Origirl of human probably occurred in central Asia.
Which of the following statements may be a reason for this ?
I. Asia is rich in domesticated animals and plants.
II. Climatic conditons of Asian places were most favourable for human evolution.
III. The oldest known fossils have been originated from Asia.
IV. Human fossils are found only at these places.

Which of the following statements describe natural extinction ? (i) Extinctions abetted by human activities (ii) Slow replacement of existing species (iii) Also known as background extinction (iv) A small population is most likely to be extinct

Which of the following statements describe natural extinction? (i) Extinctions abetted by human activities (ii) Slow replacement of existing species (iii) Also known as background extinction (iv) A small population is most likely to be extinct

Assertion: Human evolution occurred in Asia and Africa. Reason: The earliest fossils of the prehistoric man have been found from the late Miocene of Shivalik hills in India.

Which of the following statement/s regarding deforestation is/are wrong? I. Deforestation is the conversion of forested areas to non-forested ones. II. A number of human activitis contribute to deforestation. III. Deforestation increases biodiversity due to habitat conservation. IV. One of the major reasons is the conversion of forest to agricultural land so as to feed the grwoing human population. V. Almost 40 per cent forests have been lost in the tropics, compared to only 1 per cent in the temperate region.

How many of the following statements are CORRECT ? I. India is one of the 12 megadiversity countries of the world. II. India has only 8.1 percent of the worl's land area. III. Nearly 45,000 species of animals and twice as many as plants have been recorded from lndia. IV. According to May's global estimates , only 22 percent of the total species have been recorded so far. v. Nature's biological the library is burning even before we catalogued the titles of all books stocked there.

How many of the following statements are CORRECT ? I. India is one of the 12 megadiversity countries of the world. II. India has only 8.1 percent of the worl's land area. III. Nearly 45,000 species of animals and twice as many as plants have been recorded from lndia. IV. According to May's global estimates , only 22 percent of the total species have been recorded so far. v. Nature's biological the library is burning even before we catalogued the titles of all books stocked there.

Refer to the given figures P, Q, R and S. Which of the following statements are correct regarding them? P is the mould from which penicillin is made. (ii) Ris considered as connecting link between plants and animals. (iii) Q and S are parasites which live in the bodies of other organisms including human beings. (iv) R and S bear chlorophyll and prepare food in the presence of sunlight. (v) S is colonial form of algae.

The most serious water pollutants are the disease causing agents called pathogens. Which of the following statements is/are true ? I. Pathogens include bacteria and other organisms that enter water from domestic sewage and animal excreta. II. Human excreta contain bacteria such as Escherichia coli and Streptococcus faecalis which cause gastrointestinal diseases.