题目内容

23. Neodumetia sangawani ate

A forage grass
B rice fields
C coconut trees
D fruit trees
E water hyacinth
F parthenium weed
G Brazilian beetles
H grass-scale insects
I larval parasites

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22. Disapene scale insects feed on

A forage grass
B rice fields
C coconut trees
D fruit trees
E water hyacinth
F parthenium weed
G Brazilian beetles
H grass-scale insects
I larval parasites

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21. Bio-control is free from danger under certain circumstances.

A. YES
B. NO
C. NOT GIVEN

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20. Biological control entails using synthetic chemicals to try and change the genetic make-up of the pests' offspring.

A. NO
B. NO
C. NOT GIVEN

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19. A number of pests are now born with an innate immunity to some pesticides.

A. YES
B. NO
C. NOT GIVEN

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23. Neodumetia sangawani ate

A forage grass B rice fields C coconut trees D fruit trees E water hyacinth F parthenium weed G Brazilian beetles H grass-scale insects I larval parasites

22. Disapene scale insects feed on

21. Bio-control is free from danger under certain circumstances.

20. Biological control entails using synthetic chemicals to try and change the genetic make-up of the pests' offspring.

19. A number of pests are now born with an innate immunity to some pesticides.

A forage grass
B rice fields
C coconut trees
D fruit trees
E water hyacinth
F parthenium weed
G Brazilian beetles
H grass-scale insects
I larval parasites