To avoid over fishing in a lake, the following measures may be helpful except
limiting fishing periods
regulating the size of nets
fishing throughout the year
fish breeding exercise
Correct answer is C
No explanation has been provided for this answer.
Many diseases caused by bacteria can be treated and cured by using
antiseptics
antibiotics
antigens
antibodies
Correct answer is B
No explanation has been provided for this answer.
Which of the following statements about nitrogen is not correct? Nitrogen is needed for
protein synthesis
activating certain enzymes
the synthesis of chlorophyll
healthy vegetative growth of plants
Correct answer is B
No explanation has been provided for this answer.
Which of the following activities constitutes biological control?
A small bony fish transported on the back of a shark
Adding manure to crops in a garden
Tilapia feeding on the larvae and pupae of mosquito
A vulture feeding on the carcass of a goat
Correct answer is C
No explanation has been provided for this answer.
Which of the following groups consists of only micro-nutrients?
Molybdenum, sulphur and copper
Boron, Zinc and Calcium
Manganese, molybdenum and zinc
Magnesium, phosphorus and manganese
Correct answer is C
No explanation has been provided for this answer.