Write down four characters of mammals. Give two examples.
Write down four characters of mammals. Give two examples.
Example: Human beings and Monkey.
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Explain the objectives of mixed cropping. How are crops selected for mixed cropping.
Write down four characters of Chondrichthyes. Give two examples.
“Prevention of disease is more desirable than its treatment”. Justify the statement by discussing three major strategies to be adopted for the prevention of infectious diseases.

Why does dehydration set in during diarrhoea? How can the former be prevented.
What is ozone shield? How is it being corroded?
Distinguish between polyp and medusa.
What is division of labour? Explain it in context of multicellular organisms.
Define soil erosion? Describe causes of soil erosion.