Angiosperms and gymnosperms belong to the plant group known as
schizophyta
bryophyta
pteridophyta
spermatophyta
Correct answer is D
No explanation has been provided for this answer.
Free nitrogen is released to the atmosphere by
Nitrogen-fixing bacteria
nitrifying bacteria
denitrifying bacteria
saprophytic bacteria
Correct answer is C
No explanation has been provided for this answer.
What do bacteria in root nodules derive from the host plant?
Protection and minerals
Water and minerals
Carbonhydrates and water
Protection and carbohydrates
Correct answer is A
No explanation has been provided for this answer.
An acidic soil can be improved upon by
sedimentation
leaching
flocculation
watering
Correct answer is C
No explanation has been provided for this answer.
Which of the following constitute pollution?
Droppings from birds
loud disco sound
A pack of cigarettes
Refuse in an incinerator
Correct answer is B
No explanation has been provided for this answer.