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  9. Q40
Question 40

Dissolved oxygen in fish ponds is maintained at normal level in order to

  • A.accelerate decay of plant materials
  • B.prevent disease attacks
  • C.prevent acquatic plants from competing with fish
  • D.keep fish activities normal
  • E.improve the quality of fish
Objective

Question details

Exam body
WAEC
Subject
Agricultural Science
Year
1990
Question no.
#40
Type
Objective
Previous · Q39Which of the following livestock diseases is transmitted by ticks? Next · Q41 Which of the following is not a quality for selecting livestock?

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