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Why should preventive measures and biolo...

Why should preventive measures and biological control methods be preferred for protecting crops ?

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Preventive measures (such as use of resistant varieties) and biological control methods should be preferred for protection of crops because they are ecologically safe, target specific and harmless to other life forms.
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PRADEEP-IMPROVEMENT IN FOOD RESOURCES -Model Test Paper
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  2. How can we produce a transgenic plant ?

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  3. What are fossil fuels ? Give one example.

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  5. How do organisms contribute in the fomation of soil?

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  6. Name one chronic disease that is associated with respiratory system. H...

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  7. Name any three modes of transmission of AIDS.

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  8. What is vaccination ? Who gave this idea ?

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  9. (a) Expand abbreviation CFCs. Where are these commercially used ? (...

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  10. How would you differentiate between : (i) Mixed cropping and Inter...

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  11. What is smog ? Give its harmful effects.

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  12. Blue green algae are classified along with bacteria placed in Kingdom-...

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  13. Give symptoms and control of diarrhoea infection.

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  14. Give the structure, occurrence and function of the following : (i) ...

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  15. Name two fishes each which live in the (i) surface zone (ii) middle zo...

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  16. (i) List atleast three categories of animal connective tissues. (ii)...

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  17. (i) List atleast three special types of parenchyma. (ii) Different...

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  18. Write briefly the affinities of hemichordates with echinoderms.

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  19. Draw a labelled diagram of a plant cell as revealed by an electron mic...

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  20. Very briefly describe the following : (i) Lysosomes are autophagous ...

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  21. (i) What scientific name is given to bee keeping ? (ii) What is the i...

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