Which of the following characteristics is common to Amoeba and Paramecium?
Oral groove
Trichocyst
Contractile vacuole
Cilia
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements is TRUE of inhalation of air by man?
The ribs are not raised
Diaphragm is raised
Intercostal muscles relax
Pressure of the thoracic cavity increase
Size of thoracic cavity increase
Correct answer is E
No explanation has been provided for this answer.
Viruses are considered to be living organisms because they
possess transmittable characters
move from one place to another
respond to stimulation
ingest food materials
Correct answer is A
No explanation has been provided for this answer.
Farmers practise crop rotation because it
helps to prevent soil erosion
allows two crops to be planted at the same time
helps to conserve soil fertility
is an alternate to shifting cultivation
Correct answer is C
Crop rotation is a practice used to maintain nutrients in an agricultural soil.
Most irrigated lands often become unproductive in later years because of
loss of fertility
increase in salinity
soil erosion
loss of water
Correct answer is C
Disadvantages of irrigation:
- Excess water in the soil leads to waterlogging