |
Biology |
Biology |
13 |
that communities with high diversity tend to be less variable, more productive and more resistant to biological invasions. Earth’s fossil history r... |
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| Class XII |
Biology |
Biology |
3 |
CHAPTER 3 REPRODUCTIVE HEALTH 3.1 Reproductive Health – Problems and Strategies 3.2 Population Explosion and You have learnt about human reproducti... |
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| Class XII |
Biology |
Biology |
3 |
in schools should also be encouraged to provide right information to the young so as to discourage children from believing in myths and having misc... |
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| Class XII |
Biology |
Biology |
3 |
of the foetus. Research on various reproduction-related areas are encouraged and supported by governmental and non-governmental agencies to find ou... |
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| Class XII |
Biology |
Biology |
3 |
Therefore, the government was forced to take up serious measures to check this population growth rate. Themostimportantsteptoovercomethisproblemist... |
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| Class XII |
Biology |
Biology |
3 |
breast-feeds the child fully, chances of conception are almost nil. However, this method has been reported to be effective only upto a maximum peri... |
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| Class XII |
Biology |
Biology |
3 |
within the uterus and the Cu ions released suppress sperm motility and thefertilisingcapacityofsperms.ThehormonereleasingIUDs,inaddition, Reprint 2... |
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| Class XII |
Biology |
Biology |
3 |
The Medical Termination of Pregnancy preventconception.Sterilisationprocedureinthemaleiscalled‘vasectomy’ (Amendment) Act, 2017 and that in the fem... |
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| Class XII |
Biology |
Biology |
3 |
termination of pregnancy before full term is called the pregnancy would medical termination of pregnancy (MTP) or induced abortion. Nearly involve ... |
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| Class XII |
Biology |
Biology |
3 |
the risk factors involved in illegal abortions aswellasprovidingmorehealthcarefacilitiescouldreversethementioned unhealthy trend. 3.4 S EXUALLY T R... |
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| Class XII |
Biology |
Biology |
3 |
following the simple principles given below: (i) Avoid sex with unknown partners/multiple partners. (ii) Always try to use condoms during coitus. (... |
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| Class XII |
Biology |
Biology |
3 |
is another method attempted. Intra cytoplasmic sperm injection(ICSI)isanotherspecialisedproceduretoformanembryo in the laboratory in which a sperm ... |
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| Class XII |
Biology |
Biology |
3 |
Child Health Care programmes. An overall improvement in reproductive health has taken place in our country as indicated by reduced maternal and inf... |
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| Class XII |
Biology |
Biology |
3 |
in schools? Why? 4. Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of impr... |
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| Class XII |
Biology |
Biology |
4 |
Chapter 4 The work of Mendel and others who followed him gave us an Principles of Inheritance ideaofinheritancepatterns.Howeverthenatureofthose‘fac... |
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| Class XII |
Biology |
Biology |
4 |
with J. D. Watson, then a young man of 23, leading in 1953 to the proposal of the double-helical structure for DNA and the replication scheme. Cric... |
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| Class XII |
Biology |
Biology |
4 |
wild cows, we have well-known Indian breeds, e.g., Sahiwal cows in Punjab. We must, however, recognise that though our ancestors knew about the inh... |
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| Class XII |
Biology |
Biology |
4 |
Reprint 2026-27 PRINCIPLES OF INHERITANCE AND VARIATION Table 4.1: Contrasting Traits Studied by Mendel in Pea S.No. Characters Contrasting Traits ... |
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| Class XII |
Computer Science |
Computer Science |
9 |
Nachaobi | | 109 | Daribha | | 110 | Tanya | +-------+----------+ 10 rows in set (0.00 sec) (B) Renaming of columns In case we want to rename any c... |
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