Which of the following substance is an ore of iron?
Bauxite
Cassiterite
Haematite
Steel
Correct answer is C
No explanation has been provided for this answer.
Which of the following plants is not a pasture grass?
Pennisetum purpureum
Axonopus compressus
Stylosanthes gracilis
Panicum maximum
Correct answer is C
No explanation has been provided for this answer.
Greenhouse effect can be reduced by controlling
water evaporation
burning wood and fossil fuel
the use of aerosols
the use of artificial fertilizers
Correct answer is B
No explanation has been provided for this answer.
What is CaHb in the following equation? C a
H b + 5O2 → 3CO 2 + 4H2O
C 3H4
C3H6
C3H8
C 5H 10
Correct answer is C
No explanation has been provided for this answer.
Thinning is a farm operation in which
Empty spaces where seeds did not germinate are replanted
The number of seedlings per stand is reduced to one or two
Fertilizers and manures are applied to crops
Effort is made to control pests
Correct answer is B
No explanation has been provided for this answer.